Assessing the carbon sink potential of marine aquaculture is critical to fostering sustainable marine economic development and achieving carbon neutrality.This study evaluates the carbon sink potential of four nearsho...Assessing the carbon sink potential of marine aquaculture is critical to fostering sustainable marine economic development and achieving carbon neutrality.This study evaluates the carbon sink potential of four nearshore aquaculture systems in China:floating raft,net cage,pond,and tidal flat.China’s coastal aquaculture shows a dramatic potential range from−5401.28×10^(4)t to 84.65×10^(4)t,acting as both a carbon sink and a source.Floating raft(11.19×10^(4)t to 105.65×10^(4)t)and tidal flat(42.83×10^(4)t to 114.35×10^(4)t)are net carbon sinks.In contrast,net cage(−427.39×10^(4)t to−4.26×10^(4)t)and pond(−5027.91×10^(4)t to−131.09×10^(4)t)are significant net carbon sources.This heterogeneity is driven by differences in species,feed inputs,energy consumption,and management practices.The results highlight the need for targeted low-carbon technologies in high-emission systems to maximize carbon sequestration and mitigate their environmental impacts.This study provides a scientific basis for optimizing carbon management and offers insights for global sustainable aquaculture and carbon neutrality.展开更多
Asian seabass(Lates calcarifer)is becoming an important species for aquaculture.However,the Asian seabass aquaculture industry faces a significant challenge of disease outbreaks that can jeopardize fish health and pro...Asian seabass(Lates calcarifer)is becoming an important species for aquaculture.However,the Asian seabass aquaculture industry faces a significant challenge of disease outbreaks that can jeopardize fish health and production.This review delves into the major diseases affecting Asian seabass aquaculture and explores their causes,symptoms,and management approaches.We focused on the key pathogens responsible for these outbreaks,the environmental factors contributing to disease susceptibility,and the latest advancements in disease prevention and management.By addressing these critical aspects,this review addresses the needs of aquaculturists,researchers,and policymakers with the knowledge required to promote resilient and sustainable Asian seabass farming.We aim to shed light on the challenges posed by disease while highlighting innovative strategies that offer promise for the future of this thriving industry.This comprehensive examination serves as a valuable resource for those invested in ensuring the health and vitality of Asian seabass,securing a consistent supply to meet the demands of global seafood markets.展开更多
Fresh fish was the best-selling product in Xitun Supermarket in Nyingchi City,the Xizang Autonomous Region,in the second half of 2024."They were really fresh and usually sold out within half an hour,"He Mei,...Fresh fish was the best-selling product in Xitun Supermarket in Nyingchi City,the Xizang Autonomous Region,in the second half of 2024."They were really fresh and usually sold out within half an hour,"He Mei,manager of the supermarket,said.The fish were raised by a local aquaculture farm,Nyingchi Statefarm Karma Agriculture Co.Ltd.(NSKA).展开更多
[Objectives]To assess the carbon sink capacity in seawater suspension cage aquaculture of shellfish in Tianjin from 2015 to 2022.[Methods]The carbon sink capacity of different shellfish species was evaluated using bot...[Objectives]To assess the carbon sink capacity in seawater suspension cage aquaculture of shellfish in Tianjin from 2015 to 2022.[Methods]The carbon sink capacity of different shellfish species was evaluated using both physical and value assessment methods.[Results]The shellfish cultivated in seawater suspension cages in Tianjin exhibited a significant capacity for carbon sinks.The amounts of carbon removed by suspension cage aquaculture of Rapana venosa,Crassostrea gigas,Scapharca subcrenata,Scapharca broughtonii and Argopectens irradias were 448.297,403.398,89.463,40.657,and 106.719 t,respectively.Furthermore,the total volume of shellfish cultivated in seawater exhibited a consistent upward trend over time,correlating with an annual increase in the amount of carbon removed.Among the shellfish cultivated in seawater suspension cages,the order of carbon sink capacity was as follows:C.gigas>R.venosa>A.irradias>S.subcrenata and S.broughtonii.In terms of the carbon sink capacity of soft tissues,the ranking was as follows:A.irradias>R.venosa>C.gigas>S.subcrenata and S.broughtonii.The structural and yield factors associated with seawater suspension cage aquaculture of shellfish significantly influenced the enhancement of the total carbon sink of cultivated shellfish.Notably,structural factors had a greater impact on the increase in the carbon sink of cultivated shellfish compared to total yield factors.[Conclusions]The findings will serve as a reference for enhancing the carbon sink potential of fisheries and achieving sustainable development in seawater aquaculture in Tianjin.展开更多
This study explores the combination of ultrasound technology with a detection algorithm to categorize flow regimes in bubble columns used for aeration in aquaculture.An ultrasonic velocity profiler is used to obtain t...This study explores the combination of ultrasound technology with a detection algorithm to categorize flow regimes in bubble columns used for aeration in aquaculture.An ultrasonic velocity profiler is used to obtain the standard deviation of the bubble velocity distributed throughout the column.The bubble velocity data for three known flow regimes were used to develop a probability density function(PDF)classification model.The experimental apparatus consisted of a circular tank equipped with a bubble generator and gas hold-up monitoring systems.The flow regimes of the experimental fluid were determined,and the classification was conducted via the PDF method.The results demonstrate that the classification accuracy is not lower than that of traditional machine learning methods.展开更多
Evaluating species composition and dynamic shifts within fouling communities is essential for developing effective strate-gies to manage biofouling in marine fish aquaculture.The coastal area in the Yellow Sea is a ke...Evaluating species composition and dynamic shifts within fouling communities is essential for developing effective strate-gies to manage biofouling in marine fish aquaculture.The coastal area in the Yellow Sea is a key area for cage aquaculture in China;however,this region faces significant challenges from biofouling organisms.Here,we employed an experimental approach in a filed mesocosm in a net cage aquaculture area in the Yellow Sea,with weekly monitoring of changes in macrofouling species on mesh nets and in the seawater,to assess the utility of water eDNA metabarcoding for identifying macrofoulers.We compared the temporal variation patterns in the composition and diversity of macrofouling communities identified through morphological method as well as COI and 18S rRNA metabarcoding.The results showed that metabarcoding detected the majority of macrofoulers identified through morphological method(64%),and revealed additional species that were overlooked by traditional monitoring approach.Furthermore,the changes in diversity and community composition over sampling dates in COI data were generally consistent with those in morphological identification,although a temporal lag existed between these two approaches.A notable shift in the fouling community occurred at the end of June with the appearance of Ectopleura crocea and Caprella sp.,marking a pivotal change in its structure.Future research could focus on developing targeted primers for these key fouling species,which would enhance the efficiency of monitoring efforts.展开更多
Oyster aquaculture farm(OAF)with dense wooden stakes,one of the prevalent large-scale marine culture facilities in estuaries,has the potential to influence estuarine hydrodynamics,sediment dynamics,geomorphological ev...Oyster aquaculture farm(OAF)with dense wooden stakes,one of the prevalent large-scale marine culture facilities in estuaries,has the potential to influence estuarine hydrodynamics,sediment dynamics,geomorphological evolution,and sustainable development.This study investigated these impacts in the Moyang River Estuary(Guangdong Province,China)by combining a two-dimentional coupled current-wave-sediment numerical model with field observations based on the TELEMAC-MASCARET numerical simulation system.The wooden stakes of OAF were represented as rigid cylinders in the model,and key parameters were calibrated through field observations,including stake diameter(0.1 m),spacing(3 m),height(6 m),and drag coefficient.Simulations comparing scenarios with and without OAF quantified the responses of sediment dynamics to estuarine OAF.Tidal currents in the channel were strengthened,with velocity increased by 20%-70%,while currents within the OAF weakened,with the maximum reduction exceeding 0.45 m/s.Significant wave height rapidly attenuated within OAF,with the wave attenuation coefficient exceeding 50%.Concurrently,due to the effects of stronger ebb dynamics caused by OAF,sediments in the channel were eroded,inducing a larger rate of seaward residual transport over a tidal cycle.Additionally,more sediments in the middle bar were resuspended,promoting the formation of a high-concentration zone of suspended sediment(estuarine turbidity maximum)during the ebb period.These changes in sediment dynamics caused by OAF significantly influenced the geomorphological evolution of the mouth bar,driving seaward channel extension and deepening,while causing progressive vertical accretion and lateral expansion in the top and outer slope of the middle bar.Sediment resuspension and redistribution within the mouth bar facilitated net transport and redeposition along the OAF periphery.Furthermore,it is crucial to appropriately increase the stakes spacing in the management of oyster farms to ensure a stable flow of water within the OAF.These findings provide a transferable framework for investigating sediment dynamics and a scientific basis for evaluating marine aquaculture practices in other estuaries with OAF or similar anthropogenic structures worldwide.展开更多
The development and utilization of marine resources by human beings is gradually moving towards the deep sea,and deep-sea aquaculture platforms have emerged to meet the needs of aquaculture and food security.To better...The development and utilization of marine resources by human beings is gradually moving towards the deep sea,and deep-sea aquaculture platforms have emerged to meet the needs of aquaculture and food security.To better understand the motion response characteristics of the main structure of the full-submersible deep-sea aquaculture platform under the action of water waves,Fluent software is used to numerically simulate regular waves,irregular waves,and strong nonlinear waves,and their effects on the six degrees of freedom motion response of the main structure of the full-submersible deep-sea aquaculture platform are analyzed.The study found that under the towing condition,the smaller the wave direction angle,the more intense the movement.Under the platform’s working conditions,the larger the wave direction angle,the more intense the movement.展开更多
Heavy metal pollution in coastal waters is on the rise,presenting serious threats to both ecosystems and human health.Coastal aquaculture zones,such as those in Quang Ninh province,are especially vulnerable due to the...Heavy metal pollution in coastal waters is on the rise,presenting serious threats to both ecosystems and human health.Coastal aquaculture zones,such as those in Quang Ninh province,are especially vulnerable due to the accumulation of heavy metals from multiple sources,including industrial wastewater,land runoff,and maritime activities.This study applies the Heavy Metal Pollution Index(HPI)to assess pollution levels based on the concentrations of nine heavy metals(Cr,Mn,Fe,Cu,Zn,As,Cd,Hg,Pb)found in seawater samples collected from coastal aquaculture areas in Quang Ninh.According to the HPI method,values exceeding 100 indicate polluted water,serving as a benchmark for evaluating heavy metal contamination in the region.A total of 25 seawater samples were collected and analyzed;of these,18 samples(72%)had HPI values above 100,signaling a concerning level of heavy metal pollution,while only 7 samples(28%)fell below the threshold,suggesting no significant contamination.These results underscore the urgent need for enhanced monitoring of water quality and stricter regulation of pollution sources to protect both environmental and public health.展开更多
This study explores the status,challenges,and opportunities of smallholder aquaculture in the Leyte Sab-a Basin Peatland(LSBP),with a particular focus on the application of Nature-Based Solutions(NbS)for sustainable m...This study explores the status,challenges,and opportunities of smallholder aquaculture in the Leyte Sab-a Basin Peatland(LSBP),with a particular focus on the application of Nature-Based Solutions(NbS)for sustainable management.Using a mixed-methods approach that combines a comprehensive literature review with a focus group discussion(FGD)involving 22 local practitioners,the study identifies both traditional practices-such as bamboo pond structures and the use of Kangkong(Ipomoea aquatica)and Azolla as fish feed-and key constraints to productivity.These include environmental vulnerabilities(e.g.,declining water quality,climate variability),technical limitations(e.g.,disease risks,lack of fingerlings),and socio-economic barriers(e.g.,limited market access,financial insecurity,and gender inequality).While most smallholders are unfamiliar with formal NbS frameworks,their current practices already reflect ecological principles aligned with NbS.The study further highlights the socio-economic significance of aquaculture as both a livelihood resource and a contributor to food security in rural peatland communities.Linking traditional knowledge with scientifically guided NbS-such as Integrated Multi-Trophic Aquaculture(IMTA),aquaponics,and biofiltration systems-can enhance ecosystem resilience and livelihood security.In addition,strengthening gender-inclusive participation and providing equitable access to training and financial support are critical to improving resilience.This study concludes that targeted capacity-building,financial support mechanisms,and multi-stakeholder partnerships are needed to facilitate inclusive,sustainable,and climate-resilient aquaculture systems in peatland environments.Beyond addressing immediate livelihood changes,these strategies also contribute to biodiversity conservation,ecosystem restoration,and climate adaptation in fragile wetland landscapes.展开更多
The establishment of water circulation aquaculture system realized the hi- erarchical use of nitrogen, phosphorus and other eutrophic substances in aquaculture wastewater and the recirculation use of water resource. H...The establishment of water circulation aquaculture system realized the hi- erarchical use of nitrogen, phosphorus and other eutrophic substances in aquaculture wastewater and the recirculation use of water resource. However, no research has been reported on the detailed calculation of the relationship between the area of aquaculture pond and purification pond. In this study, referring to the absorption ability of aquatic plants to pollutants in aquaculture wastewater and pollutant generation and discharge coefficient in aquaculture pond, based on the general rules of water quality management in freshwater aquaculture system, a calculation mode was es- tablished to investigate the relationship between the area of aquaculture pond and purification pond in freshwater recirculation aquaculture system, which was feasible to explain related cases and would provide theoretical basis to reduce the economic costs in the construction of water circulation aquaculture system and realize the bal- ance between the ecological benefits and the economic benefits.展开更多
[Objective] The aim was to establish the water quality evaluation index system for freshwater aquaculture pond.[Method] The expert survey,DELPHI,field research and other methods were used.Based on the analysis of fact...[Objective] The aim was to establish the water quality evaluation index system for freshwater aquaculture pond.[Method] The expert survey,DELPHI,field research and other methods were used.Based on the analysis of factors influencing water quality of freshwater aquaculture pond,and the importance degree of 14 factors influencing water quality of freshwater aquaculture pond was ordered.Then,five factors were selected as index to establish the water quality evaluation index system of freshwater aquaculture with the determination for thresholds of these factors.[Result] The importance degree of water quality of freshwater aquaculture pond showed an order of Dissolved oxygenpHPhytoplankton biomassSecchi depthTotal NitrogenZooplankton biomassWater temperatureBiochemical Oxygen DemandWater colorSalinityTotal hardness;according to the value of importance degree,the dissolved oxygen,pH,secchi depth,phytoplankton biomass and total nitrogen these five factors were selected as the index system of water quality evaluation of pond.The level of water quality of freshwater aquaculture pond was divided into five,and the tolerance range of fish to each index was obtained by expert observation.[Conclusion] This study had provided a scientific basis for water quality evaluation system of freshwater aquaculture pond.展开更多
A dissolved oxygen fuzzy system predicting model based on neural network was put forward in this study. 106 groups of data were used to confirm the fitness of the predicting model. The first 80 groups of data were act...A dissolved oxygen fuzzy system predicting model based on neural network was put forward in this study. 106 groups of data were used to confirm the fitness of the predicting model. The first 80 groups of data were acted as training input and the other 26 groups of data were acted as the confirmed data in the system. The result showed that the testing data was approximately the same as the predicted data. So it gave a new way to solve the problem that the status of the water quality couldn＇t be predicted in time and it＇s hard to watching and measuring the factors dynamic.展开更多
With Biolog Eco microplate, metabolic characteristics and functional diver-sity of carbon source in microflora of ponds were researched based on recitculating ponds and control ponds in order to explore effects of eco...With Biolog Eco microplate, metabolic characteristics and functional diver-sity of carbon source in microflora of ponds were researched based on recitculating ponds and control ponds in order to explore effects of eco-adjustments on microflo-ra in ponds. The results indicate that total number of bacterium, microbial metabolism activity, and diversity index in P7, P8, P1 and P2 kept higher, fol owed by P3, P4, P5 and P6. The utilization rate of microbes on sugars achieved the highest （31.0%-48.7%）, fol owed by carboxylic acid （13.4%-18.0%）, amino acid （10.1%-20.5%）, polymers （9.4%-17.0%）, biopolymer （5.7%-9.7%） and phenol （4.95%-7.50%）. Principal component analysis divided microflora in different ponds, suggesting that microbial community has varied carbon source characteristics and nitrogen-containing compound and biopolymer metabolisms are most affected.展开更多
Applied Immobilized algae bacteria (ABI) to remove ammonia of freshwater aquaculture wastewater. Temperature (T),PH,light intensity (I),dissolved oxygen (DO) and filling rate five factors plays important role in the p...Applied Immobilized algae bacteria (ABI) to remove ammonia of freshwater aquaculture wastewater. Temperature (T),PH,light intensity (I),dissolved oxygen (DO) and filling rate five factors plays important role in the process of ammonia nitrogen removal ,related data between ammonia removal and five factors was received through multi-factor orthogonal test,and established relations model between the five factor and nitrogen removal. The results show that five-factors had significant effect on AR,and the best combinations for removing AR was temperature 30 ℃,pH=7.0,light intensity 6 000 lux,dissolved oxygen 5.0 mg/L and the fill rate 10%. According to the experimental data,equation model was proposed and coefficient of determination R2 =0.864 8,P<0.05. Samples T-test was done between the model predictions and the actual measured values.Test results showed that the significant difference of overall mean value sig. (2-tailed) was 0.978 (P>0.05),it Shows that had no significant difference between model predictions and the actual measured value,and model had a high degree of fitting.展开更多
The aquaculture pond water quality was taken as research objects,based on the general analysis of factors influencing the pond water quality,the system of index estimation and assessment standard were established afte...The aquaculture pond water quality was taken as research objects,based on the general analysis of factors influencing the pond water quality,the system of index estimation and assessment standard were established after sorting by importance of the factors by means of Delphi and expert investigation.In this study,index weight was confirmed according to the importance of the factors and relative membership grade of the measured values,thus and the fuzzy comprehensive evaluation model of aquaculture pond water quality was constructed,and the fuzzy comprehensive evaluation system of freshwater aquaculture pond water quality was designed and implemented.The application of this system in the assessment of aquaculture pond water quality by a company had achieved better result.展开更多
With the rapid development of aquaculture in lakes and reservoirs, its negative effects on water quality and aquatic organisms are clearly emerging. Toward a better understanding of these effects, chemical and biologi...With the rapid development of aquaculture in lakes and reservoirs, its negative effects on water quality and aquatic organisms are clearly emerging. Toward a better understanding of these effects, chemical and biological monitoring was conducted in the Fangbian Reservoir to study the relationship between aquaculture and eutrophication. As a domestic water supply source, this reservoir has reached the mesotrophic level. The concentrations of total nitrogen （TN） and total phosphorus （TP） in the Fangbian Reservoir have frequently exceeded the prescriptive level according to the Environmental Quality Standardgfor SurJace Water （GB3838-2002）. Pond and fence aquaculture feeding is the main cause of high levels of nitrogen and phosphorus, accounting for nearly half of the total pollution, and causing the reservoir environmental capacity to be exceeded. The amounts of nitrogen and phosphorus that went directly to the reservoir through the residual bait and fish droppings in fence aquaculture were 42 768 kg per year and 10 856 kg per year respectively, from 2007 to 2009. About 2 913 kg of nitrogen and 450 kg of phosphorus were imported to the reservoir through the exchange of water from the culturing ponds at the same time. Therefore, controlling the aquaculture scale and promoting eco-aquaculture are key measures for lessening the eutrophication degree and improving the water quality.展开更多
Mussel aquaculture and large yellow croaker aquaculture areas and their environmental characteristics in Zhoushan were analyzed using satellite data and in-situ surveys.A new two-step remote sensing method was propose...Mussel aquaculture and large yellow croaker aquaculture areas and their environmental characteristics in Zhoushan were analyzed using satellite data and in-situ surveys.A new two-step remote sensing method was proposed and applied to determine the basic environmental characteristics of the best mussel and large yellow croaker aquaculture areas.This methodology includes the first step of extraction of the location distribution and the second step of the extraction of internal environmental factors.The fishery ranching index(FRI1,FRI2)was established to extract the mussel and the large yellow croaker aquaculture area in Zhoushan,using Gaofen-1(GF-1)and Gaofen-6(GF-6)satellite data with a special resolution of 2 m.In the second step,the environmental factors such as sea surface temperature(SST),chlorophyll a(Chl-a)concentration,current and tide,suspended sediment concentration(SSC)in mussel aquaculture area and large yellow croaker aquaculture area were extracted and analyzed in detail.The results show the following three points.(1)For the extraction of the mussel aquaculture area,FRI1 and FRI2 are complementary,and the combination of FRI1 and FRI2 is suitable to extract the mussel aquaculture area.As for the large yellow croaker aquaculture area extraction,FRI2 is suitable.(2)Mussel aquaculture and the large yellow croaker aquaculture area in Zhoushan are mainly located on the side near the islands that are away from the eastern open waters.The water environment factor template suitable for mussel and large yellow croaker aquaculture was determined.(3)This two-step remote sensing method can be used for the preliminary screening of potential site selection for the mussels and large yellow croaker aquaculture area in the future.the fishery ranching index(FRI1,FRI2)in this paper can be applied to extract the mussel and large yellow croaker aquaculture areas in coastal waters around the world.展开更多
Nigeria is the most populous black nation in the world,with an estimated population about 150 million people.Its citizens as at the end of 2012 have a projected fish demand of 2.66 million tonnes of fish.Fish supply w...Nigeria is the most populous black nation in the world,with an estimated population about 150 million people.Its citizens as at the end of 2012 have a projected fish demand of 2.66 million tonnes of fish.Fish supply within the said period was 1.32 million tonnes.This figure was made up of 0.7 million tonnes from importation and 0.62 million tonnes from both artisanal and aquaculture.Of the local production aquaculture contributes only 200000 tonnes.Studies have shown that fish catch from the wild has reached its maximum production limit and production from this area is currently on the decline.Nigeria has about 1.75 hm2 of suitable sites for aquaculture development.Aquaculture production for 2012 was a meager 200000 tonues.Aquaculture though a veritable means is faced with a lot of constraints ranging from government's wrong focus on industrial fisheries instead of aquaculture,poor policy formulation and non-implementation fisheries development programmes among others.In spite of these constraints,there were also the following aquaculture investment opportunities such as production of fishing equipment,establishment of modern fish farms,shrimp fishing,fingerling production,table size fish production,brood stock production,fish feed production,ornamental fish farming,production system design and construction,capacity building in project management,packaging and branding.展开更多
基金National Natural Science Foundation of China,No.42276231,No.41871112The Open Research Fund of the State Key Laboratory of Coastal and Marine Engineering,No.LP2518。
文摘Assessing the carbon sink potential of marine aquaculture is critical to fostering sustainable marine economic development and achieving carbon neutrality.This study evaluates the carbon sink potential of four nearshore aquaculture systems in China:floating raft,net cage,pond,and tidal flat.China’s coastal aquaculture shows a dramatic potential range from−5401.28×10^(4)t to 84.65×10^(4)t,acting as both a carbon sink and a source.Floating raft(11.19×10^(4)t to 105.65×10^(4)t)and tidal flat(42.83×10^(4)t to 114.35×10^(4)t)are net carbon sinks.In contrast,net cage(−427.39×10^(4)t to−4.26×10^(4)t)and pond(−5027.91×10^(4)t to−131.09×10^(4)t)are significant net carbon sources.This heterogeneity is driven by differences in species,feed inputs,energy consumption,and management practices.The results highlight the need for targeted low-carbon technologies in high-emission systems to maximize carbon sequestration and mitigate their environmental impacts.This study provides a scientific basis for optimizing carbon management and offers insights for global sustainable aquaculture and carbon neutrality.
基金financially supported by internal funding from the Temasek Life Sciences Laboratory,Singapore.
文摘Asian seabass(Lates calcarifer)is becoming an important species for aquaculture.However,the Asian seabass aquaculture industry faces a significant challenge of disease outbreaks that can jeopardize fish health and production.This review delves into the major diseases affecting Asian seabass aquaculture and explores their causes,symptoms,and management approaches.We focused on the key pathogens responsible for these outbreaks,the environmental factors contributing to disease susceptibility,and the latest advancements in disease prevention and management.By addressing these critical aspects,this review addresses the needs of aquaculturists,researchers,and policymakers with the knowledge required to promote resilient and sustainable Asian seabass farming.We aim to shed light on the challenges posed by disease while highlighting innovative strategies that offer promise for the future of this thriving industry.This comprehensive examination serves as a valuable resource for those invested in ensuring the health and vitality of Asian seabass,securing a consistent supply to meet the demands of global seafood markets.
文摘Fresh fish was the best-selling product in Xitun Supermarket in Nyingchi City,the Xizang Autonomous Region,in the second half of 2024."They were really fresh and usually sold out within half an hour,"He Mei,manager of the supermarket,said.The fish were raised by a local aquaculture farm,Nyingchi Statefarm Karma Agriculture Co.Ltd.(NSKA).
基金Supported by Science and Technology Commissioner Project of Tianjin Science and Technology Bureau(22ZYCGSN00630).
文摘[Objectives]To assess the carbon sink capacity in seawater suspension cage aquaculture of shellfish in Tianjin from 2015 to 2022.[Methods]The carbon sink capacity of different shellfish species was evaluated using both physical and value assessment methods.[Results]The shellfish cultivated in seawater suspension cages in Tianjin exhibited a significant capacity for carbon sinks.The amounts of carbon removed by suspension cage aquaculture of Rapana venosa,Crassostrea gigas,Scapharca subcrenata,Scapharca broughtonii and Argopectens irradias were 448.297,403.398,89.463,40.657,and 106.719 t,respectively.Furthermore,the total volume of shellfish cultivated in seawater exhibited a consistent upward trend over time,correlating with an annual increase in the amount of carbon removed.Among the shellfish cultivated in seawater suspension cages,the order of carbon sink capacity was as follows:C.gigas>R.venosa>A.irradias>S.subcrenata and S.broughtonii.In terms of the carbon sink capacity of soft tissues,the ranking was as follows:A.irradias>R.venosa>C.gigas>S.subcrenata and S.broughtonii.The structural and yield factors associated with seawater suspension cage aquaculture of shellfish significantly influenced the enhancement of the total carbon sink of cultivated shellfish.Notably,structural factors had a greater impact on the increase in the carbon sink of cultivated shellfish compared to total yield factors.[Conclusions]The findings will serve as a reference for enhancing the carbon sink potential of fisheries and achieving sustainable development in seawater aquaculture in Tianjin.
基金supported by the Center of Excellence on Instru-mentation Technology and Automation(CEITA),Department of Instru-mentation and Electronics Engineering,Faculty of Engineering,King Mongkut’s University of Technology North Bangkok,Thailand。
文摘This study explores the combination of ultrasound technology with a detection algorithm to categorize flow regimes in bubble columns used for aeration in aquaculture.An ultrasonic velocity profiler is used to obtain the standard deviation of the bubble velocity distributed throughout the column.The bubble velocity data for three known flow regimes were used to develop a probability density function(PDF)classification model.The experimental apparatus consisted of a circular tank equipped with a bubble generator and gas hold-up monitoring systems.The flow regimes of the experimental fluid were determined,and the classification was conducted via the PDF method.The results demonstrate that the classification accuracy is not lower than that of traditional machine learning methods.
基金supported by grants from the National Key Research and Development Program of China(No.2023YFD2401103)the Fundamental Research Funds for the Central Universities.
文摘Evaluating species composition and dynamic shifts within fouling communities is essential for developing effective strate-gies to manage biofouling in marine fish aquaculture.The coastal area in the Yellow Sea is a key area for cage aquaculture in China;however,this region faces significant challenges from biofouling organisms.Here,we employed an experimental approach in a filed mesocosm in a net cage aquaculture area in the Yellow Sea,with weekly monitoring of changes in macrofouling species on mesh nets and in the seawater,to assess the utility of water eDNA metabarcoding for identifying macrofoulers.We compared the temporal variation patterns in the composition and diversity of macrofouling communities identified through morphological method as well as COI and 18S rRNA metabarcoding.The results showed that metabarcoding detected the majority of macrofoulers identified through morphological method(64%),and revealed additional species that were overlooked by traditional monitoring approach.Furthermore,the changes in diversity and community composition over sampling dates in COI data were generally consistent with those in morphological identification,although a temporal lag existed between these two approaches.A notable shift in the fouling community occurred at the end of June with the appearance of Ectopleura crocea and Caprella sp.,marking a pivotal change in its structure.Future research could focus on developing targeted primers for these key fouling species,which would enhance the efficiency of monitoring efforts.
基金The Yangjiang Waterway Affairs Center of Guangdong Province Program under contract No.HLSJCG-20220103the Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Program under contract No.SML2023SP220.
文摘Oyster aquaculture farm(OAF)with dense wooden stakes,one of the prevalent large-scale marine culture facilities in estuaries,has the potential to influence estuarine hydrodynamics,sediment dynamics,geomorphological evolution,and sustainable development.This study investigated these impacts in the Moyang River Estuary(Guangdong Province,China)by combining a two-dimentional coupled current-wave-sediment numerical model with field observations based on the TELEMAC-MASCARET numerical simulation system.The wooden stakes of OAF were represented as rigid cylinders in the model,and key parameters were calibrated through field observations,including stake diameter(0.1 m),spacing(3 m),height(6 m),and drag coefficient.Simulations comparing scenarios with and without OAF quantified the responses of sediment dynamics to estuarine OAF.Tidal currents in the channel were strengthened,with velocity increased by 20%-70%,while currents within the OAF weakened,with the maximum reduction exceeding 0.45 m/s.Significant wave height rapidly attenuated within OAF,with the wave attenuation coefficient exceeding 50%.Concurrently,due to the effects of stronger ebb dynamics caused by OAF,sediments in the channel were eroded,inducing a larger rate of seaward residual transport over a tidal cycle.Additionally,more sediments in the middle bar were resuspended,promoting the formation of a high-concentration zone of suspended sediment(estuarine turbidity maximum)during the ebb period.These changes in sediment dynamics caused by OAF significantly influenced the geomorphological evolution of the mouth bar,driving seaward channel extension and deepening,while causing progressive vertical accretion and lateral expansion in the top and outer slope of the middle bar.Sediment resuspension and redistribution within the mouth bar facilitated net transport and redeposition along the OAF periphery.Furthermore,it is crucial to appropriately increase the stakes spacing in the management of oyster farms to ensure a stable flow of water within the OAF.These findings provide a transferable framework for investigating sediment dynamics and a scientific basis for evaluating marine aquaculture practices in other estuaries with OAF or similar anthropogenic structures worldwide.
基金supported by the Selfcultivation Project of Collaborative Innovation Center of Marine Equipment and Technology Institute of Jiangsu University of Science and Technology (No.XTCX202402)。
文摘The development and utilization of marine resources by human beings is gradually moving towards the deep sea,and deep-sea aquaculture platforms have emerged to meet the needs of aquaculture and food security.To better understand the motion response characteristics of the main structure of the full-submersible deep-sea aquaculture platform under the action of water waves,Fluent software is used to numerically simulate regular waves,irregular waves,and strong nonlinear waves,and their effects on the six degrees of freedom motion response of the main structure of the full-submersible deep-sea aquaculture platform are analyzed.The study found that under the towing condition,the smaller the wave direction angle,the more intense the movement.Under the platform’s working conditions,the larger the wave direction angle,the more intense the movement.
基金the outcome of project conducted at the Vietnam Academy of Science and Technology(VAST.07.05/24-25).
文摘Heavy metal pollution in coastal waters is on the rise,presenting serious threats to both ecosystems and human health.Coastal aquaculture zones,such as those in Quang Ninh province,are especially vulnerable due to the accumulation of heavy metals from multiple sources,including industrial wastewater,land runoff,and maritime activities.This study applies the Heavy Metal Pollution Index(HPI)to assess pollution levels based on the concentrations of nine heavy metals(Cr,Mn,Fe,Cu,Zn,As,Cd,Hg,Pb)found in seawater samples collected from coastal aquaculture areas in Quang Ninh.According to the HPI method,values exceeding 100 indicate polluted water,serving as a benchmark for evaluating heavy metal contamination in the region.A total of 25 seawater samples were collected and analyzed;of these,18 samples(72%)had HPI values above 100,signaling a concerning level of heavy metal pollution,while only 7 samples(28%)fell below the threshold,suggesting no significant contamination.These results underscore the urgent need for enhanced monitoring of water quality and stricter regulation of pollution sources to protect both environmental and public health.
基金supported by the AQUADAPT Project of the International Institute of Rural Reconstruction(IIRR)―the Philippines and Cambodia jointly funded by IDRC(International Research Development Centre of Canada)and the Government of Canada’s International Climate Finance Initiative.Project Title:Building and Evidence base for Inclusive,Nature-based Climate Solutions in Smallscale Aquaculture for Sustainable Aquatic Food Systems:Philippines and Cambodia(IDRC Project Number:110229).
文摘This study explores the status,challenges,and opportunities of smallholder aquaculture in the Leyte Sab-a Basin Peatland(LSBP),with a particular focus on the application of Nature-Based Solutions(NbS)for sustainable management.Using a mixed-methods approach that combines a comprehensive literature review with a focus group discussion(FGD)involving 22 local practitioners,the study identifies both traditional practices-such as bamboo pond structures and the use of Kangkong(Ipomoea aquatica)and Azolla as fish feed-and key constraints to productivity.These include environmental vulnerabilities(e.g.,declining water quality,climate variability),technical limitations(e.g.,disease risks,lack of fingerlings),and socio-economic barriers(e.g.,limited market access,financial insecurity,and gender inequality).While most smallholders are unfamiliar with formal NbS frameworks,their current practices already reflect ecological principles aligned with NbS.The study further highlights the socio-economic significance of aquaculture as both a livelihood resource and a contributor to food security in rural peatland communities.Linking traditional knowledge with scientifically guided NbS-such as Integrated Multi-Trophic Aquaculture(IMTA),aquaponics,and biofiltration systems-can enhance ecosystem resilience and livelihood security.In addition,strengthening gender-inclusive participation and providing equitable access to training and financial support are critical to improving resilience.This study concludes that targeted capacity-building,financial support mechanisms,and multi-stakeholder partnerships are needed to facilitate inclusive,sustainable,and climate-resilient aquaculture systems in peatland environments.Beyond addressing immediate livelihood changes,these strategies also contribute to biodiversity conservation,ecosystem restoration,and climate adaptation in fragile wetland landscapes.
基金Supported by Special Fund for the Construction of Modern Agricultural Industry Technology System(CARS-46)Special Fund for Basic Research and Operating Expenses of Central-level Research Institutes(2007JBFA03)~~
文摘The establishment of water circulation aquaculture system realized the hi- erarchical use of nitrogen, phosphorus and other eutrophic substances in aquaculture wastewater and the recirculation use of water resource. However, no research has been reported on the detailed calculation of the relationship between the area of aquaculture pond and purification pond. In this study, referring to the absorption ability of aquatic plants to pollutants in aquaculture wastewater and pollutant generation and discharge coefficient in aquaculture pond, based on the general rules of water quality management in freshwater aquaculture system, a calculation mode was es- tablished to investigate the relationship between the area of aquaculture pond and purification pond in freshwater recirculation aquaculture system, which was feasible to explain related cases and would provide theoretical basis to reduce the economic costs in the construction of water circulation aquaculture system and realize the bal- ance between the ecological benefits and the economic benefits.
基金Supported by National Natural Science Foundation of China (40801227)Foundation of Key Laboratory of Aquatic Genetic Resources and Aquacul-tural Ecology,Ministry of Agriculture (KFT2006-7)~~
文摘[Objective] The aim was to establish the water quality evaluation index system for freshwater aquaculture pond.[Method] The expert survey,DELPHI,field research and other methods were used.Based on the analysis of factors influencing water quality of freshwater aquaculture pond,and the importance degree of 14 factors influencing water quality of freshwater aquaculture pond was ordered.Then,five factors were selected as index to establish the water quality evaluation index system of freshwater aquaculture with the determination for thresholds of these factors.[Result] The importance degree of water quality of freshwater aquaculture pond showed an order of Dissolved oxygenpHPhytoplankton biomassSecchi depthTotal NitrogenZooplankton biomassWater temperatureBiochemical Oxygen DemandWater colorSalinityTotal hardness;according to the value of importance degree,the dissolved oxygen,pH,secchi depth,phytoplankton biomass and total nitrogen these five factors were selected as the index system of water quality evaluation of pond.The level of water quality of freshwater aquaculture pond was divided into five,and the tolerance range of fish to each index was obtained by expert observation.[Conclusion] This study had provided a scientific basis for water quality evaluation system of freshwater aquaculture pond.
基金Supported by National Natural Science Foundation of China (40801227)Open Foundation of Marine and Estuarine Fisheries Resources of Ministry of Agriculture and the Key Laboratory of Ecology (Open-2-04-09)~~
文摘A dissolved oxygen fuzzy system predicting model based on neural network was put forward in this study. 106 groups of data were used to confirm the fitness of the predicting model. The first 80 groups of data were acted as training input and the other 26 groups of data were acted as the confirmed data in the system. The result showed that the testing data was approximately the same as the predicted data. So it gave a new way to solve the problem that the status of the water quality couldn＇t be predicted in time and it＇s hard to watching and measuring the factors dynamic.
基金Supported by National Modern Agricultural Technology System(CARS-46)NationalSci-tech Support Plan(2012BAD25B05,2012BAD25B01)National Department PublicBenefit Research Foundation(201203083)~~
文摘With Biolog Eco microplate, metabolic characteristics and functional diver-sity of carbon source in microflora of ponds were researched based on recitculating ponds and control ponds in order to explore effects of eco-adjustments on microflo-ra in ponds. The results indicate that total number of bacterium, microbial metabolism activity, and diversity index in P7, P8, P1 and P2 kept higher, fol owed by P3, P4, P5 and P6. The utilization rate of microbes on sugars achieved the highest （31.0%-48.7%）, fol owed by carboxylic acid （13.4%-18.0%）, amino acid （10.1%-20.5%）, polymers （9.4%-17.0%）, biopolymer （5.7%-9.7%） and phenol （4.95%-7.50%）. Principal component analysis divided microflora in different ponds, suggesting that microbial community has varied carbon source characteristics and nitrogen-containing compound and biopolymer metabolisms are most affected.
基金Supported by the National Natural Science Foundation of China(No.30972260)~~
文摘Applied Immobilized algae bacteria (ABI) to remove ammonia of freshwater aquaculture wastewater. Temperature (T),PH,light intensity (I),dissolved oxygen (DO) and filling rate five factors plays important role in the process of ammonia nitrogen removal ,related data between ammonia removal and five factors was received through multi-factor orthogonal test,and established relations model between the five factor and nitrogen removal. The results show that five-factors had significant effect on AR,and the best combinations for removing AR was temperature 30 ℃,pH=7.0,light intensity 6 000 lux,dissolved oxygen 5.0 mg/L and the fill rate 10%. According to the experimental data,equation model was proposed and coefficient of determination R2 =0.864 8,P<0.05. Samples T-test was done between the model predictions and the actual measured values.Test results showed that the significant difference of overall mean value sig. (2-tailed) was 0.978 (P>0.05),it Shows that had no significant difference between model predictions and the actual measured value,and model had a high degree of fitting.
基金Supported by National Natural Science Foundation of China(40801227)Open Foundation of Key Open Laboratory of Marine and Estuarine Fishery Resources and Ecology, Ministry of Agriculture (Open-2-04-09)~~
文摘The aquaculture pond water quality was taken as research objects,based on the general analysis of factors influencing the pond water quality,the system of index estimation and assessment standard were established after sorting by importance of the factors by means of Delphi and expert investigation.In this study,index weight was confirmed according to the importance of the factors and relative membership grade of the measured values,thus and the fuzzy comprehensive evaluation model of aquaculture pond water quality was constructed,and the fuzzy comprehensive evaluation system of freshwater aquaculture pond water quality was designed and implemented.The application of this system in the assessment of aquaculture pond water quality by a company had achieved better result.
文摘With the rapid development of aquaculture in lakes and reservoirs, its negative effects on water quality and aquatic organisms are clearly emerging. Toward a better understanding of these effects, chemical and biological monitoring was conducted in the Fangbian Reservoir to study the relationship between aquaculture and eutrophication. As a domestic water supply source, this reservoir has reached the mesotrophic level. The concentrations of total nitrogen （TN） and total phosphorus （TP） in the Fangbian Reservoir have frequently exceeded the prescriptive level according to the Environmental Quality Standardgfor SurJace Water （GB3838-2002）. Pond and fence aquaculture feeding is the main cause of high levels of nitrogen and phosphorus, accounting for nearly half of the total pollution, and causing the reservoir environmental capacity to be exceeded. The amounts of nitrogen and phosphorus that went directly to the reservoir through the residual bait and fish droppings in fence aquaculture were 42 768 kg per year and 10 856 kg per year respectively, from 2007 to 2009. About 2 913 kg of nitrogen and 450 kg of phosphorus were imported to the reservoir through the exchange of water from the culturing ponds at the same time. Therefore, controlling the aquaculture scale and promoting eco-aquaculture are key measures for lessening the eutrophication degree and improving the water quality.
基金The National Key Research and Development Program of China under contract Nos 2023YFD2401900 and 2020YFD09008004the National Natural Science Foundation of China Key International(Regional)Cooperative Research Project under contract No.42020104009the Basic Public Welfare Research Program of Zhejiang Province under contract No.LGF21D010004.
文摘Mussel aquaculture and large yellow croaker aquaculture areas and their environmental characteristics in Zhoushan were analyzed using satellite data and in-situ surveys.A new two-step remote sensing method was proposed and applied to determine the basic environmental characteristics of the best mussel and large yellow croaker aquaculture areas.This methodology includes the first step of extraction of the location distribution and the second step of the extraction of internal environmental factors.The fishery ranching index(FRI1,FRI2)was established to extract the mussel and the large yellow croaker aquaculture area in Zhoushan,using Gaofen-1(GF-1)and Gaofen-6(GF-6)satellite data with a special resolution of 2 m.In the second step,the environmental factors such as sea surface temperature(SST),chlorophyll a(Chl-a)concentration,current and tide,suspended sediment concentration(SSC)in mussel aquaculture area and large yellow croaker aquaculture area were extracted and analyzed in detail.The results show the following three points.(1)For the extraction of the mussel aquaculture area,FRI1 and FRI2 are complementary,and the combination of FRI1 and FRI2 is suitable to extract the mussel aquaculture area.As for the large yellow croaker aquaculture area extraction,FRI2 is suitable.(2)Mussel aquaculture and the large yellow croaker aquaculture area in Zhoushan are mainly located on the side near the islands that are away from the eastern open waters.The water environment factor template suitable for mussel and large yellow croaker aquaculture was determined.(3)This two-step remote sensing method can be used for the preliminary screening of potential site selection for the mussels and large yellow croaker aquaculture area in the future.the fishery ranching index(FRI1,FRI2)in this paper can be applied to extract the mussel and large yellow croaker aquaculture areas in coastal waters around the world.
文摘Nigeria is the most populous black nation in the world,with an estimated population about 150 million people.Its citizens as at the end of 2012 have a projected fish demand of 2.66 million tonnes of fish.Fish supply within the said period was 1.32 million tonnes.This figure was made up of 0.7 million tonnes from importation and 0.62 million tonnes from both artisanal and aquaculture.Of the local production aquaculture contributes only 200000 tonnes.Studies have shown that fish catch from the wild has reached its maximum production limit and production from this area is currently on the decline.Nigeria has about 1.75 hm2 of suitable sites for aquaculture development.Aquaculture production for 2012 was a meager 200000 tonues.Aquaculture though a veritable means is faced with a lot of constraints ranging from government's wrong focus on industrial fisheries instead of aquaculture,poor policy formulation and non-implementation fisheries development programmes among others.In spite of these constraints,there were also the following aquaculture investment opportunities such as production of fishing equipment,establishment of modern fish farms,shrimp fishing,fingerling production,table size fish production,brood stock production,fish feed production,ornamental fish farming,production system design and construction,capacity building in project management,packaging and branding.
