The analysis of cetacean strandings can provide fundamental information about species diversity and composition in a particular region. The present study collected and analyzed cetacean strandings, bycatches and rescu...The analysis of cetacean strandings can provide fundamental information about species diversity and composition in a particular region. The present study collected and analyzed cetacean strandings, bycatches and rescues along the western coast of the Taiwan Strait, China, from 2010 to 2015. In total, 48 records, including 37 strandings, 8 bycatches and 3 rescues, involving 13 known species were collected. Among them, Indo-Pacific humpback dolphins（Sousa chinensis） and finless porpoises（Neophocaena phocaenoides） were the most common species, consisting of 31.3% and 25%, respectively. Notably, 10 out of the 48（20.8%） records were collected from the Pingtan Island and included 3 species of Mysticeti and 4 species of Odontoceti. Finally, we compared the cetacean species composition between the western and eastern coasts of the Taiwan Strait; 31 cetacean species occurred in the Taiwan Strait, indicating a relatively high cetacean diversity in this region. Systematic field surveys are urgently needed to explore the cetacean species composition, population stock and the related habitat status in the Taiwan Strait, which may improve conservation management in the future.展开更多
An increasing interest of the economic operators on the bycatch of shrimp fishery endangers bycatch species to over-exploitation risks. This study provides a better knowledge regarding to the current status of one maj...An increasing interest of the economic operators on the bycatch of shrimp fishery endangers bycatch species to over-exploitation risks. This study provides a better knowledge regarding to the current status of one major component of the bycatches Otolithes argenteus （O. argenteus） caught in the shrimp fishery area along the West coast of Madagascar using the morphometric analysis. Individual body weight and body measurement were carried out on 565 specimens collected from the sale＇s society of seafood （SOPROMER） in the Capital city. Results show a high proportion of small fishes like as immature young individuals. A ＂negative allometry＂ growth type within the juveniles to become ＂isometric allometry＂ for the adult, large size was observed. Marine environment is favorable to the development for the whole population of the O. argenteus species. The morphometry approach helped to better understanding of the characteristics and the operating status of the O. argenteus population thus constitute as a tool in establishing a sustainable fisheries management strategy in Madagascar.展开更多
The issue of bycatch in the fisheries sector has been a major concern for the marine biologists over few decades in terms of conservation of marine eco-system and sustainability of the fisheries sector and marine biod...The issue of bycatch in the fisheries sector has been a major concern for the marine biologists over few decades in terms of conservation of marine eco-system and sustainability of the fisheries sector and marine biodiversity.As far as the concept of Bycatch is concerned,these are the unwanted species having less commercial importance,which in most of the cases disposed into the seas onboard or are caught during fishing.The article discusses the social,economic,cultural,and environmental impacts in addressing the issue of bycatch.The concern regarding bycatch is relatively new in the horizon in Indian perspective though it is often considered a major issue faced by developed nations since long.The problem of bycatch poses a serious threat to livelihoods and food security as it acts as a precursor to depletion of the food sources for local consumption with adverse social,economic,cultural,and environmental impacts.The adverse effects of by-catch can be mitigated through commercialisation of bycatch and making profits from the sale of bycatch,opening up of new markets for bycatch species or products,uses of bycatch as fishmeal and application of bycatch reduction devices(BRDs).Reorientation of the present monitoring system to collect fisheries data,strengthening technical know-how,bringing effective policy intervention,efficient co-management,and sincere and honest efforts in reducing bycatch and discards may provide a considerable impact towards sustainability of marine eco-system.展开更多
为了分析围网渔业的兼捕渔获物组成分布并评估其对非目标物种的潜在影响,本研究基于中西太平洋渔业委员会(Western and Central Pacific Fisheries Commission,WCPFC)提供的2013—2022年金枪鱼渔业及兼捕数据,对兼捕渔获物的种类、数量...为了分析围网渔业的兼捕渔获物组成分布并评估其对非目标物种的潜在影响,本研究基于中西太平洋渔业委员会(Western and Central Pacific Fisheries Commission,WCPFC)提供的2013—2022年金枪鱼渔业及兼捕数据,对兼捕渔获物的种类、数量及空间分布特征进行了系统分析。并将兼捕率与三大目标鱼种[鲣鱼(Katsuwonus pelamis)、黄鳍金枪鱼(Thunnus albacores)、大眼金枪鱼(Thunnus obesus)]的渔获率进行相关性分析,以探讨不同非目标物种的兼捕模式及其与目标渔获物的关系。研究结果显示,围网渔业的主要兼捕渔获物共48种,总计439 623尾,包括鲸豚类、鲨鱼和海龟等。其中,镰状真鲨(Carcharhinus falciformis)兼捕最多,达418 387尾,占兼捕总量的95%。兼捕主要发生在10°S~10°N和140°E~150°W附近海域。此外,东经海域的兼捕率普遍高于西经海域,且鲸豚类的兼捕率在东西经海域的差异最为显著。相关性分析结果表明,鲸豚类和鲨鱼的兼捕率与目标鱼种的渔获率无显著相关性,而海龟的兼捕率与鲣鱼和大眼金枪鱼的渔获率呈正相关关系。研究表明,围网渔业在特定海域对部分非目标物种存在较高的兼捕风险,特别是镰状真鲨的兼捕占比极高,同时东经海域的兼捕率整体高于西经海域。该研究结果为制定减少兼捕的措施提供了科学依据,进而保护生态系统平衡发展。展开更多
随着渔业养护和管理的常态化和规范化,兼捕渔获物的研究和管理近年来逐渐成为渔业养护和管理研究的重点和热点。大青鲨属于大洋性高度洄游物种,是金枪鱼延绳钓等渔业中重要的兼捕渔获物。本研究使用来自北太平洋金枪鱼与类金枪鱼国际科...随着渔业养护和管理的常态化和规范化,兼捕渔获物的研究和管理近年来逐渐成为渔业养护和管理研究的重点和热点。大青鲨属于大洋性高度洄游物种,是金枪鱼延绳钓等渔业中重要的兼捕渔获物。本研究使用来自北太平洋金枪鱼与类金枪鱼国际科学委员会(International Scientific Committee for Tuna and Tuna-like Species in the North Pacific Ocean, ISC)的大青鲨(Prionace glauca)渔获量数据,构造反映渔业状态和种群动态的操作模型,使用MSEtool对备选管理策略进行量化分析,权衡管理策略的实施效果,讨论了相对最适管理策略。分别拟合日本、夏威夷、墨西哥、太平洋共同体秘书处(The Pacific Community, SPC)和中国台湾提交的丰度指数数据,计算总可捕量(Total Allowable Catches, TACs),最后通过敏感性测试对模型的稳健性进行了评价。本研究为我国积极参与国际渔业管理提供了科学支撑和技术保障。展开更多
The offshore Northern shrimp(Pandalus borealis)bottom trawl fishery in eastern Canada currently uses 22 and 28 mm bar spacing Nordmøre grids to limit bycatch from using small mesh codends.However,a recent rebound...The offshore Northern shrimp(Pandalus borealis)bottom trawl fishery in eastern Canada currently uses 22 and 28 mm bar spacing Nordmøre grids to limit bycatch from using small mesh codends.However,a recent rebound of juvenile redfish(Sebastes spp.),that can pass through the grids,has greatly increased bycatch.To address this concern,this study investigated the effectiveness of 17 and 15 mm bar spacing Nordmøre grids in a twin-trawl(paired)configuration against the traditional 22 mm bar spacing grid.Size selectivity analyses showed that the 17 and 15 mm grids resulted in no significant reduction in shrimp catch across all length classes.The 17 mm grid significantly reduced redfish bycatch for all length classes and the 15 mm grid significantly reduced redfish bycatch for individuals larger than 95 mm total length.Less redfish entered the codend with the experimental grids,however,the overlap in width between redfish and Northern shrimp limits the overall sorting efficiency of the grids,leaving some redfish still vulnerable to capture.展开更多
基金The National Natural Science Foundation for Young Scholars of China under contract No.41506164the foundation of the State Oceanic Administration of China under contract No.201105011+3 种基金the Natural Science Foundation for Young Scholars of Fujian Province under contract No.2017J05062China-ASEAN maritime cooperation fund under contract No.HX150702the foundation of the Ministry of Agriculture of the People’s Republic of China under contract No.1070413701307the Ocean Park Conservation Foundation,Hong Kong(OPCFHK)under contract No.MM03_1617
文摘The analysis of cetacean strandings can provide fundamental information about species diversity and composition in a particular region. The present study collected and analyzed cetacean strandings, bycatches and rescues along the western coast of the Taiwan Strait, China, from 2010 to 2015. In total, 48 records, including 37 strandings, 8 bycatches and 3 rescues, involving 13 known species were collected. Among them, Indo-Pacific humpback dolphins（Sousa chinensis） and finless porpoises（Neophocaena phocaenoides） were the most common species, consisting of 31.3% and 25%, respectively. Notably, 10 out of the 48（20.8%） records were collected from the Pingtan Island and included 3 species of Mysticeti and 4 species of Odontoceti. Finally, we compared the cetacean species composition between the western and eastern coasts of the Taiwan Strait; 31 cetacean species occurred in the Taiwan Strait, indicating a relatively high cetacean diversity in this region. Systematic field surveys are urgently needed to explore the cetacean species composition, population stock and the related habitat status in the Taiwan Strait, which may improve conservation management in the future.
文摘An increasing interest of the economic operators on the bycatch of shrimp fishery endangers bycatch species to over-exploitation risks. This study provides a better knowledge regarding to the current status of one major component of the bycatches Otolithes argenteus （O. argenteus） caught in the shrimp fishery area along the West coast of Madagascar using the morphometric analysis. Individual body weight and body measurement were carried out on 565 specimens collected from the sale＇s society of seafood （SOPROMER） in the Capital city. Results show a high proportion of small fishes like as immature young individuals. A ＂negative allometry＂ growth type within the juveniles to become ＂isometric allometry＂ for the adult, large size was observed. Marine environment is favorable to the development for the whole population of the O. argenteus species. The morphometry approach helped to better understanding of the characteristics and the operating status of the O. argenteus population thus constitute as a tool in establishing a sustainable fisheries management strategy in Madagascar.
文摘The issue of bycatch in the fisheries sector has been a major concern for the marine biologists over few decades in terms of conservation of marine eco-system and sustainability of the fisheries sector and marine biodiversity.As far as the concept of Bycatch is concerned,these are the unwanted species having less commercial importance,which in most of the cases disposed into the seas onboard or are caught during fishing.The article discusses the social,economic,cultural,and environmental impacts in addressing the issue of bycatch.The concern regarding bycatch is relatively new in the horizon in Indian perspective though it is often considered a major issue faced by developed nations since long.The problem of bycatch poses a serious threat to livelihoods and food security as it acts as a precursor to depletion of the food sources for local consumption with adverse social,economic,cultural,and environmental impacts.The adverse effects of by-catch can be mitigated through commercialisation of bycatch and making profits from the sale of bycatch,opening up of new markets for bycatch species or products,uses of bycatch as fishmeal and application of bycatch reduction devices(BRDs).Reorientation of the present monitoring system to collect fisheries data,strengthening technical know-how,bringing effective policy intervention,efficient co-management,and sincere and honest efforts in reducing bycatch and discards may provide a considerable impact towards sustainability of marine eco-system.
文摘随着渔业养护和管理的常态化和规范化,兼捕渔获物的研究和管理近年来逐渐成为渔业养护和管理研究的重点和热点。大青鲨属于大洋性高度洄游物种,是金枪鱼延绳钓等渔业中重要的兼捕渔获物。本研究使用来自北太平洋金枪鱼与类金枪鱼国际科学委员会(International Scientific Committee for Tuna and Tuna-like Species in the North Pacific Ocean, ISC)的大青鲨(Prionace glauca)渔获量数据,构造反映渔业状态和种群动态的操作模型,使用MSEtool对备选管理策略进行量化分析,权衡管理策略的实施效果,讨论了相对最适管理策略。分别拟合日本、夏威夷、墨西哥、太平洋共同体秘书处(The Pacific Community, SPC)和中国台湾提交的丰度指数数据,计算总可捕量(Total Allowable Catches, TACs),最后通过敏感性测试对模型的稳健性进行了评价。本研究为我国积极参与国际渔业管理提供了科学支撑和技术保障。
文摘The offshore Northern shrimp(Pandalus borealis)bottom trawl fishery in eastern Canada currently uses 22 and 28 mm bar spacing Nordmøre grids to limit bycatch from using small mesh codends.However,a recent rebound of juvenile redfish(Sebastes spp.),that can pass through the grids,has greatly increased bycatch.To address this concern,this study investigated the effectiveness of 17 and 15 mm bar spacing Nordmøre grids in a twin-trawl(paired)configuration against the traditional 22 mm bar spacing grid.Size selectivity analyses showed that the 17 and 15 mm grids resulted in no significant reduction in shrimp catch across all length classes.The 17 mm grid significantly reduced redfish bycatch for all length classes and the 15 mm grid significantly reduced redfish bycatch for individuals larger than 95 mm total length.Less redfish entered the codend with the experimental grids,however,the overlap in width between redfish and Northern shrimp limits the overall sorting efficiency of the grids,leaving some redfish still vulnerable to capture.
