Captive breeding and stocking are commonly employed strategies for enhancing fisheries and conserving endangered fish species.However,hatchery-raised fish often exhibit reduced performance in the wild,displaying alter...Captive breeding and stocking are commonly employed strategies for enhancing fisheries and conserving endangered fish species.However,hatchery-raised fish often exhibit reduced performance in the wild,displaying alterations in physiological,morphological,and behavioral traits.We tested for differences in swimming capacity and metabolic traits between wild and hatchery-reared individuals of the Spanish toothcarp(Aphanius iberus)from 2 different populations.Furthermore,we experimentally tested if these changes translated into fitness differences after their stocking into the wild.There were significant differences in swimming capacity and metabolic traits between wild and hatchery-reared individuals and also between the 2 populations.Captive-bred individuals displayed consistently lower metabolic rates than wild individuals from the same population(30-76% lower).Critical swimming speed rather differed between the 2 populations.Sex-specific differences were observed in maximum and standard metabolic rates,with wild individuals and females generally exhibiting higher values but with some exceptions.During a 3-month experiment,survival rates did not significantly differ between wild and captive-bred fish.Captive-bred individuals started smaller but exhibited rapid growth during the experiment.Initially,larger captive-bred fish had lower body conditions than their wild counterparts,but these differences progressively diminished.In summary,captive-bred individuals of this fish species showed lower metabolic rates,although the differences with wild individuals slightly depended on sex and size.展开更多
Kawakawa Euthynnus affinis(Cantor,1849)is one of the commercially exploited tuna fishery resource of India.Except landing data,no other information was available on its stock status.Hence,present study investigated th...Kawakawa Euthynnus affinis(Cantor,1849)is one of the commercially exploited tuna fishery resource of India.Except landing data,no other information was available on its stock status.Hence,present study investigated the sustainability status of kawakawa fishery from Tamil Nadu,India.Data on annual catch and effort were reconstructed for the period of 2001-2020.The Catch-based MSY(CMSY),the Bayesian state-space Schaefer surplus production Model(BSM),and stochastic Surplus Production model in Continuous Time(SPiCT)packages were used to investigate the stock exploitation by running surplus production models with catch,catch per unit effort(CPUE),and other life history data.The biological reference points result of maximum sustainable yield(MSY)or biomass giving MSY(Bmsy)and fishing mortality giving MSY(Fmsy)of all the models indicated that the kawakawa stock in Tamil Nadu was subjected to overfishing and heading towards overfished status in recent decades.Results of the present study suggest reduction of fishing effort to keep the landing at MSY level and achieve a sustainable fishery.展开更多
Fish stocking is a common practice for restocking wild populations of fishes,and the growth conditions of hatchery-raised fishes are a major key for successful recruitment.Yet,there are few studies that compare the gr...Fish stocking is a common practice for restocking wild populations of fishes,and the growth conditions of hatchery-raised fishes are a major key for successful recruitment.Yet,there are few studies that compare the growth of hatchery-reared juvenile fishes with wild populations.We compared the growth conditions of hatchery flounders,Paralichthys olivaceus,at two fish farms in Korea with that of natural stocks.All of the relationships of growth parameters including total length-weight,otolith-total length,and weight/length ratio relative to otolith length indicated that the growth was similar between the wild and the reared fishes at the two fish farms.The results suggest that the fishes grown at farming facilities should have a similar probability of recruitment as wild juveniles.展开更多
基金supported by the supported by the Spanish Ministry of Science,Innovation and Universities(MCIN/AEI/10.13039/501100011033)the European Union(NextGenerationEU/PRTR)through projects CGL2016-80820-R,PID2019-103936GB-C21,TED2021-129889B-I00,and RED2022-134338-T.
文摘Captive breeding and stocking are commonly employed strategies for enhancing fisheries and conserving endangered fish species.However,hatchery-raised fish often exhibit reduced performance in the wild,displaying alterations in physiological,morphological,and behavioral traits.We tested for differences in swimming capacity and metabolic traits between wild and hatchery-reared individuals of the Spanish toothcarp(Aphanius iberus)from 2 different populations.Furthermore,we experimentally tested if these changes translated into fitness differences after their stocking into the wild.There were significant differences in swimming capacity and metabolic traits between wild and hatchery-reared individuals and also between the 2 populations.Captive-bred individuals displayed consistently lower metabolic rates than wild individuals from the same population(30-76% lower).Critical swimming speed rather differed between the 2 populations.Sex-specific differences were observed in maximum and standard metabolic rates,with wild individuals and females generally exhibiting higher values but with some exceptions.During a 3-month experiment,survival rates did not significantly differ between wild and captive-bred fish.Captive-bred individuals started smaller but exhibited rapid growth during the experiment.Initially,larger captive-bred fish had lower body conditions than their wild counterparts,but these differences progressively diminished.In summary,captive-bred individuals of this fish species showed lower metabolic rates,although the differences with wild individuals slightly depended on sex and size.
文摘Kawakawa Euthynnus affinis(Cantor,1849)is one of the commercially exploited tuna fishery resource of India.Except landing data,no other information was available on its stock status.Hence,present study investigated the sustainability status of kawakawa fishery from Tamil Nadu,India.Data on annual catch and effort were reconstructed for the period of 2001-2020.The Catch-based MSY(CMSY),the Bayesian state-space Schaefer surplus production Model(BSM),and stochastic Surplus Production model in Continuous Time(SPiCT)packages were used to investigate the stock exploitation by running surplus production models with catch,catch per unit effort(CPUE),and other life history data.The biological reference points result of maximum sustainable yield(MSY)or biomass giving MSY(Bmsy)and fishing mortality giving MSY(Fmsy)of all the models indicated that the kawakawa stock in Tamil Nadu was subjected to overfishing and heading towards overfished status in recent decades.Results of the present study suggest reduction of fishing effort to keep the landing at MSY level and achieve a sustainable fishery.
文摘Fish stocking is a common practice for restocking wild populations of fishes,and the growth conditions of hatchery-raised fishes are a major key for successful recruitment.Yet,there are few studies that compare the growth of hatchery-reared juvenile fishes with wild populations.We compared the growth conditions of hatchery flounders,Paralichthys olivaceus,at two fish farms in Korea with that of natural stocks.All of the relationships of growth parameters including total length-weight,otolith-total length,and weight/length ratio relative to otolith length indicated that the growth was similar between the wild and the reared fishes at the two fish farms.The results suggest that the fishes grown at farming facilities should have a similar probability of recruitment as wild juveniles.
