Pub Date : 2011-01-03DOI: 10.1080/10641262.2010.531794
E. Voultsiadou, T. Dailianis, C. Antoniadou, D. Vafidis, C. Dounas, C. Chintiroglou
This study attempts to evaluate the status of the populations of bath sponges (species of the genera Spongia and Hippospongia) in the Aegean, combining historical sources dated before a series of disease outbreaks that occurred from 1986 on, unpublished data obtained during the recovery phase after the first incident, as well as a current survey of the main spongiferous beds in the area. The latter was implemented through an extensive sampling trip assisted by professional sponge fishermen, including 55 stations distributed in 17 Aegean islands. Our analysis of population and morphometric data exhibits regeneration potential for bath sponge stocks, yet highlights the contrast between their present status and that of historical times. Uniformity is not evident, as several populations retain high abundances, while simultaneously areas purportedly rich in bath sponges appear deprived. Small-scale environmental regimes in the Aegean are proposed as the shaping factors of this situation; however, the importance of additional elaborate studies and the implementation of an effective regulation scheme regarding their fisheries are stressed.
{"title":"Aegean Bath Sponges: Historical Data and Current Status","authors":"E. Voultsiadou, T. Dailianis, C. Antoniadou, D. Vafidis, C. Dounas, C. Chintiroglou","doi":"10.1080/10641262.2010.531794","DOIUrl":"https://doi.org/10.1080/10641262.2010.531794","url":null,"abstract":"This study attempts to evaluate the status of the populations of bath sponges (species of the genera Spongia and Hippospongia) in the Aegean, combining historical sources dated before a series of disease outbreaks that occurred from 1986 on, unpublished data obtained during the recovery phase after the first incident, as well as a current survey of the main spongiferous beds in the area. The latter was implemented through an extensive sampling trip assisted by professional sponge fishermen, including 55 stations distributed in 17 Aegean islands. Our analysis of population and morphometric data exhibits regeneration potential for bath sponge stocks, yet highlights the contrast between their present status and that of historical times. Uniformity is not evident, as several populations retain high abundances, while simultaneously areas purportedly rich in bath sponges appear deprived. Small-scale environmental regimes in the Aegean are proposed as the shaping factors of this situation; however, the importance of additional elaborate studies and the implementation of an effective regulation scheme regarding their fisheries are stressed.","PeriodicalId":49627,"journal":{"name":"Reviews in Fisheries Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10641262.2010.531794","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59680294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-01-03DOI: 10.1080/10641262.2010.533794
W. Sinclair, S. Newman, Gabriel M. Vianna, Steven R. Williams, W. Aspden
The fragmented distribution of Nautilus pompilius and its biology suggest there will be significant genetic divergence and spatial subdivision between east and west Australian populations. Samples were collected from the northern Great Barrier Reef, the Coral Sea, and the Scott Reef off Western Australia. Phylogenetic trees and a minimum spanning tree were developed from these data to elucidate evolutionary relationships. These data demonstrate significant evolutionary separation of each of the three populations into strongly supported discrete clades matching geographic stratification. Within each of the discrete populations, genetic variation is evident. Strong inter-population variation is evident, with discrete geographic clades being recognized for each extant group. The distinct spatial subdivision between east and west Australian populations of Nautilus are related to geographic and physical isolation over evolutionary time, and this has important fisheries management implications. The distinct geographic patterns of genetic structuring demonstrated by these data indicate the existence of discrete eastern and western Australian management units, and as such, these Nautilus populations should be managed discretely, as each has a high conservation value containing unique genetic variation.
{"title":"Spatial Subdivision and Genetic Diversity in Populations on the East and West Coasts of Australia: The Multi-Faceted Case of Nautilus pompilius (Mollusca, Cephalopoda)","authors":"W. Sinclair, S. Newman, Gabriel M. Vianna, Steven R. Williams, W. Aspden","doi":"10.1080/10641262.2010.533794","DOIUrl":"https://doi.org/10.1080/10641262.2010.533794","url":null,"abstract":"The fragmented distribution of Nautilus pompilius and its biology suggest there will be significant genetic divergence and spatial subdivision between east and west Australian populations. Samples were collected from the northern Great Barrier Reef, the Coral Sea, and the Scott Reef off Western Australia. Phylogenetic trees and a minimum spanning tree were developed from these data to elucidate evolutionary relationships. These data demonstrate significant evolutionary separation of each of the three populations into strongly supported discrete clades matching geographic stratification. Within each of the discrete populations, genetic variation is evident. Strong inter-population variation is evident, with discrete geographic clades being recognized for each extant group. The distinct spatial subdivision between east and west Australian populations of Nautilus are related to geographic and physical isolation over evolutionary time, and this has important fisheries management implications. The distinct geographic patterns of genetic structuring demonstrated by these data indicate the existence of discrete eastern and western Australian management units, and as such, these Nautilus populations should be managed discretely, as each has a high conservation value containing unique genetic variation.","PeriodicalId":49627,"journal":{"name":"Reviews in Fisheries Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10641262.2010.533794","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59680302","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-01-03DOI: 10.1080/10641262.2010.543961
S. Newman, C. Skepper, Gabby E.A. Mitsopoulos, C. Wakefield, J. Meeuwig, E. Harvey
Fish traps are the principal fishing gear used in the Northern Demersal Scalefish Fishery. These fish traps are left at sea (dumped) between trips and are occasionally lost. The present study quantified the number of fish caught by baited fish traps set on the seabed and left to fish over the short (∼ 3 hr, within a trip) to medium term (12 days, between trips). Traps continued to retain fish for the duration of the experiment, despite the fact that all bait was exhausted within 3 hr. The catch rate of the traps was not significantly different for a range of teleost species and species groups over the 12-day duration of the experiment, with some exceptions. Catches after the 12-day soak time were similar to those soak times of only a few hours for most species and species groups. Importantly, despite the ability of fish to enter and exit traps, traps set for several days continue to catch fish. Fisheries monitoring and management implications primarily include errors in catch rate estimates from unaccounted fishing effort (soak time) from dumped traps and/or secondarily unaccounted mortality from lost fishing gear, both of which result in increased uncertainty in stock assessments.
{"title":"Assessment of the Potential Impacts of Trap Usage and Ghost Fishing on the Northern Demersal Scalefish Fishery","authors":"S. Newman, C. Skepper, Gabby E.A. Mitsopoulos, C. Wakefield, J. Meeuwig, E. Harvey","doi":"10.1080/10641262.2010.543961","DOIUrl":"https://doi.org/10.1080/10641262.2010.543961","url":null,"abstract":"Fish traps are the principal fishing gear used in the Northern Demersal Scalefish Fishery. These fish traps are left at sea (dumped) between trips and are occasionally lost. The present study quantified the number of fish caught by baited fish traps set on the seabed and left to fish over the short (∼ 3 hr, within a trip) to medium term (12 days, between trips). Traps continued to retain fish for the duration of the experiment, despite the fact that all bait was exhausted within 3 hr. The catch rate of the traps was not significantly different for a range of teleost species and species groups over the 12-day duration of the experiment, with some exceptions. Catches after the 12-day soak time were similar to those soak times of only a few hours for most species and species groups. Importantly, despite the ability of fish to enter and exit traps, traps set for several days continue to catch fish. Fisheries monitoring and management implications primarily include errors in catch rate estimates from unaccounted fishing effort (soak time) from dumped traps and/or secondarily unaccounted mortality from lost fishing gear, both of which result in increased uncertainty in stock assessments.","PeriodicalId":49627,"journal":{"name":"Reviews in Fisheries Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10641262.2010.543961","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59680399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-01-03DOI: 10.1080/10641262.2010.528711
T. Ward, P. Burch, L. McLeay, Alex R. Ivey
Analyses of data collected over a decade off southern Australia confirm that estimates of spawning biomass of Sardinops sagax obtained using the daily egg production method are imprecise and suggest that if inappropriate analytical methods are used, estimates may also be biased. Spawning biomass estimates are most affected by variation in mean daily egg production (P0), spawning area, and spawning fraction. The log-linear mortality model (with one egg added to each day class of eggs at each positive site) should be used to estimate P0 because it fits strongly over-dispersed sardine egg density data better and provides more logically consistent and precautionary estimates of P0 than the exponential mortality model or generalized linear models. Most generalized linear models produced inflated estimates of P0 when egg data were strongly over-dispersed. The area surveyed should be sub-divided into a large number (e.g., 300) of similar sized grids. The Voronoi natural neighbor method should be used to calculate grid size for estimation of the spawning area because it reduces subjectivity in sub-division of the sampling area. Potential biases in spawning fraction can be minimized by calculating this parameter using data from all three stages of post-ovulatory follicles (combined). Priorities for future research are identified.
{"title":"Use of the Daily Egg Production Method for Stock Assessment of Sardine, Sardinops sagax; Lessons Learned over a Decade of Application off Southern Australia","authors":"T. Ward, P. Burch, L. McLeay, Alex R. Ivey","doi":"10.1080/10641262.2010.528711","DOIUrl":"https://doi.org/10.1080/10641262.2010.528711","url":null,"abstract":"Analyses of data collected over a decade off southern Australia confirm that estimates of spawning biomass of Sardinops sagax obtained using the daily egg production method are imprecise and suggest that if inappropriate analytical methods are used, estimates may also be biased. Spawning biomass estimates are most affected by variation in mean daily egg production (P0), spawning area, and spawning fraction. The log-linear mortality model (with one egg added to each day class of eggs at each positive site) should be used to estimate P0 because it fits strongly over-dispersed sardine egg density data better and provides more logically consistent and precautionary estimates of P0 than the exponential mortality model or generalized linear models. Most generalized linear models produced inflated estimates of P0 when egg data were strongly over-dispersed. The area surveyed should be sub-divided into a large number (e.g., 300) of similar sized grids. The Voronoi natural neighbor method should be used to calculate grid size for estimation of the spawning area because it reduces subjectivity in sub-division of the sampling area. Potential biases in spawning fraction can be minimized by calculating this parameter using data from all three stages of post-ovulatory follicles (combined). Priorities for future research are identified.","PeriodicalId":49627,"journal":{"name":"Reviews in Fisheries Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10641262.2010.528711","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59680222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-01-03DOI: 10.1080/10641262.2010.531793
V. T. La, S. Cooke
Occurrences of fish kills are increasing in aquatic ecosystems worldwide, and have been attributed to natural phenomena, as well as human modification and pollution of terrestrial and aquatic environments. Despite contemporary research activities, the science of fish kill investigations is still rudimentary and has advanced little since the 1960s. Here, we highlight the complexity of fish kills and provide a critical commentary on the key challenges that must be overcome in order to advance the science of fish kill investigation. Such challenges include recognizing the potential for carry-over effects, biotic factors, and multiple stressors when conducting fish kill investigations. We recommend an interdisciplinary approach that includes recent innovations in field physiology, functional genomics, and greater reliance on fish health professionals. We also recommend additional efforts to develop databases for tracking fish kills, as well as more attempts to publish fish kill studies in the peer-reviewed literature. The recommendations that we provide will advance our ability to identify fish kill causes, and consequently allow us to implement preventative measures to reduce the frequency and magnitude of fish kills worldwide.
{"title":"Advancing the Science and Practice of Fish Kill Investigations","authors":"V. T. La, S. Cooke","doi":"10.1080/10641262.2010.531793","DOIUrl":"https://doi.org/10.1080/10641262.2010.531793","url":null,"abstract":"Occurrences of fish kills are increasing in aquatic ecosystems worldwide, and have been attributed to natural phenomena, as well as human modification and pollution of terrestrial and aquatic environments. Despite contemporary research activities, the science of fish kill investigations is still rudimentary and has advanced little since the 1960s. Here, we highlight the complexity of fish kills and provide a critical commentary on the key challenges that must be overcome in order to advance the science of fish kill investigation. Such challenges include recognizing the potential for carry-over effects, biotic factors, and multiple stressors when conducting fish kill investigations. We recommend an interdisciplinary approach that includes recent innovations in field physiology, functional genomics, and greater reliance on fish health professionals. We also recommend additional efforts to develop databases for tracking fish kills, as well as more attempts to publish fish kill studies in the peer-reviewed literature. The recommendations that we provide will advance our ability to identify fish kill causes, and consequently allow us to implement preventative measures to reduce the frequency and magnitude of fish kills worldwide.","PeriodicalId":49627,"journal":{"name":"Reviews in Fisheries Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10641262.2010.531793","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59680230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-10-06DOI: 10.1080/10641262.2010.519994
W. Howell
The editors, both of whom are well known and respected experts in marine finfish aquaculture, state in the Preface that the aim of the book is to provide a valuable reference for those in the aquac...
{"title":"A Review of “Practical Flatfish Culture and Stock Enhancement”","authors":"W. Howell","doi":"10.1080/10641262.2010.519994","DOIUrl":"https://doi.org/10.1080/10641262.2010.519994","url":null,"abstract":"The editors, both of whom are well known and respected experts in marine finfish aquaculture, state in the Preface that the aim of the book is to provide a valuable reference for those in the aquac...","PeriodicalId":49627,"journal":{"name":"Reviews in Fisheries Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2010-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10641262.2010.519994","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59679844","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-10-06DOI: 10.1080/10641262.2010.516035
Jonathan Moorhead, C. Zeng
The increasingly popular aquarium hobby is fueling the rapid growth of the aquatic ornamental industry, particularly the trade of marine ornamental species. However, currently there is a heavy reliance on wild caught marine ornamentals to satisfy consumer demand. As public awareness of the plight of marine ecosystems grows, the often destructive and unmanaged exploitation of coral reefs for the marine ornamental trade has raised concerns. Therefore, there is consensus that urgent actions need to be taken to limit destructive exploitation of coral reefs, and to ensure the sustainability of the marine ornamental industry. An obvious and vital action of such efforts would be the development of captive breeding techniques for marine ornamental species, in particular, coral reef fish. Research efforts towards captive breeding of marine ornamental species, also known as marine ornamental aquaculture, stand to supplement or replace the supply of wild caught specimens for the marine ornamental trade, and potentially help boost reef recovery efforts through restocking. However, unfortunately, the marine ornamental aquaculture sector is still in its infancy, receiving limited research attention, and, in turn, has experienced very slow development compared to the technical and industrial advances made in foodfish aquaculture. While it is true that at present, multiple bottlenecks have severely limited the progress of marine ornamental aquaculture, through careful appraisal and adaptation of culture techniques developed for foodfish, and by addressing the specific needs of marine ornamental aquaculture, significant progress could be made for the marine ornamental aquaculture industry. With this objective in mind, this review attempts to summarize the major bottlenecks facing the marine ornamental aquaculture industry, and to highlight weaknesses in the current state of research. Major areas in need of increased research efforts include broodstock management, such as the development of specific broodstock diets and broodstock husbandry, spawning induction via hormone technologies that are tailored to the size and sensitivity of small broodstock ornamentals, and comprehensive, species-specific larval rearing techniques, including system design and larval culture conditions as well as larval feeds and nutrition.
{"title":"Development of Captive Breeding Techniques for Marine Ornamental Fish: A Review","authors":"Jonathan Moorhead, C. Zeng","doi":"10.1080/10641262.2010.516035","DOIUrl":"https://doi.org/10.1080/10641262.2010.516035","url":null,"abstract":"The increasingly popular aquarium hobby is fueling the rapid growth of the aquatic ornamental industry, particularly the trade of marine ornamental species. However, currently there is a heavy reliance on wild caught marine ornamentals to satisfy consumer demand. As public awareness of the plight of marine ecosystems grows, the often destructive and unmanaged exploitation of coral reefs for the marine ornamental trade has raised concerns. Therefore, there is consensus that urgent actions need to be taken to limit destructive exploitation of coral reefs, and to ensure the sustainability of the marine ornamental industry. An obvious and vital action of such efforts would be the development of captive breeding techniques for marine ornamental species, in particular, coral reef fish. Research efforts towards captive breeding of marine ornamental species, also known as marine ornamental aquaculture, stand to supplement or replace the supply of wild caught specimens for the marine ornamental trade, and potentially help boost reef recovery efforts through restocking. However, unfortunately, the marine ornamental aquaculture sector is still in its infancy, receiving limited research attention, and, in turn, has experienced very slow development compared to the technical and industrial advances made in foodfish aquaculture. While it is true that at present, multiple bottlenecks have severely limited the progress of marine ornamental aquaculture, through careful appraisal and adaptation of culture techniques developed for foodfish, and by addressing the specific needs of marine ornamental aquaculture, significant progress could be made for the marine ornamental aquaculture industry. With this objective in mind, this review attempts to summarize the major bottlenecks facing the marine ornamental aquaculture industry, and to highlight weaknesses in the current state of research. Major areas in need of increased research efforts include broodstock management, such as the development of specific broodstock diets and broodstock husbandry, spawning induction via hormone technologies that are tailored to the size and sensitivity of small broodstock ornamentals, and comprehensive, species-specific larval rearing techniques, including system design and larval culture conditions as well as larval feeds and nutrition.","PeriodicalId":49627,"journal":{"name":"Reviews in Fisheries Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2010-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10641262.2010.516035","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59679765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-10-06DOI: 10.1080/10641262.2010.516374
G. Parkes, James A. Young, S. Walmsley, R. Abel, J. Harman, P. Horvát, A. Lem, A. Macfarlane, Maarten Mens, Conor Nolan
This article presents the results of a global review of organizations that provide sustainable fisheries information—including ecolabels, recommendation lists, and supermarkets—to consumers and supply chain intermediaries. It examined 17 organizations and key supermarkets that communicate on the sustainability of world fisheries and aquaculture products. Certification schemes assess a relatively small number of specific fisheries and indicate sustainability through labels. Recommendation lists cover more species and areas but in less detail. Most schemes showed improving conformance with FAO guidelines for fisheries and aquaculture certification. However, significant variation in fisheries’ assessment exists, calling into question the accuracy and precision of information and advice provided. Inconsistent approaches and contradictory advice among certification schemes and recommendation lists potentially increase consumer confusion and reduce their credibility. The review identifies seven critical attributes that schemes must address—scope, accuracy, independence, precision, transparency, standardization, and cost-effectiveness—and recommends that certification schemes and recommendation lists enhance their consistency and credibility through compliance with these attributes and FAO guidelines. Fish sustainability information schemes play an important role in securing a sustainable future for the oceans. Uptake of this review's recommendations should reduce consumer confusion and increase confidence in the benefits of sustainable purchasing.
{"title":"Behind the Signs—A Global Review of Fish Sustainability Information Schemes","authors":"G. Parkes, James A. Young, S. Walmsley, R. Abel, J. Harman, P. Horvát, A. Lem, A. Macfarlane, Maarten Mens, Conor Nolan","doi":"10.1080/10641262.2010.516374","DOIUrl":"https://doi.org/10.1080/10641262.2010.516374","url":null,"abstract":"This article presents the results of a global review of organizations that provide sustainable fisheries information—including ecolabels, recommendation lists, and supermarkets—to consumers and supply chain intermediaries. It examined 17 organizations and key supermarkets that communicate on the sustainability of world fisheries and aquaculture products. Certification schemes assess a relatively small number of specific fisheries and indicate sustainability through labels. Recommendation lists cover more species and areas but in less detail. Most schemes showed improving conformance with FAO guidelines for fisheries and aquaculture certification. However, significant variation in fisheries’ assessment exists, calling into question the accuracy and precision of information and advice provided. Inconsistent approaches and contradictory advice among certification schemes and recommendation lists potentially increase consumer confusion and reduce their credibility. The review identifies seven critical attributes that schemes must address—scope, accuracy, independence, precision, transparency, standardization, and cost-effectiveness—and recommends that certification schemes and recommendation lists enhance their consistency and credibility through compliance with these attributes and FAO guidelines. Fish sustainability information schemes play an important role in securing a sustainable future for the oceans. Uptake of this review's recommendations should reduce consumer confusion and increase confidence in the benefits of sustainable purchasing.","PeriodicalId":49627,"journal":{"name":"Reviews in Fisheries Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2010-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10641262.2010.516374","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59679831","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-10-06DOI: 10.1080/10641262.2010.513020
A. Parsons, J. Skalski
Most reviews of salmonid escapement estimation techniques have been based on logistical considerations or site-specific applications and not on statistical first principles. We reviewed six categories of salmon escapement techniques: area-under-the-curve, carcass abundance, mark-recapture, passage count, peak count, and redd count methods, based on statistical accuracy (i.e., unbiasedness), precision, and the ability to meet model assumptions. Within each of these categories of escapement techniques, we make recommendations on the best approaches to use for valid estimates and suggest five considerations when selecting an escapement estimation method. Currently in the Pacific Northwest, peak spawner counts are the most commonly employed technique and least defensible on a statistical basis than other methods. We recommend statistical accuracy and precision be given higher consideration when monitoring often increasingly scarce salmon resources.
{"title":"Quantitative Assessment of Salmonid Escapement Techniques","authors":"A. Parsons, J. Skalski","doi":"10.1080/10641262.2010.513020","DOIUrl":"https://doi.org/10.1080/10641262.2010.513020","url":null,"abstract":"Most reviews of salmonid escapement estimation techniques have been based on logistical considerations or site-specific applications and not on statistical first principles. We reviewed six categories of salmon escapement techniques: area-under-the-curve, carcass abundance, mark-recapture, passage count, peak count, and redd count methods, based on statistical accuracy (i.e., unbiasedness), precision, and the ability to meet model assumptions. Within each of these categories of escapement techniques, we make recommendations on the best approaches to use for valid estimates and suggest five considerations when selecting an escapement estimation method. Currently in the Pacific Northwest, peak spawner counts are the most commonly employed technique and least defensible on a statistical basis than other methods. We recommend statistical accuracy and precision be given higher consideration when monitoring often increasingly scarce salmon resources.","PeriodicalId":49627,"journal":{"name":"Reviews in Fisheries Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2010-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10641262.2010.513020","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59679757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-09-15DOI: 10.1080/10641262.2010.509520
C. Mylonas, F. de la Gándara, A. Corriero, A. B. Ríos
The Atlantic bluefin tuna (Thunnus thynnus) is one of the tunas with the highest commercial value and it is supporting the capture-based tuna aquaculture industry in the Mediterranean Sea. This is a seasonal activity and it involves the capture of fish from the wild and their rearing in sea cages for periods ranging between 3 months to 2 years. Short-term rearing is done mainly to: (a) achieve a greater body fat percentage and (b) obtain a better price by not flooding the market in the brief fishing period. Due to the increasing fear of a collapse of the fishery, the International Commission for the Conservation of Atlantic Tunas currently reduced the total allowable catches for 2010 to 13,500 mtn from 32,000 mtn previously. Therefore, there is great interest in establishing a proper and sustainable tuna aquaculture industry. This necessitates the development of specific technologies for tuna aquaculture that will not rely on captured individuals from the wild, as it is practiced today. This article reviews the methods used for the farming and fattening of the species in the Mediterranean Sea, and the current status of the efforts at controlling reproduction in captivity.
{"title":"Atlantic Bluefin Tuna (Thunnus Thynnus) Farming and Fattening in the Mediterranean Sea","authors":"C. Mylonas, F. de la Gándara, A. Corriero, A. B. Ríos","doi":"10.1080/10641262.2010.509520","DOIUrl":"https://doi.org/10.1080/10641262.2010.509520","url":null,"abstract":"The Atlantic bluefin tuna (Thunnus thynnus) is one of the tunas with the highest commercial value and it is supporting the capture-based tuna aquaculture industry in the Mediterranean Sea. This is a seasonal activity and it involves the capture of fish from the wild and their rearing in sea cages for periods ranging between 3 months to 2 years. Short-term rearing is done mainly to: (a) achieve a greater body fat percentage and (b) obtain a better price by not flooding the market in the brief fishing period. Due to the increasing fear of a collapse of the fishery, the International Commission for the Conservation of Atlantic Tunas currently reduced the total allowable catches for 2010 to 13,500 mtn from 32,000 mtn previously. Therefore, there is great interest in establishing a proper and sustainable tuna aquaculture industry. This necessitates the development of specific technologies for tuna aquaculture that will not rely on captured individuals from the wild, as it is practiced today. This article reviews the methods used for the farming and fattening of the species in the Mediterranean Sea, and the current status of the efforts at controlling reproduction in captivity.","PeriodicalId":49627,"journal":{"name":"Reviews in Fisheries Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2010-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10641262.2010.509520","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59679720","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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