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Estimation Of Tuna Fishing Capacity From Stock Assessment Related Information
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Author :William H. Bayliff Publisher :Food & Agriculture Organization of the UN (FAO) ISBN 13 : Total Pages :68 pages Book Rating :4.:/5 (319 download)
Book Synopsis Estimation of Tuna Fishing Capacity from Stock Assessment-related Information by : William H. Bayliff
Download or read book Estimation of Tuna Fishing Capacity from Stock Assessment-related Information written by William H. Bayliff and published by Food & Agriculture Organization of the UN (FAO). This book was released on 2009 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experience has shown that a basic prerequisite for successful mechanization of the agricultural sector requires a well-functioning supply chain. To draw lessons for achieving this goal, the FAO Rural Infrastructure and Agro-Industries Division commissioned three mechanization supply chain case studies. The studies were conducted in Kenya, Paksitan and Brazil, and the information contained in them has been used as the basis for the analysis presented in this Technical Report. The main recommendations of this title are aimed at policy-makers in the public sector, although there is plenty to interest other stakeholders, especially machinery suppliers and mechanization service providers. However, the ultimate beneficiaries are small- and medium-scale farmers who are the recipients of the services provided.
Book Synopsis Methodological Workshop on the Management of Tuna Fishing Capacity by : W. H. Bayfiff
Download or read book Methodological Workshop on the Management of Tuna Fishing Capacity written by W. H. Bayfiff and published by Food & Agriculture Org.. This book was released on 2007 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: Organized by FAO's Japan-funded Project "Management of tuna fishing capacity: conservation and socio-economics" and formulated with the aim of improving the management of tuna fisheries on a global scale. Its immediate objectives are to provide the technical information necessary for the management of tuna fishing capacity and resolve the associated technical on a global scale, taking into account conservation and socio-economic issues.
Book Synopsis Improving Stock Assessments and Management Advice for Bluefin Tunas and Other Highly Migratory Species by : Lisa Elma Ailloud
Download or read book Improving Stock Assessments and Management Advice for Bluefin Tunas and Other Highly Migratory Species written by Lisa Elma Ailloud and published by . This book was released on 2018 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: For years bluefin tuna has been the poster child for overfishing and poor management. However, recent improvements in data collection, catch monitoring and international cooperation are providing an opportunity to reverse the perception of a fishery that is doomed to collapse. Stock assessments are conducted routinely to monitor the abundance and productivity of exploited fish stocks so managers can determine how many fish can be sustainably harvested each year. Should a stock be declared overfished or under-going overfishing, the science behind stock assessments also equip managers with the knowledge necessary to make decisions about what short-term and long-term management measures should be taken to help reverse these trends. in that light, the goal of my research has been to use newly available age data to improve the quality and reliability of assessments for Atlantic bluefin tuna by reducing uncertainty about the data and methods used to infer growth and age composition. A secondary goal has been to provide managers with the knowledge necessary to implement effective stock rebuilding programs for Pacific bluefin tuna. Chapter 2 is focused on cohort slicing, a method routinely used in the Atlantic bluefin tuna assessment to estimate catch-at-age from catch-at-size information. This chapter explores how errors in cohort sliced catch-at-age data can bias estimates of total mortality rate derived from catch curve analysis. Recommendations are provided concerning the appropriate mortality estimator and plus group to use depending on the parameters characterizing the stock. Chapter 3 provides updated growth estimates for western Atlantic bluefin tuna, which were adopted in 2017 as the basis for defining growth in the assessment. Chapter 4 provides an overview of the theory behind age-length keys with particular emphasis on the assumptions that govern each method and provides notes of caution concerning their applications to real data. Chapter 5 evaluates through simulation the relative performance of different methods for estimating age composition of western Atlantic bluefin tuna catches and applies the best performing technique, the combined forward-inverse age-length key, to actual western Atlantic bluefin tuna data. Chapter 6 moves over to the Pacific and focuses on evaluating the potential impacts of different minimum size regulations on the stock of Pacific bluefin tuna and explores ways in which to minimize short-term pain to the industry while still achieving long-term yield and conservation goals. Overall, this work has contributed major improvements to the stock assessment process of Atlantic bluefin tuna and implications of this work resonate beyond the bluefin tuna world to other highly migratory species faced with similar problems.
Book Synopsis Stock Assessment for Fishery Management by : Daniel D. Hoggarth
Download or read book Stock Assessment for Fishery Management written by Daniel D. Hoggarth and published by Food & Agriculture Org.. This book was released on 2006 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication contains guidelines for fish stock assessment and fishery management using the software tools and other outputs developed by the UK Department for International Development's Fisheries Management Science Programme (FMSP) from 1992 to 2004. It includes a CD-ROM with the installation files for each of the four FMSP software tools: LFDA (Length Frequency Data Analysis), CEDA (Catch Effort Data Analysis), YIELD and ParFish (Participatory Fisheries Stock Assessment).
Book Synopsis On the Dynamics of Exploited Fish Populations by : Raymond J.H. Beverton
Download or read book On the Dynamics of Exploited Fish Populations written by Raymond J.H. Beverton and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 541 pages. Available in PDF, EPUB and Kindle. Book excerpt: Among the fishes, a remarkably wide range of biological adaptations to diverse habitats has evolved. As well as living in the conventional habitats of lakes, ponds, rivers, rock pools and the open sea, fish have solved the problems of life in deserts, in the deep sea, in the cold antarctic, and in warm waters of high alkalinity or of low oxygen. Along with these adaptations, we find the most impressive specializations of morphology, physiology and behaviour. For example we can marvel at the high-speed swimming of the marlins, sailfish and warm-blooded tunas, air-breathing in catfish and lungfish, parental care in the mouth-brooding cichlids, and viviparity in many sharks and toothcarps. Moreover, fish are of considerable importance to the survival of the human species in the form of nutritious, delicious and diverse food. Rational exploitation and management of our global stocks of fishes must rely upon a detailed and precise insight of their biology. The Chapman & Hall Fish and Fisheries Series aims to present timely volumes reviewing important aspects of fish biology. Most volumes will be of interest to research workers in biology, zoology, ecology and physiology but an additional aim is for the books to be accessible to a wide spectrum of non-specialist readers ranging from undergraduates and postgraduates to those with an interest in industrial and commercial aspects of fish and fisheries.
Book Synopsis Risk Evaluation and Biological Reference Points for Fisheries Management by : National Research Council Canada
Download or read book Risk Evaluation and Biological Reference Points for Fisheries Management written by National Research Council Canada and published by NRC Research Press. This book was released on 1993 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: Papers presented: 1) Reference points for fisheries management: the western Canadian experience; 2) Reference points for fisheries management: the eastern Canadian experience; 3) Reference points for fisheries management: the ICES experience; 4) Spawning stock biomass per recruit in fisheries management: foundation and current use; 5) The development of a management procedure for the South African anchovy resource; 6) How much spawning per recruit is enough?; 7) The behaviour of Flow, Fmed and Fhigh in response to variation in parameters used for their estimation; 8) The Barents Sea capelin stock collapse: a lesson to learn; 9) Variance estimates for fisheries assessment: their importance and how best to evaluate them; 10) Evaluating the accuracy of projected catch estimates from sequential population analysis and trawl survey abundance estimates; 11) Bootstrap estimates of ADAPT parameters, their projection in risk analysis and their retrospective patterns; 12) Analytical estimates of reliability for the projected yield from commercial fisheries; 13) Risk evaluation of the 10% harvest rate procedure for capelin in NAFO Division 3L; 14) Using jackknife and Monte Carlo simulation techniques to evaluate forecast models for Atlantic salmon; 15) Monte Carlo evaluation of risks for biological reference points used in New Zealand fishery assessments; 16) A comparison of event free risk analysis to Ricker spawner-recruit simulation: an example with Atlantic menhaden; 17) Choosing a management strategy for stock rebuilding when control is uncertain; 18) Risks and uncertainties in the management of a single-cohort squid fishery: the Falkland Islands Illex fishery as an example; 19) Risks of over- and under-fishing new resources; 20) Estimation of density-dependent natural mortality in British Columbia herring stocks through SSPA and its impact on sustainable harvesting strategies; 21) The comparative performance of production-model and ad hoc tuned VPA based feedback-control management procedures for the stock of Cape hake off the west coast of Africa; 22) A proposal for a threshold stock size and maximum fishing mortality rate; 23) Biological reference points for Canadian Atlantic gadoid stocks; 24) Stochastic locally-optimal harvesting; 25) ITQ based fisheries management; 26) Bioeconomic methods for determining TACs; 27) Management strategies: fixed or variable catch quotas; 28) Bioeconomic impacts of TAC adjustment strategies: a model applied to northern cod; 29) Experimental management programs for two rockfish stocks off British Columbia; 30)A brief overview of the experimental approach to reducing uncertainty in fisheries management; 31) Fisheries management organizations: a study of uncertainty.
Book Synopsis Fish Stock Assessment Manual by : Emygdio L. Cadima
Download or read book Fish Stock Assessment Manual written by Emygdio L. Cadima and published by Food & Agriculture Org.. This book was released on 2003 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: This manual examines mathematical models applied in fish stock assessment, including models and variation rates; cohort models and analyses; stock fishing patterns, components, stock-recruitment relations, short- and long-term stock projections; fisheries resources management with regards to biological reference points and regulation measures; production models; estimation of parameters; and exercises.
Book Synopsis Improving Fish Stock Assessments by : National Research Council
Download or read book Improving Fish Stock Assessments written by National Research Council and published by National Academies Press. This book was released on 1998-02-27 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ocean harvests have plateaued worldwide and many important commercial stocks have been depleted. This has caused great concern among scientists, fishery managers, the fishing community, and the public. This book evaluates the major models used for estimating the size and structure of marine fish populations (stock assessments) and changes in populations over time. It demonstrates how problems that may occur in fisheries dataâ€"for example underreporting or changes in the likelihood that fish can be caught with a given type of gearâ€"can seriously degrade the quality of stock assessments. The volume makes recommendations for means to improve stock assessments and their use in fishery management.
Book Synopsis Stock Status and Management in Tuna Fisheries by : Maite Pons
Download or read book Stock Status and Management in Tuna Fisheries written by Maite Pons and published by . This book was released on 2018 with total page 165 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tunas and billfishes are large migratory species managed by Regional Fisheries Management Organizations (tRFMOs). The current status of these species is well known, and most of the large commercial tuna stocks are managed at sustainable levels. We found that most of the overfished tuna and billfish populations are showing signs of rebuilding as a consequence of the implementation of strong management measures such as fishing quotas. However, management performance among tRFMOs is highly variable among oceans and it is mainly correlated with the overall economic dependence of individual members of the tRFMOs on tuna fisheries. When countries with low governance capacity account for the greatest proportion of total tuna catches, management controls are, on average, harder to implement. On the other hand, some non-commercial valuable tuna stocks, such as mackerels and bonitos, managed under the umbrella of tRFMOs remain unassessed, mainly because of insufficient quantitative data, particularly total catch. Preliminary assessments for these stocks based only on length composition data from the catch, showed that some of these stocks are experiencing overfishing. These results should encourage the management body in the Atlantic Ocean to take management actions to protect these stocks from overfishing as well as improve data collection programs. When comparing the performance of some length-based and catch-based data limited assessment methods, we found that in many cases, length-based assessments performed as well as other catch-based models. Nevertheless, the performance of different data-limited methods depended not only on the type of data available, but on prior knowledge about the exploitation history of the stock and the biology of each species. We hope that this dissertation helps to improve the current management system for data-rich tuna stocks by highlighting successful management strategies, as well as to improve the estimation of stock status for data-poor tuna fisheries.
Book Synopsis The Future of Fisheries Science in North America by : Richard J. Beamish
Download or read book The Future of Fisheries Science in North America written by Richard J. Beamish and published by Springer Science & Business Media. This book was released on 2009-02-07 with total page 736 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fisheries science in North America is changing in response to a changing climate, new technologies, an ecosystem approach to management and new thinking about the processes affecting stock and recruitment. Authors of the 34 chapters review the science in their particular fields and use their experience to develop informed opinions about the future. Everyone associated with fish, fisheries and fisheries management will find material that will stimulate their thinking about the future. Readers will be impressed with the potential for new discoveries, but disturbed by how much needs to be done in fisheries science if we are to sustain North American fisheries in our changing climate. Officials that manage or fund fisheries science will appreciate the urgency for the new information needed for the stewardship of fish populations and their ecosystems. Research organizations may want to keep some extra copies for a future look back into the thoughts of a wide range of fisheries professionals. Fisheries science has been full of surprises with some of the surprises having major economic impacts. It is important to minimize these impacts as the demand for seafood increases and the complexities of fisheries management increase.
Book Synopsis A Summary of Current Information on the Biology, Fisheries and Stock Assessment of Bigeye Tuna (Thunnus Obesus) in the Pacific Ocean, with Recommendations for Data Requirements and Future Research by : John Hampton
Download or read book A Summary of Current Information on the Biology, Fisheries and Stock Assessment of Bigeye Tuna (Thunnus Obesus) in the Pacific Ocean, with Recommendations for Data Requirements and Future Research written by John Hampton and published by . This book was released on 1998 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Stock Identification Methods by : Steven X. Cadrin
Download or read book Stock Identification Methods written by Steven X. Cadrin and published by Academic Press. This book was released on 2013-10-04 with total page 589 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stock Identification Methods, 2e, continues to provide a comprehensive review of the various disciplines used to study the population structure of fishery resources. It represents the worldwide experience and perspectives of experts on each method, assembled through a working group of the International Council for the Exploration of the Sea. The book is organized to foster interdisciplinary analyses and conclusions about stock structure, a crucial topic for fishery science and management. Technological advances have promoted the development of stock identification methods in many directions, resulting in a confusing variety of approaches. Based on central tenets of population biology and management needs, this valuable resource offers a unified framework for understanding stock structure by promoting an understanding of the relative merits and sensitivities of each approach. - Describes 18 distinct approaches to stock identification grouped into sections on life history traits, environmental signals, genetic analyses, and applied marks - Features experts' reviews of benchmark case studies, general protocols, and the strengths and weaknesses of each identification method - Reviews statistical techniques for exploring stock patterns, testing for differences among putative stocks, stock discrimination, and stock composition analysis - Focuses on the challenges of interpreting data and managing mixed-stock fisheries
Book Synopsis Manual of Methods for Fish Stock Assessment by :
Download or read book Manual of Methods for Fish Stock Assessment written by and published by . This book was released on 1969 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Some Simple Methods for the Assessment of Tropical Fish Stocks by : Daniel Pauly
Download or read book Some Simple Methods for the Assessment of Tropical Fish Stocks written by Daniel Pauly and published by Food & Agriculture Org.. This book was released on 1983 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: This selection of methods is based on lecture notes used at a FAO/DANIDA training course held in Mombasa, Kenya, in May-June 1980. The methods presented are: regression and correlation, estimation of growth parameters from length-frequency data, estimation of mortalities (total, natural, fishing mortality) and analysis of catch and effort data. A brief annotated bibliography of tropical fish stock assessment is included.
Author :Food and Agriculture Organization of the United Nations Publisher :Food & Agriculture Org. ISBN 13 :9789251052976 Total Pages :356 pages Book Rating :4.0/5 (529 download)
Book Synopsis Second Meeting of the Technical Advisory Committee of the FAO Project Management of Tuna Fishing Capacity: Conservation and Socio-economics by : Food and Agriculture Organization of the United Nations
Download or read book Second Meeting of the Technical Advisory Committee of the FAO Project Management of Tuna Fishing Capacity: Conservation and Socio-economics written by Food and Agriculture Organization of the United Nations and published by Food & Agriculture Org.. This book was released on 2005 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication contains papers relating to the FAO project on tuna fisheries management. Topics discussed include: the development of tuna fisheries and resources, trends in tuna catches and market influences, the status of tuna stocks, fishing capacity of industrial tuna purse-seine and longline fleets, a global study of non-industrial tuna fisheries, problems of illegal, unreported and unregulated fishing and overcapacity of tuna fishing vessels.
Book Synopsis An Assessment of Atlantic Bluefin Tuna by : National Research Council
Download or read book An Assessment of Atlantic Bluefin Tuna written by National Research Council and published by National Academies Press. This book was released on 1994-02-01 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reviews and evaluates the scientific basis of U.S. management of fisheries for Atlantic bluefin tuna. In particular, it focuses on the issues of stock structure and stock assessments used by the National Oceanic and Atmospheric Administration's National Marine Fisheries Service for management under the International Convention for the conservation of Atlantic Tunas.
Book Synopsis Methodological Workshop on the Management of Tuna Fishing Capacity by : Jacek Majkowski
Download or read book Methodological Workshop on the Management of Tuna Fishing Capacity written by Jacek Majkowski and published by . This book was released on 2007 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
