Length Based Methods In Fisheries Research

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Length Based Methods In Fisheries Research

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Author : Daniel Pauly
language : en
Publisher: WorldFish
Release Date : 1987

Length Based Methods In Fisheries Research written by Daniel Pauly and has been published by WorldFish this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Fisheries categories.

Specific aims of the conference were: to identify the specific features of sampling schemes used to obtain length-frequency data for stock assessment; to review length-based methodologies for stock assessment of fish and aquatic invertebrates, with particular reference to their precision and accuracy; to review and test computer programs implementing length-based methods.

The Accuracy Of Some Length Based Methods For Fish Population Studies

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Author : Victoria J. Isaac
language : en
Publisher: WorldFish
Release Date : 1990

The Accuracy Of Some Length Based Methods For Fish Population Studies written by Victoria J. Isaac and has been published by WorldFish this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Fish populations categories.

A Review Of Length Based Approaches To Assessing Fish Stocks

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Author : J. A. Gulland
language : en
Publisher: Food & Agriculture Org.
Release Date : 1992

A Review Of Length Based Approaches To Assessing Fish Stocks written by J. A. Gulland and has been published by Food & Agriculture Org. this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Technology & Engineering categories.

This document reviews the several fish stock assessment methods based on length-frequency analysis. Emphasis is placed on sampling and collection of length-frequency data, to the estimation of population parameters such as growth, mortality and recruitment and the estimation of catch selectivity. Attention is given to the conversion of length to age using age-length keys, slicing length-frequency composition, and using modes. It reviews long-and short-term effects of changes in selection and fishing mortality, and discusses methods for long-term assessments and for short-term projections. The manual gives several examples of the most common methods used and stresses the advantages of using personal computers and the most recent software for data processing and analysis.

Fao Fisheries Technical Paper

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Author :
language : en
Publisher:
Release Date : 1992

Fao Fisheries Technical Paper written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Fisheries categories.

Size Based Assessment Of Data Limited Inland Fish Stocks Review And Applications

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Author : Shephard, S., Valbo-Jorgensen, J., Abadía, J., Baigún, C., Doria, C.R.C., Fabré, N.N., Isaac, V.J., Ngor, P.B., Ruffino, M.L., Funge-Smith, S.J.
language : en
Publisher: Food & Agriculture Org.
Release Date :

Size Based Assessment Of Data Limited Inland Fish Stocks Review And Applications written by Shephard, S., Valbo-Jorgensen, J., Abadía, J., Baigún, C., Doria, C.R.C., Fabré, N.N., Isaac, V.J., Ngor, P.B., Ruffino, M.L., Funge-Smith, S.J. and has been published by Food & Agriculture Org. this book supported file pdf, txt, epub, kindle and other format this book has been release on with Technology & Engineering categories.

Assessment of data-limited fish stocks is a rapidly evolving topic in marine fisheries, and is supported by an increasing focus on the socio-economic and ecological importance of small-scale fisheries. The challenges in such systems can be compounded in inland fisheries, which are often complex, spatially dispersed and difficult to monitor. This publication reviews the application of empirical indicators and simple size-based models usually used in marine fisheries, but also applicable in inland systems. It presents case study applications for important fisheries in the Amazon River (Brazil), Tonlé Sap River (Cambodia), Paraná River (Argentina) and Lago Bayano (Panama). These studies consider issues including spatial separation of life-history stages, strong modality in population size structure, and fishing gear selectivity. Local scientific experts interpreted trends in stock state. Empirical indicators showed strong decline in size structure and relative abundance for one of the four assessed Tonlé Sap stocks. The length-based spawning potential ratio model suggested that two of the three assessed Amazon Goliath catfish stocks, and the sábalo stock in the Paraná River, were below sustainable spawning potential ratio reference points. The Lago Bayano tilapia stock appeared healthy. The review concludes that data-limited assessment methods developed for marine stocks may provide guidance for the sustainable management of important target species in inland fisheries. The methods tested are probably less applicable in non-selective fisheries where small species are preferred, or in river fisheries with extreme dependence on flood pulses. Important considerations are species life history and spatial distribution, environmental variability, and fishery sampling strategy.

Fish Population Dynamics

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Author : J. A. Gulland
language : en
Publisher:
Release Date : 1988-11-17

Fish Population Dynamics written by J. A. Gulland and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988-11-17 with Nature categories.

This new edition provides updated information on population dynamics of major food fishes, and reviews the various methods used to study quantitative impacts of fishing on fish stocks. Contributors provide an historical background of the subject, then go on to cover current theories and methods of stock assessment, how these theories and methods have been applied in practice, and the effects of fisheries management on fish populations. They discuss length-based methods of stock assessment, multi-species fisheries, and provide data on fish populations in the North Atlantic, the Irish Sea, off Australia, Southeast Asia, and other regions. Completely revised and updated, including several new chapters.

Improving Fish Stock Assessments

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Author : Committee on Fish Stock Assessment Methods
language : en
Publisher: National Academies Press
Release Date : 1998-03-13

Improving Fish Stock Assessments written by Committee on Fish Stock Assessment Methods and has been published by National Academies Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998-03-13 with Technology & Engineering categories.

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 data--for example underreporting or changes in the likelihood that fish can be caught with a given type of gear--can seriously degrade the quality of stock assessments. The volume makes recommendations for means to improve stock assessments and their use in fishery management.

Handbook Of Fish Biology And Fisheries

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Author : Paul J. B. Hart
language : en
Publisher: John Wiley & Sons
Release Date : 2008-04-15

Handbook Of Fish Biology And Fisheries written by Paul J. B. Hart and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-04-15 with Technology & Engineering categories.

Recent decades have witnessed strong declines in fish stocks around the globe, amid growing concerns about the impact of fisheries on marine and freshwater biodiversity. Fisheries biologists and managers are therefore increasingly asking about aspects of ecology, behaviour, evolution and biodiversity that were traditionally studied by people working in very separate fields. This has highlighted the need to work more closely together, in order to help ensure future success both in management and conservation. The Handbook of Fish Biology and Fisheries has been written by an international team of scientists and practitioners, to provide an overview of the biology of freshwater and marine fish species together with the science that supports fisheries management and conservation. This volume, subtitled Fisheries, focuses on a wide range of topics, including the history of fisheries science, methods of capture, marketing, economics, major models used in stock assessments and forecasting, ecosystem impacts, marine protected areas and conservation. It builds on material in Volume 1, Fish Biology, which ranges from phylogenetics and biogeography to physiology, recruitment, life histories, genetics, foraging, reproductive behaviour and community ecology. Together, these books present the state of the art in our understanding of fish biology and fisheries and will serve as valuable references for undergraduates and graduates looking for a comprehensive source on a wide variety of topics in fisheries science. They will also be useful to researchers who need up-to-date reviews of topics that impinge on their fields, and decision makers who need to appreciate the scientific background for management and conservation of aquatic ecosystems. To order volume II, go to the box in the top right hand corner. Alternatively to order volume I, go to: http://www.blackwellpublishing.com/book.asp?ref=0632054123 or to order the 2 volume set, go to: http://www.blackwellpublishing.com/book.asp?ref=0632064838. Provides a unique overview of the study of fish biology and ecology, and the assessment and management of fish populations and ecosystems. The first volume concentrates on aspects of fish biology and ecology, both at the individual and population levels, whilst the second volume addresses the assessment and management of fish populations and ecosystems. Written by an international team of expert scientists and practitioners. An invaluable reference tool for both students, researchers and practitioners working in the fields of fish biology and fisheries.

Determination Of Growth In Bony Fishes From Otolith Microstructure

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Author : Beatriz Morales-Nin
language : en
Publisher: Food & Agriculture Org.
Release Date : 1992

Determination Of Growth In Bony Fishes From Otolith Microstructure written by Beatriz Morales-Nin and has been published by Food & Agriculture Org. this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Science categories.

Fish ageing methods based on growth increments in oroliths are described in detail. A short introduction describes otolith extraction, preparation and viewing techniques, emphasizing the study of microscopic daily growth increments. Light and scanning electron microscope viewing methods and criteria for interpretation are described. The need to test the findings is explained and age validation techniques described.

Fishery Bulletin

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Author :
language : en
Publisher:
Release Date : 1998

Fishery Bulletin written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Fisheries categories.