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Introduction to tropical fish stock assessment - Part 1: Manual (French version not published)












Sparre, Per.; Venema, Siebren C. Introduction to tropical fish stock assessment. Part 1. Manual. FAO Fisheries Technical Paper. No.306. Rome. FAO. 1998. 407p.


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    Book (series)
    Introduction to tropical fish stock assessment - Part 2: Excercises 1999
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    A selection of methods on fish stock assessment is described in detail, with examples of calculations. Special emphasis is placed on methods applicable to tropical fisheries, i.e. those based on the analysis of length-frequencies. After a short introduction to statistics, it covers the estimation of growth parameters and mortality rates, virtual population methods (including length and age based methods), gear selectivity, the yield per recruit model of Beverton and Holt, the estimation of maxim um sustainable yield using surplus production models, multispecies and multifleet problems, the assessment of migratory stocks, a discussion on the stock/recruitment relationship and the execution of demersal trawl surveys. The link between this manual and the length frequency stock assessment (LFSA) package of microcomputer programs is explained. The manual is completed with an extensive list of references (including material for further reading), a list of symbols used, a subject index and a n umber of exercises with solutions. Part 2 gives a number of exercises together with solutions. The exercises are directly related to the various chapters and sections of the manual.
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    Book (series)
    Introdução à avaliação de mananciais de peixes tropicales. Parte 1. Manual. (French version not published) 1997
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    Na Parte 1, o Manual, uma seleção de métodos de avaliação de mananciais é descrita com pormenor, com exemplos de cálculos. É dada ênfase especial a métodos aplicados a pescarias tropicais, isto é, aos baseados em análises de distribuição de frequências de comprimento. Depois de uma curta introdução à estatística, é feita uma abordagem da estimação dos parâmetros de crescimento e taxas de mortalidade, métodos de população virtual (incluindo métodos baseados em comprimentos e idades), selectividad e de métodos de pesca, modelo de capturas por recruta de Beverton e Holt, estimação da captura máxima sustentável usando modelos de produção geral, problemas de múltiplas espécies e frotas, avaliação de mananciais migratórios, uma discussão da relação manancial/recrutamento e a condução de levantamentos com arrasto de fundo. É explicada, ainda, a relação entre este manual e o pacote de software “Length Frequency Stock Assessment” (LFSA) para microcomputadores. Finalmente o manual apresenta uma l ista extensiva de referências incluindo material para futura leitura. Na Parte 2, Exercícios, é dado um número de exercícios com soluções. Os exercícios estão directamente relacionados com os diferentes capítulos e secções do manual.
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    Book (stand-alone)
    Fish stock assessment manual 2003
    This manual starts with an introduction to the mathematical models applied in fish stock assessment. The basic assumptions about a model and the concepts of variation rates of a characteristic in relation to time are presented. The concept of cohort and models for the individual growth of the cohort are developed. In the chapter concerning the study of the stock, the fishing pattern and its components are defined, the most used models for the stock-recruitment relation are presented, as well as the short- and long-term projections of a stock. With regard to fishing resources management, the discussion is focused on the biological reference points. Finally, the general methods of estimating parameters are described, with special relevance to the cohort analysis by age and length. Then a solution of the exercises from the last course held in IPIMAR, is presented by the author and the scientist Manuela Azevedo.

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