Manual de Metodos Para la Evaluacion de Los Stocks de Peces PDF Download
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Author: R. J. H. Beverton
Publisher:
ISBN:
Category : Fish populations
Languages : en
Pages : 348
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Book Description
Author: R. J. H. Beverton
Publisher:
ISBN:
Category : Fish populations
Languages : en
Pages : 348
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Book Description
Author: Daniel Pauly
Publisher: Food & Agriculture Org.
ISBN: 9789251013335
Category : Pets
Languages : en
Pages : 72
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Book Description
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:
Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 88
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Book Description
Author: Per Sparre
Publisher: Food & Agriculture Org.
ISBN: 9789251025949
Category : Nature
Languages : en
Pages : 232
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Book Description
Author: J.A. Pope
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: W. B. Hall
Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 52
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Book Description
Author: J. F. Caddy
Publisher: Food & Agriculture Org.
ISBN: 9789251025109
Category : Nature
Languages : en
Pages : 166
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Book Description
The text is intended as supplementary reading for fisheries workers, especially in developing countries, who do not always have ready access to current literature on applied marine ecology. An attempt is made to develop a wide range of concepts in a form that will hopefully encourage their incorporation into a practical, decision-making context. The food web and associated trophic interactions form the principal theme, in an approach that gives equal emphasis to qualitative, as well as the less easily measured quantitative considerations. An attempt is made to illustrate the consequences of the aggregated nature of much of marine production, as well as the subsequent dispersal of production in space and time, and how these processes affect the potential for economic harvest of commercial components of the ecosystem. Separate sections touch on environmental influences on production, relevant spatial and temporal scales for ecosystem analysis, life history strategies, diversity and stability, the concepts of the ecological niche, the community and the assemblage, and outline some first steps towards quantifiying production in marine ecosystems. Different approaches to representing trophic and other interactions are discussed, with examples from the literature. Reference is made to several ecological subsystems, in order to illustrate the main concepts presented. These include the mangrove ecosystem, the arcto-boreal macrophyte community, a mediterranean demersal fish assemblage, and the oceanic ecosystem associated with high seas tuna stocks. In practical terms, it is concluded that the first and simplest approach to multispecies resource management is not necessarily the manipulation of individual food web components, but the identification, mapping and conservation of critical habitats, especially centres of local production, and their associated ecological dissipation structures.
Author:
Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 86
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Book Description
Author: Per Sparre
Publisher: Food & Agriculture Organization of the UN (FAO)
ISBN:
Category : Pets
Languages : en
Pages : 436
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Book Description
In Part 1, Manual, a selection of methods on fish stock assessment is described in detail, with examples of calculations. Special emphasis is placed on methods 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 age-based and length-based cohort analysis, gear selectivity, sampling, prediction models, including Beverton and Holt's yield per recruit model and Thompson and Bell's model, surplus production models, multispecies and multifleet problems, the assessment of migratory stocks, a discussion on stock/recruitment relationships and demersal trawl surveys, including the swept-area method. The manual is completed with a review of stock assessment, where an indication is given of methods to be applied at different levels of availability of input data, a review of relevant computer programs produced by or in cooperation with FAO, and a list of references, including material for further reading. In Part 2, Exercises, a number of exercises is given with solutions. The exercises are directly related to the various chapters and sections of the manual.
Author: J. F. Caddy
Publisher: Food & Agriculture Org.
ISBN: 9789250026770
Category : Law
Languages : en
Pages : 320
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Book Description
