Introduction to Tropical Fish Stock Assessment, Bahagi 1Food and Agriculture Organization of the United Nations, 1998 - 422 mga pahina 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. |
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age group age-based age/length assumed assumption average Bell model Beverton and Holt Bhattacharya method biomass by-catch calculated column commercial fishery constant corresponding CPUE ELEFAN example Exercise(s exploited fish stock assessment fishing mortality fleet frequencies gear selection gill gill net growth curve growth parameters illustrated input data landing places length class length composition length group length-based cohort analysis length-frequency sample linear regression linearized catch curve logistic curve maximum maximum likelihood maximum sustainable yield mean length mesh migration modal progression analysis natural mortality Nemipterus japonicus Nemipterus marginatus normal distribution number caught number of fish number of survivors obtained Pauly population prediction regression analysis Section selection curve selection ogive slope spawning species spring cohort standard deviation Table Thompson and Bell total catch total number trawl tropical Upeneus vittatus variable variance virtual population analysis weight yield per recruit