Studies of Age-Determination in Fish PDF Download
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Author: Godfrey Michael GRAHAM
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Godfrey Michael GRAHAM
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Food and Agriculture Organization of the United Nations
Publisher: Food & Agriculture Org.
ISBN: 9251311765
Category : Technology & Engineering
Languages : en
Pages : 196
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Book Description
This handbook provides guidance on methods for use in fish ageing studies. Fish age, among other biological parameters, is one of the most relevant pieces of data to attain sustainable exploitation levels of fishery resources. Indeed, most analytical methods used in stock assessment require knowledge of demographic structure according to age of stocks, as well as to recruitment, growth, maturity, natural mortality, etc., which are strictly linked to information on age and age structure. The handbook was put together to deal with identified gaps – which affect both the precision and the accuracy of estimations – regarding ageing schemes, criteria and methodologies used in preparing calcified structures. It focuses on the general principles that underpin age analysis (assignment of birth date, preparation methods, aging scheme reading and identification of true and false rings). Crucially, it aims to contribute to the establishment of common analysis methods, which can enable better calibration across the diverse institutes involved, thereby improving the quality and reliability of results.
Author: Michael Carl Quist
Publisher:
ISBN: 9781934874486
Category : Fishes
Languages : en
Pages : 359
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Author: Godfrey Michael GRAHAM
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Michael Graham
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 0
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Author:
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 50
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Author: Nina Ivanovna Chugunova
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 144
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Author: Godfrey Michael GRAHAM
Publisher:
ISBN:
Category : Codfish
Languages : en
Pages :
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Author: Mary Elizabeth Matta
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 114
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Book Description
The Age and Growth Program at the Alaska Fisheries Science Center is tasked with providing age data in order to improve the basic understanding of the ecology and fisheries dynamics of Alaskan fish species. The primary focus of the Age and Growth Program is to estimate ages from otoliths and other calcified structures for age-structured modeling of commercially exploited stocks; however, the program has recently expanded its interests to include numerous studies on topics ranging from age estimate validation to the growth and life-history of non-target species. Because so many applications rely upon age data and particularly upon assurances as to their accuracy and precision, the Age and Growth Program has developed this practical guide to document the age determination of key groundfish species from Alaskan waters. The main objective of this manual is to describe techniques specific to the age determination of commercially and ecologically important species studied by the Age and Growth Program. The manual also provides general background information on otolith morphology, dissection, and preparation, as well as descriptions of methods used to measure precision and accuracy of age estimates. This manual is intended not only as a reference for age readers at the AFSC and other laboratories, but also to give insight into the quality of age estimates to scientists who routinely use such data.
Author: Roman Sych
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 80
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