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Author: Michael Carl Quist
Publisher:
ISBN: 9781934874486
Category : Fishes
Languages : en
Pages : 359
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Book Description
Author: Michael Carl Quist
Publisher:
ISBN: 9781934874486
Category : Fishes
Languages : en
Pages : 359
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Book Description
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: D. E. Chilton
Publisher: Government of Canada, Fisheries and Oceans, Scientific Information and Publications Branch
ISBN:
Category : Fishes
Languages : en
Pages : 116
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Book Description
This manual describes methods and equipment used to estimate the ages of groundfish species studied by the Pacific Biological Station. Procedures for routine identification of annuli on scales, otoliths, otolith section, fin-ray sections, and spines are described and illustrated. Although the techniques are applied to species found off Canada's west coast, they should be applicable to other marine and freshwater fishes from temperate and arctic waters. Because some of the procedures are experimental and many have not been validated, it is expected that this manual will be revised several times.
Author: Fred E. Lux
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 10
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Book Description
Author: Smithsonian Institution. Science Information Exchange
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages :
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Book Description
Author: Roman Sych
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 80
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Book Description
Author: Hiroaki Aikawa
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 24
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Book Description
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:
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 10
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Book Description
Author: David C. Smith
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 476
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Book Description
