Fishery resource surveys: beyond length-weight relationship models

Okorie, P.U. (2005) Fishery resource surveys: beyond length-weight relationship models. In: 19th Annual Conference of the Fisheries Society of Nigeria (FISON) , 29 Nov - 03 Dec 2004 ,Ilorin, Nigeria, pp. 620-623.

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Abstract

Fisheries resource surveys are regular management tools for rational exploitation of commercial fisheries. In a growing number of cases, the use of these resource surveys has been largely restricted to assessment of the relative well being of fish stocks and the potential yields of such fisheries. This paper seeks to demonstrate that the data from such surveys can also be easily used to evaluate species diversity of such fisheries, both in terms of species richness and equitability of distribution. Using published data on two freshwater and two marine fisheries as case studies, Shannon-Wiener Diversity Function and Simpson's Index were computed for each of these fisheries. These biodiversity indices gave a deeper insight into the environmental status of each of these fisheries, beyond what the length-weight relationship models can reveal. Generally, while the marine fisheries showed more species richness, the freshwater fisheries apparently had more stable and equilibrated fish communities

Item Type: Conference or Workshop Item
Title: Fishery resource surveys: beyond length-weight relationship models
Personal Creator/Author:
CreatorsEmail
Okorie, P.U.
Page Range: pp. 620-623
Date: 2005
Event Title: 19th Annual Conference of the Fisheries Society of Nigeria (FISON)
Event Type: Conference
Event Location: Ilorin, Nigeria
Event Dates: 29 Nov - 03 Dec 2004
Issuing Agency: Fisheries Society of Nigeria
Uncontrolled Keywords: Nigeria; fishery surveys; length-weight relationships; species diversity
Subjects: Fisheries
Biology
Item ID: 4087
Depositing User: Ms Maria Kalentsits
Date Deposited: 31 Aug 2010 13:17
Last Modified: 29 Sep 2011 16:31
Related URLs:
URI: http://aquaticcommons.org/id/eprint/4087

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