Recent trends in the distribution patterns and catch rates from trawl surveys in Lake Victoria, Tanzania

Mkumbo, O.C. (1999) Recent trends in the distribution patterns and catch rates from trawl surveys in Lake Victoria, Tanzania. In: Tweddle, D. and Cowx, I.G. (eds.) Report on third Fidawog workshop held at the Triangle Hotel, Jinja, 29 March to 1 April 1999. Jinja, Uganda, Lake Victoria Fisheries Research Project , pp. 18-29. (LVFRP Technical Document,6)

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Abstract

Trawl surveys to assess the stocks of Lake Victoria (Tanzania) for estimates of biomass and yield, together with the establishment of exploitation patterns, are being undertaken under the Lake Victoria Fisheries Research Project. Preliminary surveys to establish the sampling stations and strategy were carried out between October 1997 and February 1998. Three cruises to cover the whole of Tanzanian waters were undertaken with 133 sampling stations. Data on each rates, species composition, and distribution were collected. Three sampling areas were designated: area A, B and C. In each area, almost the same distribution pattern over depth was found. Lates niloticus (L) formed over 90% of the total catch. Most L. niloticus were from 5-40 cm TL. Abundance decreased with depth, few fish were found deeper than 40m and most fish were caught at <20 m deep. Catch rates varied considerably between stations and areas. Area A had the highest catch rates with little variation over the stations. There is an indication of recovery of species diversity compared with the surveys of RV Kiboko(1985 and 1989)

Item Type: Book Section
Title: Recent trends in the distribution patterns and catch rates from trawl surveys in Lake Victoria, Tanzania
Personal Creator/Author:
CreatorsEmail
Mkumbo, O.C.
Title of Book: Report on third Fidawog workshop held at the Triangle Hotel, Jinja, 29 March to 1 April 1999
Editors:
EditorsEmail
Tweddle, D.
Cowx, I.G.
Series Name: LVFRP Technical Document
Number: 6
Page Range: pp. 18-29
Date: 1999
Publisher: Lake Victoria Fisheries Research Project
Place of Publication: Jinja, Uganda
Projects: Lake Victoria Fisheries Research Project Phase II
Institution: Lake Victoria Fisheries Research Project Phase II
Issuing Agency: Lake Victoria Fisheries Organization
Additional Information: LVFRP/TECH/99/06. Fisheries Data Working Group of the Lake Victoria Fisheries Research Project (FIDAWOG)
Uncontrolled Keywords: Tanzania; Lake Victoria; biomass; catch effort; check lists; fishery surveys; geographical distribution; lake fisheries; trawling
Subjects: Fisheries
Item ID: 3755
Depositing User: Ms Maria Kalentsits
Date Deposited: 16 Mar 2011 12:03
Last Modified: 29 Sep 2011 16:58
Related URLs:
URI: http://aquaticcommons.org/id/eprint/3755

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