Results of the first hydroacoustic survey of the Ugandan waters of Lake Victoria

Tumwebaze, R. and Getabu, A. (1999) Results of the first hydroacoustic survey of the Ugandan waters of Lake Victoria. In: Tweddle, D. and Cowx, I.G. (eds.) Report on third Fisheries Data Working Group (FIDAWOG) workshop held at the Triangle Hotel, Jinja, 29 March to 1 April 1999. Jinja, Fisheries Data Working Group of the Lake Victoria Fisheries Research Project, pp. 91-97. (LVFRP Technical Document,6)

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Abstract

A lakewide hydroacoustic research programme was designed in the Ugandan waters of Lake Victoria in order to ascertain the status of fish stocks. Data obtained from the hydroacoustic surveys were complemented with by catch data from multi mesh gillnets and frame trawls to validate acoustic estimates. Fish were distributed over the whole survey area, though the densities and species composition varied from place to place. Echo traces showed the fish formed schools during daytime and became more dispersed towards evening. Approximately equivalent indices of abundance were estimated for Rastrineobola argentea and Haplocromines. The distribution of the freshwater prawn, Caridina nilotica and the lakefly Chaoborus sp. was patchy. Dense swarms of Chaoborus larvae were observed to disperse from the lake bottom as the night approached thus assuring echo-traces formed by fish on the echogram and making their interpretation difficult. Caridina nilotica were observed to form dense echo-traces at the thermocline

Item Type: Book Section
Title: Results of the first hydroacoustic survey of the Ugandan waters of Lake Victoria
Personal Creator/Author:
CreatorsEmail
Tumwebaze, R.
Getabu, A.
Title of Book: Report on third Fisheries Data Working Group (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. 91-97
Date: 1999
Publisher: Fisheries Data Working Group of the Lake Victoria Fisheries Research Project
Place of Publication: Jinja
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
Uncontrolled Keywords: Uganda, Lake Victoria; acoustic data; catch composition; echo surveys; fishery surveys; gillnets; inland fisheries; species diversity; stocks; thermocline; trawl nets; Caridina nilotica; Chaoborus
Subjects: Fisheries
Item ID: 3750
Depositing User: Ms Maria Kalentsits
Date Deposited: 14 Jul 2010 06:56
Last Modified: 29 Sep 2011 16:57
URI: http://aquaticcommons.org/id/eprint/3750

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