Preliminary observations on the use of a frame trawl in hydroacoustic surveys

Tweddle, D. and Bassa, S. (1999) Preliminary observations on the use of a frame trawl in hydroacoustic surveys. 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. 98-104. (LVFRP Technical Document,6)

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Abstract

Thirteen hauls were made during the hydroacoustic survey of the Ugandan waters of Lake Victoria from 7-19 February 1999. Ten of the hauls were made above the oxycline which was clearly visible as a strong echo on the echogram at between 25 and 35 m depth in most of the sampled areas. The remaining three hauls targeted the oxycline. Approximate equal weights of Rastrineobola argentia and Haplocromine cichlids were caught in total, but with marked differences between hauls. Near the surface R. argentia dominated the catches. In midwater Haplochromines were dominant. At the oxycline Caridina niloticus was abundant

Item Type: Book Section
Title: Preliminary observations on the use of a frame trawl in hydroacoustic surveys
Personal Creator/Author:
CreatorsEmail
Tweddle, D.
Bassa, S.
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. 98-104
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; catch composition; catch/effort; echo surveys; fishery surveys; lake fisheries; midwater trawls; trawl nets; Caridina niloticus; Rastrineobola argentea
Subjects: Fisheries
Item ID: 3757
Depositing User: Ms Maria Kalentsits
Date Deposited: 13 Jul 2010 10:42
Last Modified: 29 Sep 2011 16:58
Related URLs:
URI: http://aquaticcommons.org/id/eprint/3757

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