Preliminary observations on the use of a frame trawl in hydroacoustic surveys
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
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| Main Authors: | , |
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| Format: | book_section biblioteca |
| Language: | English |
| Published: |
Fisheries Data Working Group of the Lake Victoria Fisheries Research Project
1999
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| Subjects: | Fisheries, Uganda, Lake Victoria, catch composition, catch/effort, echo surveys, fishery surveys, lake fisheries, midwater trawls, trawl nets, Caridina niloticus, Rastrineobola argentea, |
| Online Access: | http://hdl.handle.net/1834/21444 |
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