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 |
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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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dig-aquadocs-1834-214442021-06-25T02:01:23Z Preliminary observations on the use of a frame trawl in hydroacoustic surveys Report on third Fisheries Data Working Group (FIDAWOG) workshop held at the Triangle Hotel, Jinja, 29 March to 1 April 1999 Tweddle, D. Bassa, S. Tweddle, D. Cowx, I.G. Fisheries Uganda Lake Victoria catch composition catch/effort echo surveys fishery surveys lake fisheries midwater trawls trawl nets Caridina niloticus Rastrineobola argentea 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 Lake Victoria Fisheries Research Project Phase II LVFRP/TECH/99/06 2021-06-24T15:55:25Z 2021-06-24T15:55:25Z 1999 book_section http://hdl.handle.net/1834/21444 en LVFRP Technical Document http://www.lvfo.org/ application/pdf application/pdf 98-104 Fisheries Data Working Group of the Lake Victoria Fisheries Research Project Jinja http://aquaticcommons.org/id/eprint/3757 424 2011-09-29 16:58:15 3757 Lake Victoria Fisheries Organization |
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| component |
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dig-aquadocs |
| tag |
biblioteca |
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Repositorio AQUADOCS |
| language |
English |
| topic |
Fisheries Uganda Lake Victoria catch composition catch/effort echo surveys fishery surveys lake fisheries midwater trawls trawl nets Caridina niloticus Rastrineobola argentea Fisheries Uganda Lake Victoria catch composition catch/effort echo surveys fishery surveys lake fisheries midwater trawls trawl nets Caridina niloticus Rastrineobola argentea |
| spellingShingle |
Fisheries Uganda Lake Victoria catch composition catch/effort echo surveys fishery surveys lake fisheries midwater trawls trawl nets Caridina niloticus Rastrineobola argentea Fisheries Uganda Lake Victoria catch composition catch/effort echo surveys fishery surveys lake fisheries midwater trawls trawl nets Caridina niloticus Rastrineobola argentea Tweddle, D. Bassa, S. Preliminary observations on the use of a frame trawl in hydroacoustic surveys |
| description |
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 |
| author2 |
Tweddle, D. |
| author_facet |
Tweddle, D. Tweddle, D. Bassa, S. |
| format |
book_section |
| topic_facet |
Fisheries Uganda Lake Victoria catch composition catch/effort echo surveys fishery surveys lake fisheries midwater trawls trawl nets Caridina niloticus Rastrineobola argentea |
| author |
Tweddle, D. Bassa, S. |
| author_sort |
Tweddle, D. |
| title |
Preliminary observations on the use of a frame trawl in hydroacoustic surveys |
| title_short |
Preliminary observations on the use of a frame trawl in hydroacoustic surveys |
| title_full |
Preliminary observations on the use of a frame trawl in hydroacoustic surveys |
| title_fullStr |
Preliminary observations on the use of a frame trawl in hydroacoustic surveys |
| title_full_unstemmed |
Preliminary observations on the use of a frame trawl in hydroacoustic surveys |
| title_sort |
preliminary observations on the use of a frame trawl in hydroacoustic surveys |
| publisher |
Fisheries Data Working Group of the Lake Victoria Fisheries Research Project |
| publishDate |
1999 |
| url |
http://hdl.handle.net/1834/21444 |
| work_keys_str_mv |
AT tweddled preliminaryobservationsontheuseofaframetrawlinhydroacousticsurveys AT bassas preliminaryobservationsontheuseofaframetrawlinhydroacousticsurveys AT tweddled reportonthirdfisheriesdataworkinggroupfidawogworkshopheldatthetrianglehoteljinja29marchto1april1999 AT bassas reportonthirdfisheriesdataworkinggroupfidawogworkshopheldatthetrianglehoteljinja29marchto1april1999 |
| _version_ |
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