Diel vertical migration of major fish-species in Lake Victoria, East Africa
Understanding of migration patterns is essential in the interpretation of hydro-acoustic stock assessment data of partly demersal partly pelagic fish stocks. In this paper we provide this kind of information for some species that were common in the Mwanza Gulf of Lake Victoria in the 1980s, before a...
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| Veröffentlicht in: | Hydrobiologia 2004-02, Vol.513 (1), p.141-152 |
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| creator | GOUDSWAARD, Kees WANINK, Jan H WITTE, Frans KATUNZI, Egid F. B BERGER, Michiel R POSTMA, David J |
| description | Understanding of migration patterns is essential in the interpretation of hydro-acoustic stock assessment data of partly demersal partly pelagic fish stocks. In this paper we provide this kind of information for some species that were common in the Mwanza Gulf of Lake Victoria in the 1980s, before and after the upsurge of introduced Nile perch (Lates niloticus). Detritivorous haplochromines and Nile tilapia (Oreochromis niloticus), both stay near the bottom during day and night. Feeding seems to occur predominantly during the day. The zooplanktivorous haplochromines and dagaa (Rastrineobola argentea) dwell near the bottom by day and migrate towards the surface during the night. They seem to follow their prey, zooplankton and lake-fly larvae. Piscivorous nembe (Schilbe intermedius) show similar migration patterns to zooplanktivorous fishes, but their behaviour cannot be unambiguously explained by pursuit of prey. Nile perch to some extend migrate into the column at night, though the majority remains near the bottom. Feeding takes place during day and night.[PUBLICATION ABSTRACT] |
| doi_str_mv | 10.1023/B:hydr.0000018179.80116.93 |
| format | Article |
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B ; BERGER, Michiel R ; POSTMA, David J</creator><creatorcontrib>GOUDSWAARD, Kees ; WANINK, Jan H ; WITTE, Frans ; KATUNZI, Egid F. B ; BERGER, Michiel R ; POSTMA, David J</creatorcontrib><description>Understanding of migration patterns is essential in the interpretation of hydro-acoustic stock assessment data of partly demersal partly pelagic fish stocks. In this paper we provide this kind of information for some species that were common in the Mwanza Gulf of Lake Victoria in the 1980s, before and after the upsurge of introduced Nile perch (Lates niloticus). Detritivorous haplochromines and Nile tilapia (Oreochromis niloticus), both stay near the bottom during day and night. Feeding seems to occur predominantly during the day. The zooplanktivorous haplochromines and dagaa (Rastrineobola argentea) dwell near the bottom by day and migrate towards the surface during the night. They seem to follow their prey, zooplankton and lake-fly larvae. Piscivorous nembe (Schilbe intermedius) show similar migration patterns to zooplanktivorous fishes, but their behaviour cannot be unambiguously explained by pursuit of prey. Nile perch to some extend migrate into the column at night, though the majority remains near the bottom. Feeding takes place during day and night.[PUBLICATION ABSTRACT]</description><identifier>ISSN: 0018-8158</identifier><identifier>EISSN: 1573-5117</identifier><identifier>DOI: 10.1023/B:hydr.0000018179.80116.93</identifier><identifier>CODEN: HYDRB8</identifier><language>eng</language><publisher>Dordrecht: Springer</publisher><subject>Animal and plant ecology ; Animal, plant and microbial ecology ; Aquaculture ; Biological and medical sciences ; Fish ; Fresh water ecosystems ; Fundamental and applied biological sciences. 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Piscivorous nembe (Schilbe intermedius) show similar migration patterns to zooplanktivorous fishes, but their behaviour cannot be unambiguously explained by pursuit of prey. Nile perch to some extend migrate into the column at night, though the majority remains near the bottom. Feeding takes place during day and night.[PUBLICATION ABSTRACT]</description><subject>Animal and plant ecology</subject><subject>Animal, plant and microbial ecology</subject><subject>Aquaculture</subject><subject>Biological and medical sciences</subject><subject>Fish</subject><subject>Fresh water ecosystems</subject><subject>Fundamental and applied biological sciences. 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| subjects | Animal and plant ecology Animal, plant and microbial ecology Aquaculture Biological and medical sciences Fish Fresh water ecosystems Fundamental and applied biological sciences. Psychology Lakes Larvae Prey Synecology Zooplankton |
| title | Diel vertical migration of major fish-species in Lake Victoria, East Africa |
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