The last snapshot of natural pelagic fish assemblage in Lake Turkana, Kenya: A hydroacoustic study

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60077344%3A_____%2F12%3A00377848" target="_blank" >RIV/60077344:_____/12:00377848 - isvavai.cz</a>
Alternative codes found
RIV/60076658:12310/12:43883680 RIV/62157124:16170/12:43871007
Result on the web
<a href="http://dx.doi.org/10.1016/j.jglr.2011.11.014" target="_blank" >http://dx.doi.org/10.1016/j.jglr.2011.11.014</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.jglr.2011.11.014" target="_blank" >10.1016/j.jglr.2011.11.014</a>

Result language
angličtina
Original language name
The last snapshot of natural pelagic fish assemblage in Lake Turkana, Kenya: A hydroacoustic study
Original language description
A hydroacoustic survey and supplementary gillnet investigation were carried out in the open water of the central part of Lake Turkana in September 2009. Overall acoustic ?sh density and biomass were assessed as1381 ind./ha and30 kg/ha, respectively. The?sh density estimate was lower than the results from two previous investigations in the 1970s and 1980s (long-term average 3739 ind./ha), but the biomass remained relatively unchanged (long-term average 25.4 kg/ha). A decreasing gradient in pelagic ?sh density from the western to eastern shore of the lake was observed. Fish were distributed unevenly within the water column. During the day, a majority of ?sh aggregated in the mid-water layers (10?12 m below the water surface), creating on echograms the so-called Midwater Scattering Layer. This feature dissipated completely during dusk and the majority of ?sh occurred in the surface layers at night. These diel vertical ?sh migrations in?uenced day and night hydroacoustic estimates of the
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
EH - Ecology - communities
OECD FORD branch
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Project
<a href="/en/project/KJB600960813" target="_blank" >KJB600960813: Fish parasites of the Turkana Lake, Kenya: a model for study of evolutionary processes and impact of abiotic factors</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2012
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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