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

Kód výsledku v 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>

Nalezeny alternativní kódy

RIV/60076658:12310/12:43883680 RIV/62157124:16170/12:43871007

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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

Název v anglickém jazyce

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

Popis výsledku anglicky

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

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

EH - Ekologie – společenstva

OECD FORD obor

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Projekt

<a href="/cs/project/KJB600960813" target="_blank" >KJB600960813: Paraziti ryb jezera Turkana, Keňa: model pro studium evolučních procesů a vlivu abiotických faktorů</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2012

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Great Lakes Research

ISSN

0380-1330

e-ISSN

—

Svazek periodika

38

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

98-106

Kód UT WoS článku

000301513900011

EID výsledku v databázi Scopus

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