Monthly variability of hydroacoustic fish stock estimates in a deep lake and its correlation to gillnet catches
Identifieur interne : 000B25 ( Main/Exploration ); précédent : 000B24; suivant : 000B26Monthly variability of hydroacoustic fish stock estimates in a deep lake and its correlation to gillnet catches
Auteurs : Thomas Mehner (biologiste) [Allemagne] ; M. Schulz [Allemagne]Source :
- Journal of Fish Biology [ 0022-1112 ] ; 2002-11.
English descriptors
Abstract
Monthly (April to November) hydroacoustic surveys and parallel gillnet catches were used to determine vendace Coregonus albula abundance, biomass and population dynamics in a deep oligotrophic lake. By hydroacoustic surveys, recruitment of 0+ year vendace could clearly be detected. In contrast, gillnet catches resulted in low numbers of 0+ year fish, and similarly under‐represented proportions of the oldest vendace. Consequently, the correlation between hydroacoustics and gillnets with respect to fish numbers and geometric mean fish total length was high only for the age groups 1 + to 4+ years. Annual variability in hydroacoustic estimates offish abundance and biomass was high (CV=26–29%) which reflects the seasonal population dynamics of vendace.
Url:
DOI: 10.1111/j.1095-8649.2002.tb02459.x
Affiliations:
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Schulz</name><affiliation wicri:level="3"><country xml:lang="fr">Allemagne</country><wicri:regionArea>Leibniz‐Institute of Freshwater Ecology and Inland Fisheries, Department of Biology and Ecology of Fishes, P.O.B. 850 119, D‐12561 Berlin</wicri:regionArea><placeName><region type="land" nuts="3">Berlin</region><settlement type="city">Berlin</settlement></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Fish Biology</title><idno type="ISSN">0022-1112</idno><idno type="eISSN">1095-8649</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="2002-11">2002-11</date><biblScope unit="volume">61</biblScope><biblScope unit="issue">5</biblScope><biblScope unit="page" from="1109">1109</biblScope><biblScope unit="page" to="1121">1121</biblScope></imprint><idno type="ISSN">0022-1112</idno></series><idno type="istex">1E1EB8718866F27AE2F815D884C62564A260C842</idno><idno type="DOI">10.1111/j.1095-8649.2002.tb02459.x</idno><idno type="ArticleID">JFB1109</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0022-1112</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>monitoring</term><term>oligotrophic lake</term><term>recruitment</term><term>split‐beam echo‐sounding</term><term>vendace</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Monthly (April to November) hydroacoustic surveys and parallel gillnet catches were used to determine vendace Coregonus albula abundance, biomass and population dynamics in a deep oligotrophic lake. By hydroacoustic surveys, recruitment of 0+ year vendace could clearly be detected. In contrast, gillnet catches resulted in low numbers of 0+ year fish, and similarly under‐represented proportions of the oldest vendace. Consequently, the correlation between hydroacoustics and gillnets with respect to fish numbers and geometric mean fish total length was high only for the age groups 1 + to 4+ years. Annual variability in hydroacoustic estimates offish abundance and biomass was high (CV=26–29%) which reflects the seasonal population dynamics of vendace.</div></front></TEI><affiliations><list><country><li>Allemagne</li></country><region><li>Berlin</li></region><settlement><li>Berlin</li></settlement><orgName><li>Institut Leibniz d’écologie aquatique et de la pêche en eau douce</li></orgName></list><tree><country name="Allemagne"><region name="Berlin"><name sortKey="Mehner, T" sort="Mehner, T" uniqKey="Mehner T" first="T." last="Mehner">Thomas Mehner (biologiste)</name></region><name sortKey="Schulz, M" sort="Schulz, M" uniqKey="Schulz M" first="M." last="Schulz">M. Schulz</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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