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The size of a vendace, Coregonus albula L., stock in a deep lake basin monitored by hydroacoustic methods
Author(s) -
Jurvelius J.,
Lindem T.,
Heikkinen T.
Publication year - 1988
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.1988.tb05408.x
Subject(s) - hypolimnion , fishery , thermocline , biology , coregonus , biomass (ecology) , fishing , structural basin , drainage basin , stock assessment , oceanography , ecology , fish <actinopterygii> , eutrophication , geography , nutrient , geology , paleontology , cartography
An acoustic estimate of the number and biomass of a vendace stock (age >2 + years) in a deep basin of Lake Karjalan Pyhäjärvi was made in August 1985. The acoustic data were collected at night during the summer stagnation. The vendace were on the lake bottom during the day and rose by midnight to the hypolimnion; they did not rise to the thermocline or water layers above it. In the research area the mean number of vendace was 1900 fish ha −1 and the mean biomass was 76 kg ha −1 . Total vendace biomass was 151 in the whole 200‐ha research area.