Vendace (Coregonus albula) stock assessment in winter using a mobile echo-survey under ice

As a consequence of a local disagreement between commercial fishermen and local fishing-right owners, we estimated the size of a vendace (Coregonus albula) stock in a southern boreal lake in Finland in March 2000. We applied a mobile under-ice echo-survey and catch sampling from winter seining. The...

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Bibliographic Details
Published in:Boreal environment research 2006, Vol.11 (6), p.415-420
Main Authors: JURVELIUS, Juha, MARJOMÄKI, Timo J, HIRVONEN, Esa, LILJA, Juha, RIIKONEN, Raimo
Format: Article
Language:English
Subjects:
Animal and plant ecology
Animal, plant and microbial ecology
Biological and medical sciences
Earth sciences
Earth, ocean, space
Exact sciences and technology
Fundamental and applied biological sciences. Psychology
General aspects
Marine and continental quaternary
Surficial geology
Synecology
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Summary:As a consequence of a local disagreement between commercial fishermen and local fishing-right owners, we estimated the size of a vendace (Coregonus albula) stock in a southern boreal lake in Finland in March 2000. We applied a mobile under-ice echo-survey and catch sampling from winter seining. The sounder with a tape recorder was placed in a shuttle and towed under ice from hole to hole with a rope. The mean fish density was 4270 fish ha–1. Vendace biomass was estimated to be ca. 36 tonnes. Commercial fishing started on a restricted scale after the completion of the assessment. The vendace yield was ca. 6 tonnes in the area during the remainder of the winter-seining season. The total winter seining catch amounted to ca. 40% of the initial vendace stock size in January 2000.
ISSN:1239-6095
1797-2469