Unknown
Freshwater Biological Association
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Ambleside, UK
In:
http://aquaticcommons.org/id/eprint/5310
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3949
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2011-09-29 15:07:00
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5310
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Freshwater Biological Association
Publication Date:
2021-07-09
Description:
A comparison of some different European methods of estimating the numbers of fish in a lake using different fishing gear is described. The different gears used were 1. surface trawl used by night 2. bottom trawl used by day 3. trammel nets, set in the evening and lifted in the morning 4. surface seine net used by night 5. bottom seine net used by day 6. Fyke nets, emptied each morning and evening 7. gill nets, set in the evening and lifted in the morning. The most variable catches were from those gears used by day on the bottom and the least variable were those used by night at the surface. The work continued by examining the use of acoustic systems for pelagic fish stock assessment. This gear gave reasonable population estimates for pelagic fish 10m and more below the surface. The advantage of the accoustic method is that it is quick and requires little labour. Its disadvantage is that it is not possible to identify the species and so it must be supplemented by another, conventional method.
Keywords:
Fisheries
;
Management
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Acoustic equipment
;
Entangling nets
;
Experimental fishing
;
Fishery surveys
;
Fishery resources
;
Fishing gear
;
Gillnets
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Population number
;
Seine nets
;
Trap nets
;
Trawl nets
;
Europe
;
Annual report
Repository Name:
AquaDocs
Type:
book_section
,
FALSE
Format:
application/pdf
Format:
application/pdf
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