EIFAC EXPERIMENTS ON PELAGIC FISH STOCK ASSESSMENT BY ACOUSTIC
METHODS IN LAKE TEGEL
| EIFAC Occasional Paper No. 17 | EIFAC/OP 17 |
| EIFAC EXPERIMENTS ON PELAGIC FISH STOCK ASSESSMENT BY ACOUSTIC
METHODS IN LAKE TEGEL |
by
| J. Hartmann | E. Dahm | |
| Institut für Seenforschung und Fischereiwesen Untere Seestrasse 81 7994 Langenargen Federal Republic of Germany | Bundesforschungsanstalt für Fischerei Institut für Fangtechnik Palmaille 9 2000 Hamburg 50 Federal Republic of Germany | |
| J. Dawson | P. Doering | |
| BioSonics, Inc. 4250 Union Bay Place NE Seattle, Washington 98105 United States of America | Institut für Angewandte Zoologie Haderslebener Strasse 9 1000 Berlin 41 Federal Republic of Germany | |
| S. Jürgensen | T. Lindem | |
| Fischereiamt Martin-Luther-Strasse 105 1000 Berlin 62 Federal Republic of Germany | Institute of Physics University of Oslo P.O. Box 1048 Blindern, Oslo 3 Norway | |
| H. Löffler | G. Raemhild | |
| Institut für Seenforschung und Fischereiwesen Untere Seestrasse 81 7994 Langenargen Federal Republic of Germany | BioSonics, Inc. 4520 Union Bay Place NE Seattle, Washington 98105 United States of America | |
| V. Völzke | ||
| Institut für Angewandte Zoologie Haderslebener Str. 9 1000 Berlin 41 Federal Republic of Germany |
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M-40
ISBN 92-5-102551-7
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PREPARATION OF THIS DOCUMENT
This is the report of the November 1985 EIFAC (European Inland Fisheries Advisory Commission) experiments on pelagic fish stock assessment by acoustic methods in Lake Tegel, Federal Republic of Germany.
The background of these experiments is described in the introduction of the report.
| Distribution: | For bibliographic purposes this document should be cited as follows: |
| Authors EIFAC mailing list FAO Fisheries Department FAO Regional Fishery Officers | Hartmann, J., et al., 1987 EIFAC experiments on pelagic fish stock assessment by acoustic methods in Lake Tegel. EIFAC Occas.Pap., (17): 26p. |
| ABSTRACT |
| The intention of this exercise was to compare assessments of the fish stock in a shallow lake (x = 6 m) using single- and multi-beam hydroacoustic methods as well as mark-recapture. The experiment included sampling with trawl, seine, and gill-nets. |
| The overall fish population of the pelagic (surface layer excluded) was estimated using single-beam and dual-beam echo sounder (5 % level) to 226 000 – 682 000 fish (> 3 cm) and 195 000 – 425 000 fish (> 2 cm), respectively. The mark-recapture experiment - which was not confined to the pelagic population - suggested a stock of 554 000 – 736 000 fish (> 13, 11, 16 cm) of three species, bream, white bream, and roach (Abramis brama, Blicca björkna, and Rutilus rutilus) which represent about 84 % of the commercial catch. |
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Rome 1987 © FAO
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| 1.1 | Purpose and origins of the exercise |
| 1.2 | Time and place |
| 1.3 | Personnel |
| 4.1 | Specific population estimates |
| 4.2 | Overall-population estimates |
6. ADDENDUM: FINAL RESULT OF THE EIFAC EXPERIMENTS IN LAKE CONSTANCE