EIFAC EXPERIMENTS ON PELAGIC FISH STOCK ASSESSMENT BY ACOUSTIC METHODS IN LAKE CONSTANCE
| EIFAC Occasional Paper No. 15 | EIFAC/OP 15 |
| EIFAC EXPERIMENTS ON PELAGIC FISH STOCK ASSESSMENT BY ACOUSTIC METHODS IN LAKE CONSTANCE |
by
| E. Dahm Bundesforschungsanstalt für Fischerei Institut für Fangtechnik Palmaille 9 - 2000 Hamburg 50 Federal Republic of Germany | J. Hartmann Institut für Seenforschung und Fischereiwesen Untere Seestr. 81 - 7994 Langenargen Federal Republic of Germany |
| T. Lindem Institute of Physics University of Oslo P.O. Box 1048 Blindern, Oslo 3 Norway | H. Löffler Institut für Seenforschung und Fischereiwesen Untere Seestr. 81 - 7994 Langenargen Federal Republic of Germany |
Reprinted, 1985
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PREPARATION OF THIS DOCUMENT
This is the report of the 1983 EIFAC experiments on pelagic fish stock assessment by acoustic methods in Lake Constance, Federal Republic of Germany.
The background of these experiments is described in the introduction of the report.
| Distributions: | For bibliographic purposes this document should be cited as follows: |
| Authors EIFAC mailing list FAO Fisheries Department FAO Regional Fisheries Officers | Dahm, E., et al., 1985 EIFAC experiments on pelagic fish stock assessment by acoustic methods in Lake Constance. EIFAC Occas.Pap/Doc. Occas.CECPI, (15):14 p. |
| ABSTRACT |
| The main goal of this experiment was to compare fish stock estimations from acoustic methods and conventional virtual population analysis. But because the results of VPA will not be available before 1986, standing stock size was calculated provisionally from predicted year-class strengths. The estimations from these predictions and acoustic survey agree quite well. |
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1.1 Purpose and Origins of the Exercise
1.2 Time and Place
1.3 Personnel
3.1 Gear and its Operation
3.2 Treatment of the Trawl Catches
4.1 Overall Catch Composition
4.2 Catch Composition of the Different Gear
4.3 Regional Catches
5. FISH DENSITIES ESTIMATED FROM THE HYDROACOUSTIC SURVEY
6. COMPARISON OF FISH LENGTH DISTRIBUTIONS
6.1 Trawl catches
6.2 Acoustic survey
6.3 Trawl and acoustic Comparison
6.4 Conclusion