EIFAC EXPERIMENTS ON PELAGIC FISH STOCK ASSESSMENT BY ACOUSTIC METHODS IN LAKE KONNEVESI, FINLAND

EIFAC Occasional Paper No. 14

EIFAC/OP14

	EIFAC EXPERIMENTS ON PELAGIC FISH STOCK ASSESSMENT BY ACOUSTIC METHODS IN LAKE KONNEVESI, FINLAND
	CONTENTS

T.B. Bagenal Freshwater Biological Association The Ferry House Ambleside Cumbria LA 22 OLP United Kingdom	E. Dahm Bundesforschungsanstalt für Fischerei Institut für Fangtechnik Palmaille 9 - 2000 Hamburg 50 Federal Republic of Germany


T. Lindem Institute of Physics University of Oslo P.O. Box 1048 Blindern, Oslo 3 Norway	P. Tuunainen Finnish Game and Fisheries Research Institute P.O. Box 193 00131 Helsinki 13 Finland

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PREPARATION OF THIS DOCUMENT

This is the report of the 1980 EIFAC experiments on pelagic fish stock assessment by acoustic methods in Lake Konnevesi, Finland.

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 Fisheries Officers	Bagenal, T.B. et al., 1982 EIFAC experiments on pelagic fish stock assessment by acoustic methods in Lake Konnevesi, Finland. EIFAC Occas.Pap., (14): 16 p.

ABSTRACT

This paper reviews the origins of the exercise, the equipment (echo-sounder and trawl) used, the treatment of the catches, the estimation of fish density resulting from trawling and acoustic surveys. It provides comparisons between fish length distributions and draws conclusions on the results of the experiments.

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Rome 1982 © FAO

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1. INTRODUCTION

1.1 Purpose

1.2 Origins of the Exercise

3.1 The Gear and its Operation

3.2 The Treatment of the Trawl Catches

4. THE CATCHES

5. THE CAPTURE-MARK-RECAPTURE EXPERIMENT