Acoustic abundance estimation of the Icelandic stock of capelin : 1978-1982

ICES, Symposium on Fisheries Acoustics, Bergen, 1982, No. 21 During the period October 1978 - february 1982 several abundance estimates and yearclass composition of the Icelandic capelin stock were obtained by acoustic methods. Surveying has been carried out in July-Agust, September, October, Novemb...

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Bibliographic Details
Main Authors: Vilhjálmsson, Hjálmar, Reynisson, Páll, Hamre, Johannes, Røttingen, Ingolf
Format: Report
Language:English
Published: ICES 1982
Subjects:
capelin
lodde
acoustics
akustikk
stock assessment
bestandsberegning
VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921
Bergen
Iceland
Online Access:http://hdl.handle.net/11250/102130
Description
Summary:ICES, Symposium on Fisheries Acoustics, Bergen, 1982, No. 21 During the period October 1978 - february 1982 several abundance estimates and yearclass composition of the Icelandic capelin stock were obtained by acoustic methods. Surveying has been carried out in July-Agust, September, October, November as well as in January-February and on one occasion in early March. It has been found that consistent abundance estimates of the older yearclasses (excluding 0- and 1-group fish) can be obtained in autumn and winter by this method while the fish still occupy deep water areas off NW-, N-, NE- and E-Iceland. Due to drift ice and periods of bad weather it has at times proved necessary to wait or repeat surveys for these reasons. This paper describes and discusses the abundance estimates obtained during the above period. They have been used for management purposes.

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