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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on December 24, 2008
ICES Journal of Marine Science: Journal du Conseil 2009 66(2):258-263; doi:10.1093/icesjms/fsn205
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© United States Government, Department of Commerce 2008

In situ measurements of capelin (Mallotus villosus) target strength in the North Pacific Ocean

Michael A. Guttormsen and Christopher D. Wilson

National Marine Fisheries Service, Alaska Fisheries Science Center, Resource Assessment and Conservation Engineering Division, 7600 Sand Point Way NE, Seattle, WA 98115, USA

Correspondence to M. A. Guttormsen: tel: +1 206 526 4163; fax: +1 206 526 6723; e-mail: mike.guttormsen{at}noaa.gov

Guttormsen, M. A. and Wilson, C. D. 2009. In situ measurements of capelin (Mallotus villosus) target strength in the North Pacific Ocean. – ICES Journal of Marine Science, 66: 258–263.

In situ measurements of capelin (Mallotus villosus) target strength (TS) were collected during summer 2001–2003 near Kodiak Island in the Gulf of Alaska, using a calibrated EK500 echosounder with 38 and 120 kHz split-beam transducers. Targets were detected over dispersed, night-time aggregations using standard acoustic methods, then filtered using a quality-control algorithm to reject invalid targets. The 38 kHz-based, fitted model estimate was TS = 20 log10L– 70.3 (r2 = 0.30), where L is total length of fish. Compared with other studies, the TS-fitted model at 38 kHz was similar to that calculated from swimbladder morphology measurements from St Lawrence estuary capelin (TS = 20 log10L– 69.3), but resulted in greater estimates than models based on in situ measurements of capelin TS in the Barents Sea (TS = 19.1 log10L–74.0) and northern Atlantic Ocean (TS = 20 log10L – 73.1). The large intraspecific variability exhibited in the fitted TS – L models for this species suggests the use of TS measurements from the geographic region where the data were collected.

Keywords: capelin, target strength

Received 22 April 2008; accepted 30 August 2008; advance access publication 24 December 2008.


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