© 2003 by ICES/CIEM International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer
Acoustic Doppler current profiler observations of herring movement
a Department of Physics and Physical Oceanography, Memorial University of Newfoundland St. John's, Newfoundland, Canada A1B 3X7
b Institute for Marine Research Bergen, Norway
*Correspondence to L. Zedel. e-mail: zedel{at}physics.mun.ca; tor{at}imr.no; ranjan{at}physics.mun.ca.
Observations were made of over-wintering (December 1997) and migrating (January 1998) Norwegian, spring-spawning herring (Clupea harengus) using a moored 307 kHz acoustic Doppler current profiler (ADCP). The location of herring in ADCP data is identified by regions of volume-backscatter strength greater than –60 dB re 1 m–1. The presence of herring was verified using net trawls and 38 kHz, EK500 data. While the ADCP cannot make speed measurements of individual fish, the system does provide a measure of the swimming speed and direction of large herring schools. Herring were observed to move both horizontally and vertically: horizontal speeds were from 0 to 50 cm s–1. Higher speeds were observed during daylight hours for both deployments with somewhat increased activity at both dawn and dusk. At night-time, over-wintering herring demonstrated no well-defined velocity.
Keywords: herring, ADCP, migration, swimming speed, swimming direction
Received 18 October 2001; accepted 4 June 2002.
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