caa a22 4500 397551282 CHVBK 20180308164751.0 cr unu---uuuuu 161202e199604 xx s 000 0 eng 10.1006/jmsc.1996.0034 doi (NATIONALLICENCE)oxford-10.1006/jmsc.1996.0034 Target-strength measurements of Pacific hake (Merluccius productus) in Canadian waters using quasi-ideal and conventional beam transducers [Elektronische Daten] [Akira Hamano, Toyoki Sasakura, Robert Kieser, Ken Cooke, Katsuhiko Kubota, Allen Clay] A joint Japanese/Canadian research cruise was carried out during May and June 1994 off the west coast of Canada to obtain two independent estimates of the in situ target strength (TS) of Pacific hake (Merluccius productus). Two vessels with independent quantitative echosounder systems were used. One was equipped with 120 and 50 kHz transducers, while the other used 38 kHz. The 120 kHz transducer featured a quasi-ideal beam pattern with a relatively flat response near the beam axis and low side lobes. Different single-beam TS estimation procedures were used to estimate TS from either system. Fish targets were identified by midwater trawling on the same or the next day. On one occasion both vessels were used to fish and measure TS simultaneously. The observed mean night-time TS for adult hake ranged from −36.4 to −30.4 dB kg−1. © 1996 International Council for the Exploration of the Sea Regular Articles nationallicence in situ target strength nationallicence Pacific hake nationallicence quasi-ideal beam nationallicence target tracking nationallicence Hamano Akira National Fisheries University 2-7-1, Nagatahonmachi, Shimonoseki, 759-65, Japan aut Sasakura Toyoki Furuno Electric Co. Ltd 9-52, Ashihara-cho, Nishinomiya, Japan aut Kieser Robert Department of Fisheries and Oceans Pacific Biological Station, Hammond Bay Road, Nanaimo, British Columbia, Canada, V9R 5K6 aut Cooke Ken Department of Fisheries and Oceans Pacific Biological Station, Hammond Bay Road, Nanaimo, British Columbia, Canada, V9R 5K6 aut Kubota Katsuhiko National Fisheries University 2-7-1, Nagatahonmachi, Shimonoseki, 759-65, Japan aut Clay Allen Femto Electronics Ltd PO Box 690, Lr. Sackville, Nova Scotia, Canada, B4C 3J1 aut ICES Journal of Marine Science Oxford University Press 53/2(1996-04), 273-279 1054-3139 53:2<273 1996 53 icesjms https://doi.org/10.1006/jmsc.1996.0034 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1006/jmsc.1996.0034 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hamano Akira National Fisheries University 2-7-1, Nagatahonmachi, Shimonoseki, 759-65, Japan aut NATIONALLICENCE 700 1- Sasakura Toyoki Furuno Electric Co. Ltd 9-52, Ashihara-cho, Nishinomiya, Japan aut NATIONALLICENCE 700 1- Kieser Robert Department of Fisheries and Oceans Pacific Biological Station, Hammond Bay Road, Nanaimo, British Columbia, Canada, V9R 5K6 aut NATIONALLICENCE 700 1- Cooke Ken Department of Fisheries and Oceans Pacific Biological Station, Hammond Bay Road, Nanaimo, British Columbia, Canada, V9R 5K6 aut NATIONALLICENCE 700 1- Kubota Katsuhiko National Fisheries University 2-7-1, Nagatahonmachi, Shimonoseki, 759-65, Japan aut NATIONALLICENCE 700 1- Clay Allen Femto Electronics Ltd PO Box 690, Lr. Sackville, Nova Scotia, Canada, B4C 3J1 aut NATIONALLICENCE 773 0- ICES Journal of Marine Science Oxford University Press 53/2(1996-04), 273-279 1054-3139 53:2<273 1996 53 icesjms Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford