1996
DOI: 10.14430/arctic1196
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Quantitative Studies of Arctic Cod (<i>Boreogadus saida</i>) Schools: Important Energy Stores in the Arctic Food Web

Abstract: Aggregations of Arctic cod (Boreogadus saida) in Allen Bay, on the southern coast of Cornwallis Island, Lancaster Sound were studied with fishery acoustics techniques in 1989 and 1990. Nonschooling fish were also examined in several Cornwallis and Devon Island bays. Although acoustic signal shading within the schools minimized abundance estimates (error may exceed 50%), measurements in 1989 indicated that two aggregations of adult Arctic cod together comprised at least 900 million individuals. Combined surface… Show more

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Cited by 59 publications
(47 citation statements)
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“…Instruments, Inc., personal communication). The target strength of adult polar cod varies between ¡40 and ¡50 dB (Crawford and Jorgenson 1996) making it technically feasible to identify echoes from individual Wsh in the ADCP data. However, in the present study, backscatter strength threshold values were used to identify and classify Wsh shoals.…”
Section: Methodsmentioning
confidence: 99%
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“…Instruments, Inc., personal communication). The target strength of adult polar cod varies between ¡40 and ¡50 dB (Crawford and Jorgenson 1996) making it technically feasible to identify echoes from individual Wsh in the ADCP data. However, in the present study, backscatter strength threshold values were used to identify and classify Wsh shoals.…”
Section: Methodsmentioning
confidence: 99%
“…Crawford and Jorgenson 1996), a heuristic data analysis scheme was devised that was based on Wve backscatter signal-strength categories, or thresholds, as listed in Table 1. A companion study (Walkusz et al 2008) also conducted during JWACS 2002 involved collecting plankton and larval Wshes with a General Oceanics 0.61 m diameter bongo net system at 33 stations along the survey line. The net sampling scheme was aided by information gathered (1-40 m) with a single beam (¡3 dB beam angle 9°) 192 kHz Lowrance X-15B echo sounder operated while the ship was on station (i.e., drifting).…”
Section: Methodsmentioning
confidence: 99%
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