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Science 31 October 1969:
Vol. 166. no. 3905, pp. 611 - 613
DOI: 10.1126/science.166.3905.611
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Articles

Shallow Scattering Layer in the Subarctic Pacific Ocean: Detection by High-Frequency Echo Sounder

W. E. Barraclough 1, R. J. LeBrasseur 1, and O. D. Kennedy 1

1 Pacific Oceanographic Group, Biological Station, Fisheries Research Board of Canada, Nanaimo, British Columbia

Shallow scattering layers consisting mainly of Calanus cristatus were detected on a trans-Pacific crossing to depths of 60 meters with a high-frequency echo sounder. Biomass estimates of these layers indicate concentrations of zoo-plankton that are greater and more extensive than previously reported in the open ocean.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)