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

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Science  31 Oct 1969:
Vol. 166, Issue 3905, pp. 611-613
DOI: 10.1126/science.166.3905.611


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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