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A record of plankton on the echo-sounder

Published online by Cambridge University Press:  11 May 2009

D. H. Cushing  and
I. D. Richardson
D. H. Cushing
Affiliation:
Fisheries Laboratory, Lowestoft
I. D. Richardson
Affiliation:
Fisheries Laboratory, Lowestoft
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Extract

A number of records from echo-sounders have been loosely attributed to the presence of plankton. Only two records have been adequately identified as having been produced by plankton; first, the traces offish larvae, or shallow scattering layers (Burd & Lee, 1951); and secondly, the echo layer, at the depth of the temperature discontinuity or thermocline, which is sometimes associated with plankton animals or plants (Cushing, Lee & Richardson, in press). A third type of record, that from the ‘deep scattering layer', has been associated with the presence of euphausiids (Hersey & Moore, 1948; Moore, 1950; Boden, 1950): an equally plausible association with the presence of fish has been made by Marshall (1951), Tucker (1951) and Hersey & Backus (1954). A fourth type of echo record, a ‘noisy’ record, will be described and will show that it is probably attributable to plankton organisms, consisting, in one instance, of euphausiids.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 35 , Issue 1 , February 1956 , pp. 231 - 240
Copyright
Copyright © Marine Biological Association of the United Kingdom 1956

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References

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