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Science 29 May 1964:
Vol. 144. no. 3622, pp. 1132 - 1133
DOI: 10.1126/science.144.3622.1132
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Articles

Night-Caught and Day-Caught Larvae of the California Sardine

John D. Isaacs 1

1 Scripps Institution of Oceanography, La Jolla, California

Some 70,000 larvae of the California sardine, collected from about 10,000 plankton hauls over the years 1950 to 1957, have been sorted by lengths and enumerated. The numbers of the day-caught larvae are very closely a numerical measure of the apparent mortality as indicated by the night-caught larvae. Over a considerable interval of size, the night-caught larvae appear to be representative of the entire larval population, but the day-caught larvae may represent a fraction that is a measure of the natural mortality of the population.

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