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On the Biology of Sagitta. The Breeding and Growth of Sagitta elegans Verrill in the Plymouth Area, 1930–1931

Published online by Cambridge University Press:  11 May 2009

F. S. Russell
F. S. Russell
Affiliation:
Naturalist at the Plymouth Laboratory.
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Extract

1. A study of the adult population of Sagitta elegans Verrill has been made in the waters off Plymouth by weekly collections with the 2-metre stramin ring-trawl hauled obliquely in the daylight.

2. Measurements of large samples and a study of the state of development of the gonads has shown that there were apparently four, if not live, broods of S. elegans produced in the year.

3. These successive broods were apparently spawning in April-May, June-July, and September, 1930, and February, 1931.

4. In the offspring of the September spawning population no gonads were developed during October and November. The male organs started to ripen in December, and the ovaries in January, but the brood did not appear to be fully mature until February.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 18 , Issue 1 , May 1932 , pp. 131 - 142
Copyright
Copyright © Marine Biological Association of the United Kingdom 1932

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References

LITERATURE

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