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On the biology of Calanus finmarchicus. VII. Factors affecting egg production

Published online by Cambridge University Press:  11 May 2009

S. M. Marshall  and
A. P. Orr
S. M. Marshall
Affiliation:
The Marine Station, Millport
A. P. Orr
Affiliation:
The Marine Station, Millport
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Extract

Comparatively little is known about the factors affecting egg-laying in Calanus. Deductions from work in the field have been made by Nicholls (1933a, b) and Marshall, Nicholls & Orr (1934), and experimental work in the laboratory has been done by Raymont & Gross (1942).

Emgg-LayingInCalanus

The anatomy of the reproductive system has been described in detail by Lowe (1935). In the female there is a pair of diverticula extending from the proximal end of the oviduct into the head region, and into this the developing eggs pass. Each diverticulum has a dorsal and a ventral channel, and the eggs pass from the dorsal into the ventral channel and then into the oviduct proper. The oviduct rises from the forward end of the ovary and crosses the body laterally and ventrally so that a short part of it can be clearly seen.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 30 , Issue 3 , February 1952 , pp. 527 - 549
Copyright
Copyright © Marine Biological Association of the United Kingdom 1952

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