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Production of soma and gonad in maturing female Illex argentinus (Mollusca: Cephalopoda)

Published online by Cambridge University Press:  11 May 2009

E.M.C. Hatfield ,
P.G. Rodhouse  and
D.L. Barber
E.M.C. Hatfield
Affiliation:
Marine Life Sciences Division, British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 OET
P.G. Rodhouse
Affiliation:
Marine Life Sciences Division, British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 OET
D.L. Barber
Affiliation:
Department of Biology, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4K1, Canada
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Abstract

Samples of female lllex argentinus were taken from the catch of a Japanese squid jigging vessel on the Patagonian Shelf during March 1986. Morphometrics of the somatic and reproductive organ systems and the histological structure of the mantle in relation to maturation were examined. The data suggest that growth and maturation occur simultaneously during most of the time that lllex argentinus females are on the feeding grounds. In a squid of a ‘standard’ mantle length the whole body mass increases relative to mantle length during maturation and growth of the reproductive organs. This is accompanied by a small but significant decrease in the relative mass of the mantle, head and viscera whilst the mass of the digestive gland remains constant. Although mantle mass of a ‘standard’ female squid decreases relative to mantle length with maturity this is not associated with degeneration of the mantle muscles. Energy and nutrient resources for maturation are apparently derived from the squid's food, not from reserves, and during the course of maturation there is an increasing shift of emphasis from somatic growth to production of gonad and accessory reproductive organs.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 72 , Issue 2 , May 1992 , pp. 281 - 291
Copyright
Copyright © Marine Biological Association of the United Kingdom 1992

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