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

  • P.G. Rodhouse (a1) and E.M.C. Hatfield (a1)


Samples of male Illex argentinus were taken from the catch of a Japanese squid jigging vessel on the Patagonian Shelf during March 1986 and an analysis was carried out on the morphometrics of the somatic and reproductive organ systems in relation to maturation. The data show that growth and maturation occurred simultaneously during most of the time that Illex argentinus males were on the feeding grounds over the southern Patagonian Shelf. In a squid of a ‘standard’ mantle length the whole body mass increased relative to mantle length during maturation and this could be attributed to the increase in mass of the reproductive and accessory reproductive organs. During maturation the mantle and digestive gland mass showed no significant change relative to mantle length. The mass of the head increased and the mass of the viscera decreased relative to mantle length. In male Illex argentinus, as in the female, the energy and nutrient resources for maturation are derived from the squid's food and during the course of maturation there is an increasing shift of emphasis from somatic growth to production of gonad and accessory reproductive organs. The proportional investment of body mass in reproductive and accessory reproductive organs predicted for a fully mature male Illex argentinus was less than half that of the female.



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Coelho, M.L., Mallet, M.D. & O'dor, R.K., 1985. Evaluation of male reproductive features as maturity indices for short-finned squid (Illex illecebrosus). Scientific Council Studies. Northwest Atlantic Fisheries Organization, 9, 107115.
Gabbott, P.A., 1976. Energy metabolism. In Marine mussels (ed B.L., Bayne), pp. 293355. Cambridge: Cambridge University Press.
Hatanaka, H., 1988. Feeding migration of short-finned squid Illex argentinus in the waters off Argentina. Nippon Suisan Gakkaishi, 54, 13431349.
Hatanaka, H., Kawahara, S., Uozumi, Y. & Kasahara, S., 1985. Comparison of life cycles of five ommastrephid squids fished by Japan: Todarodes pacificus, Illex illecebrosus, Illex argentinus, Nototodarus sloani sloani and Nototodarus sloani gouldi. Scientific Council Studies. Northwest Atlantic Fishieries Organization, 9, 5968.
Hatfield, E.M.C., Rodhouse, P.G. & Barber, D.L., 1992. Production of soma and gonad in maturing female Illex argentinus (Mollusca: Cephalopoda). Journal of the Marine Biological Association of the United Kingdom, 72, 281291.
Hayashi, Y., 1970. Studies on the maturity condition of the common squid. I. A method of expressing maturity condition by numerical values. Bulletin of the Japanese Society for Scientific Fisheries, 36, 995999. [In Japanese.]
Juanico, M., 1983. Squid maturity scales for population analysis. In Advances in assessment of world cephalopod resources (ed J.F., Caddy), pp. 341378. FAO Fisheries Technical Paper no. 231.
Lipinski, M., 1979. Universal maturity scale for the commercially important squids. The results of maturity classification of the Illex illecebrosus (Lesueur, 1821) population for the years 1973–77. International Commission for Northwest Atlantic Fisheries (ICNAF) Research Document 79/11/38, serial no. 5364, 40 pp.
O'dor, R.K. & Wells, M.J., 1978. Reproduction versus somatic growth: hormonal control in Octopus vulgaris. journal of Experimental Biology, 77, 1531.
Payne, al., 1987. Genstat 5 reference manual. Oxford: Oxford University Press.
Rodhouse, P.G., Barton, J., Hatfield, E.M.C. & Symon, C., in press. Illex argentinus (Cephalopoda: Ommastrephidae): life cycle, population structure and fishery. Rapports et Proces-verbeaux des Réunions. Conseil International pour l'Exploration de la Mer.
Rodhouse, P.G. & Hatfield, E.M.C., 1990. Dynamics of growth and maturation in the cephalopod Illex argentinus de Castellanos, 1960 (Teuthoidea: Ommastrephidae). Philosophical Transactions of the Royal Society of London (B), 329, 229241.
Roper, C.F.E., Sweeney, M.J. & Nauen, C.E., 1984. Cephalopods of the world. An annotated and illustrated catalogue of species of interest to fisheries. FAO Fisheries Synopsis no. 125, vol. 3, 227 pp.
Rowe, V.L. & Mangold, K., 1975. The effect of starvation on sexual maturation in Illex illecebrosus (Lesueur) (Cephalopoda: Teuthoidea). Journal of Experimental Marine Biology and Ecology, 17, 157164.
Ryan, B.F., Joiner, B.L. & Ryan, T.A., 1985. Minitab handbook. Boston: Duxbury Press.
Schuldt, M., 1979. Contribucion al conocomiento del ciclo reproductor de Illex argent inus. Monografias Comunicaciónes Cientificas Argentinas, 10, 110 pp.


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