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Illex coindetii

AutorSánchez, Pilar ; González, Ángel F. ; Jereb, Patrizia; Laptikhovsky, V. V.; Mangold, K. M.; Nigmatullin, Ch. M.; Ragonese, S.
Fecha de publicación1998
EditorFood and Agriculture Organisation of the United Nations
SerieFisheries Technical Paper
ResumenIllex coindetii is widely distributed in the Mediterranean, from the south of Britain to Namibia in the eastern Atlantic, and in the Caribbean, Gulf of Mexico and Straits of Florida in the western Atlantic. It grows to a maximum size of 370 and 320 mm mantle length (ML) in males and females respectively although in most areas it rarely exceeds MLs of 270 and 200 mm respectively. Data from putative daily growth increments in the statolith indicate an average life span of one year. Squid hatched in spring/summer grow slightly faster than those hatched in autumn/winter. I. coindetii preys on fish, crustaceans and cephalopods. One group is usually predominant but this varies with prey availability, size of squid and season. In males the number of spermatophores recorded in the Needham's sac ranges from 100 to 790. In females, the number of mature eggs in the oviduct and ovaries ranges from 50 000 to 200 000 depending on body size. A total of up to 800 000 oocytes have been recorded in the oviduct and ovary of a 250 mm ML female. Mature squid are present yearround, but peaks in spawning appear to occur in the spring/summer in the Sicilian Channel and northwest Atlantic off Spain, in summer off West Africa and in autumn in the Catalan Sea. The squid remain near the seabed during daytime and migrate into the water column at night. Seasonal migrations are not well understood but there appears to be a movement from shallow to deep water between summer and winter in the Catalan Sea. The life cycle of the species is poorly understood. In the Mediterranean, there are a number of cohorts each year which overlap, making analysis difficult. The species is mostly taken as a by-catch in other fisheries.
Descripción18 pages, 8 figures, 5 tables.-- Chapter 4 of the book tittle: Squid recruitment dynamics. The genus Illex as a model. The commercial Illex species. Influences on variability.
Versión del editorftp://ftp.fao.org/docrep/fao/008/w9000e/w9000e04.pdf
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