Brief review on the ecology in the north African population of arrow squid Todarodes sagittatus (Cephalopoda: Ommastrephidae)
An isolated population of Todarodes sagittatus inhabits the shelf and slope waters of North African coast from 11°45′ to 26°N within the depth range 65–1100 m. This population has a 1-yr life cycle and spawns year-round, with a clear winter peak. Hatched larvae rise to the subsurface layers above the continental slope and grow there up to 12–15 cm ML. Then immature squid (10–25 cm ML) forage from May to August over the continental shelf from 18° to 25° N (depth range 100–300 m). In this period they formed fishery concentrations. In August–October, when maturation begins, squid concentrations disperse, mature squids (males of 20–28 cm ML, females of 25–35 cm ML) descend to 400–800 (1100) m depth. Squid abundance and density of the summer foraging aggregations vary by years as well as by depth ranges. Annual Soviet catches vary from 17 to 3725 mt (1980–1991) the highest value being of 18,000 mt (1974). Squid biomass was estimated to be 10–30 thousand mt in years of low abundance to 80–120 thousand mt in years of high abundance.
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Document Type: Research Article
Publication date: July 1, 2002
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