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Size and sexual maturity of a large number of Loligo gahi Orbigny 1835 from commercial trawler catches around the Falkland Islands were recorded. Data are explained by proposing that the squid have a 1 yr lifespan and that the population consists of 2 stocks, one spring-spawning and one autumn-spawning. Degree of mixlng between the stocks was not assessed. Lnear and von Bertalanffy equations are used to model the growth of the spring-spawning stock. Both models fit the data nearly equally well, the linear fit yielding slope = 0.0237 for males (0.0199 for females) cm dorsal mantle length d-' growth rate and the von Bertalanffy fit yielding K = 0.00304 (0.00308) d-l, L, = 19.6 (17.8) cm, to = -101.4 (-113.6) d from 1 Jan. This growth rate is surprisingly fast given the cold water temperatures around the Falklands, and suggests that food was plentiful for this species.

Life history of Patagonian squid Loligo gahi and growth parameter estimates using least-squares fits to linear and von Bertalanffy models