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Several ontogenetic growth models were fitted to size-at-age data of twelve species of squid from the recent suborders Myopsina and Oegopsina. These squid represent different habitats of the world ocean – from shelf to meso- and bathypelagic waters and from tropical to polar regions. Two main criteria were used in selecting the squid: large sample size (>150 individuals) and wide range of ontogenetic coverage (>2/3 of the whole ontogenesis). The growth models used were the exponential, Gompertz, Schnute and ad hoc two-stage models. They were fitted to size-at-age data using maximum likelihood for estimation and Akaike weights for identification. In all species, the 4-parameter Schnute or the 3-parameter Gompertz models provided the best fit. Size at the inflection point of the growth curve for most squid was smaller than size at 50% maturity, suggesting that maturation is not a major cause of the change in growth rate for these species. Mathematical and statistical procedures to calculate standard measures of growth, such as the instantaneous relative rate of growth, G , which are valid for all continuous growth models, are also presented.
Marine & Freshwater Research – CSIRO Publishing
Published: Jun 27, 2005
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