Abstract
Age and growth patterns of luderick, Girella tricuspidata (Quoy and Gaimard), taken in the Moreton Bay net fishery are described. Scales have prominent annuli which are formed during the period May‐July. The mean body length is similar for males and females, except for age class III where female fish are significantly larger. This probably results from the early movement of faster growing females onto the fishing ground. The scale method and length‐frequency analysis both indicate that the variation in body lengths in each age class is large. The length‐weight relationship was obtained and relative condition factor was found to be highest in July which corresponded with the peak in gonosomatic index.
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