Abstract

Size specific energetic requirements were investigated in juveniles of the yabbie, Cherax destructor (Parastacidae). Feeding experiments were undertaken in combination with measurement of metabolic rate using locally manufactured isocaloric diets. The size range used was 0.25 to 9.5 g. Consumption varied from 2 to 12 percent body weight per day and was inversely proportional to wet weight. Assimilation efficiency of energy was high (75-95%). Consumption, assimilation and respiration were strongly correlated with wet weight and there were no significant differences between diets. Furthermore, there was a strong correlation between weight specific assimilation and respiration. Pooled data are presented which show that energetic requirements declined exponentially with increasing size. Yabbies of 1 g assimilated three and a half times and respired four times more energy than 15 g animals. Results are discussed with respect to estimation of size specific energy requirements for growth.

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