Resumo

DIAZ-IGLESIAS, Eugenio et al. Bioenergetics of juvenile red claw lobster, Cherax quadricarinatus, fed two artificial diets. Hidrobiológica [online]. 2012, vol.22, n.2, pp.147-160. ISSN 0188-8897.

The metabolic response of juvenile Australian red claw lobster, Cherax quadricarinatus, fed two artificial diets (Rangen with 35% protein and Cherax1 with 32% protein of vegetable substrate), acclimated to the preferred temperature of 28 ° C, was evaluated in a dynamic respirometer, measuring oxygen consumption and ammonia excretion during fasting and feeding. Survival and growth were also determined. The energy consumed by juveniles in the food (C) was (mean ± s): 3614.1 ± 591.3 and 1967 ± 493.8 (J day^-1 g^-1) with Cherax1 and Rangen respectively. Energy eliminated in the feces (F) equivalent to 42.6 Joules by organisms that were fed Cherax1 represented a low energy loss in the percentage distribution, with a higher metabolic efficiency compared to the diet Rangen. The highest percentage of protein supplied through the food was channeled to growth, for all treatments, in which lobsters used a mixture of lipid-protein as the main energy substrate to meet their metabolic requirements. There was no difference in survival, but the juveniles fed Cherax1 had a higher specific growth rate and a 2.2 times higher weight gain than those fed with Rangen. The results show that the experimental diet Cherax1, formulated with plant products, can be considered as a high quality, efficient feed for this species, and that it is a good potential replacement for various commercial diets.

Palavras-chave : Artificial diets; Cherax quadricarinatus; energy budget; metabolic response; scope for growth.

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