Growth and condition of marron Cherax tenuimanus fed pelleted diets of different stability
1998
Jussila, J. | Evans, L.H.
Six groups of 0 + marron Cherax tenuimanus were reared on commercial marron diets based on two different fish meals in a study lasting 4 months. Both diets were prepared in a stable and an unstable pelleted form. Marron fed with koi carp or salmon diet and unfed were used as reference groups. Marron were reared communally in tanks (5 m(-2)) and individually in an intensive crayfish culture system (ICCS, 25 m(-2)). Marron were fed at the rate of 6.5% of their body weight per week. Groups fed with stable diets showed larger weight increment at moult, shorter intermoult period, and higher specific growth rate than groups fed with similar unstable diets. Stable marron diets resulted in faster growth than fish diets. There were no differences in hepatopancreatic indices of marron fed with stable diets or similar unstable diets in the ICCS. The condition of hepatopancreata of marron reared in communal tanks were better than those of marron reared in the ICCS on a similar diet. Results indicate that marron production can be improved using stable pelleted diets in both intensive and semi-intensive culture.
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