Abstract

A 108-day feeding trial was conducted to study the growth and survival response of juvenile (0+) marron (1.99 ± 0.09 SE g mean initial weight) to three dietary lipid levels (0.5, 6.0 and 12.0% mass/mass, dry weight basis). Three isoenergetic and isonitrogenous semi-purified diets (D1 , D2, D3) were prepared by mixing 6% and 12% purified cod liver oil as a lipid source to diet D1 • At the end of the feeding trial, the marron fed with diet D, exhibited a significantly higher (P<0.05) specific growth rate (SGR) than marron fed with 02 and 03. Marron fed with diet D3 showed static SGR throughout the feeding trial, whereas marron fed with 02 exhibited a significant increase in SGR (P<0.05) for the first 54 days of feeding and subsequently remained static. Specific growth rate of marron fed with diet D, increased for 81 days and then declined significantly (P<0.05). There were no significant differences in survival among the three dietary treatments (P<0.05) at the end of the trial. Marron fed with diet D3, resulted in significant drop in survival after 54 days and subsequently there were no mortalities. Survival of marron fed with diets D1 and D2 decreased steadily during the feeding trial. It was evident that there was no optimal requirement tor any additional dietary lipid level in C. tenuimanus and higher levels of dietary lipids resulted in decrease in growth.

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