Effect of Dietary Artemia Nauplii Enriched with Fish Oil , on Survival , Growth and Biochemical Analysis of Mullet , Mugil Cephalus , Larvae

The effects of dietary Atemia nauplii enriched with fish oil (rich in both n-3 and n-6 long chain fatty acids) on survival, growth and biochemical analysis of mullet, Mugil cephalus, larvae were studied. Two levels of fish oil (2 and 4 g /million Artemia) were applied for two different exposure periods (6 or 12 h) for the newly hatched brine shrimp Artemia and compared with normal Artemia (without additives)in feeding mullet larvae.Final body weight, survival rate, weight gain and specific growth rate significantly (p<0.05) increased with increasing the level of emulsified fish oil used to treat Artemia and with decreasing the exposure time to the emulsified fish oil. Total lipid significantly increased (p<0.05) with increasing the amount of emulsified fish oil used to treat Artemia and with decreasing the exposed time of the emulsified fish oil. Unsaturated fatty acids and EPA/DHA ratio significantly increased (p<0.05) with increasing the amount of emulsified fish oil used to treat Artemia and with decreasing the exposure time of the emulsified fish oil. Consequently growth and survival rate of mullet larvae increased significantly (p<0.05). ARA, EPA, and DHA increased significantly (p<0.05) with increasing the amount of the emulsified fish oil used to treat Artemia and with decreasing the exposure time of the emulsified fish oil giving better survival and growth of the Mugil cephalus larvae. Larvae at all treatments exhibited signs of stress through the weaning period, especially in the untreated aquaria. According to the results of the present work it was recommended that mullet larvae, Mugil cephalus, fed treated Artemia with 4g fish oil/million Artemia for 6 hours exposure time showed the best survival rate and higher growth before weaning stage.

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