Effect of dietary Chlorella vulgarissupplementation on growth performance, feed and body chemical composition of grey mullet , Mugil cephalus Linnaeus 1758

This experiment was conducted to evaluate the effect of Chlorella vulgarispowder on the growth performance (final weight (FW), final length (LW), weight gain (WG), specific growth rate, daily growth ratio (DGR), condition factor (CF), hepatosomatic index (HSI)), feed indices (feed conversion rate (FCR), voluntary feed intake (VFI), protein efficiency ratio (PER) and lipid efficiency ratio (LER)) and body chemical (protein, fat, moisture and ash) Mugil cephalusfor 60 days. The experiment was conducted in a completely randomized design with 120 of grey mullet (with average weight of 14.95±2.01g) in 4 treatments and 3 replicates (n=10 in each replicate) and included: control group without using algae extract, an another groups (treatment 2,3and 4) the amounts of this extract were 5,10 and 15 g/kg food. The results showed that at the end of experiment, the highest LW (11.08±0.10 cm), WG (216.85 ± 12.39 g), DGR (6.53±0.18%), SGR (0.90± 0.07), the lowest VFI (0.99±0.03 %), the highest PER (4.61±0.27), the highest PPV (39.48±2.54), the highest crude protein (0.99±0.0%), the highest crude lipid (10.37±0.24%) and the highest LER (1.23±0.09%) were observed in the diet containing 5 g /kg algae extract in all of these parameters, treatment 2 showed a significant difference compared with control treatment (P<0.05). The highest protein and moisture were shown in in the diet containing 10 g /kg algae extract. Finally, the present results suggest that diet containing 5 g/kg Chlorella vulgariscould improve growth, feed performances and carcass quality in M. cephalus.