A feeding experiment was conducted to investigate the effects of different lipid sources in diets on growth performance, body composition, and activities of lipid metabolism related enzymes and antioxidant enzymes in hepatopancreas of common carp (Cyprinus carpio). On the basis of a practical diet, 5 experimental diets were formulated to contain 1.5% lipid originated from fish oil (FO group), soybean oil (SO group), rapeseed oil (RO group), linseed oil (LO group) and lard (L group), respectively. Seven hundred and fifty common carp with an average initial body weight of (5.83?0.01) g were randomly divided into 5 groups with 3 replicates in each group and 50 fish in each replicate, and each group was fed one of the five experimental diets. The experiment lasted for 8 weeks. The results showed as follows: the best and the lowest specific growth rate (SGR), protein efficiency ratio (PER) and feed conversion ratio (FCR) were found in FO group and L group, respectively, and there was significant difference in those indices between FO group and L group (P<0.05), while no significant difference among SO group, RO group and LO group (P>0.05). Different lipid sources significantly affected the contents of crude protein and crude lipid of whole fish (P<0.05), but did not affect the contents of dry matter and crude ash of whole fish (P>0.05). Crude protein content of whole fish in the FO group was the highest (P<0.05), but its crude lipid content was the lowest. The hepatopancreas lipoprotein lipase (LPL) activity in FO group was the highest, next came SO group, RO group and LO group, and the lowest was in L group. The hepatopancreas malic dehydrogenase (MDH) activity showed that LO group>SO group>FO group>RO group>L group. The hepatopancreas superoxide dismutase (SOD) activity in L group was significantly higher than that in other groups (P<0.05), while no significant difference was found among LO group, SO group, FO group and RO group (P>0.05). Different lipid sources significantly affected the hepatopancreas total antioxidant capacity (T-AOC) (P<0.05), the highest was in FO group and the lowest was in L group. These results suggest that fish oil is the suitable lipid source for common carp, while lard is unsuitable as a single lipid source for common carp, because it will damage the hepatopancreas health, hinder the growth of fish.
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