study on effect of garlic crud extract on growth rate and histopathology of liver, kidney and intestinal bulb in common carp, cyprinus carpio

in order to study the effect of garlic crude extract on growth rate and histopathology of liver, kidney and intestinal bulb, 120 fishes with initial mean weight of 95±22 g were divided to four groups. they were fed with 0, 10, 20 and 40 g/kg garlic crud extract in food for 1 month. at the end of experimental period, the growth rate was estimated and samples from liver, kidney and intestinal bulb were taken. after using routine method for preparing the tissue section, they stained by h&e; staining method. there was no significant difference between control and experimental group in body weight and growth indices. the histopathology results showed that cellular degeneration was seen in the livers of the all groups of fishes. cellular degeneration and necrosis was also seen in the kidneys. there was cellular degeneration in each four groups of fishes, but the control group did not show the necrosis changes. the intestinal bulb of the fish in all four groups was normal and no injury was seen in this part of body. in conclusion our study showed that, garlic extract feeding in common carp cannot be regarded as completely safe additive. by feeding the common carp, some injuries were seen in the vital organs. also garlic feeding had not positive effect on growth rate and, however, no deleterious effects on growth of the fish.