Abstract
The present study was conducted to evaluate the use of Epilobium hirsutum extract in diet of common carp, Cyprinus carpio (20 � 2 g). Diierent levels of plant extract (0%, 0.5%, 1, 3% and 3%12% multivitamin (2 g of multivitamin per kg diet) were spread on commercial diet. The feed was oiered by 8 weeks. Results showed that ¢sh fed experimental diets had no signi¢cant diierence (P40.05) in speci¢c growth rates, condition factor, feed conversion ratios and survival compared with control. There were no signi¢cant difference (P40.05) in moisture, crude protein, crude lipid and ash content of common carp fed diets containing various levels of plant extract. The mortality of ¢sh challenged by Aeromonas hydrophila have been recorded for 30 days after challenging, results showed that mortality decreased signi¢cantly (Po0.05) in ¢sh fed diet containing plant extract compared with the control. The lowest mortality observed in group fed diet containing 3% plant extract. Haematological parameters showed that white blood cells had signi¢cantly (Po0.05) increased in infected and uninfected groups compared with the control. Red blood cells, haemoglobin and haematocrit had no signi¢cant change (P40.05) in infected and uninfected groups compared with the control.
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