Effects of Daphnia magna fed with B group vitamins-enriched Chlorella sp. and Scenedesmus obliquus on the growth rate of Rutilus frisii kutum fry


1 Department of Marine Biology, Faculty of Marine Science and Technology, Science and Research Branch, Islamic Azad University, P.O.BOX:14155-775 Tehran, Iran

2 Department of Aquatic Health and Diseases, Faculty of Veterinary Medicine, Tehran University, P.O. Box: 14155-6453 Tehran, Iran


Currently, white fish or Kutum Rutilus frisii is considered to be a good candidate for commercial aquaculture. However, little information is available regarding the nutritional requirement of this fish fry. Experiments were conducted to examine the effects Daphnia magna as live food cultured on two freshwater green algae, Chlorella sp. and Scenedesmus obliquus enriched with different B group vitamin dosages (0.00 as control, 0.50, 1.00 and 2.00 mL of enriching solution per liter of algae culture medium) on the growth and survival rates of Rutilus frisii kutum fry. Results demonstrated that increasing in B group vitamin dosages are caused an increasing in nutritional value (Kcal) of two freshwater green algae species Chlorella sp. and Scenedesmus obliquus significantly. Significant differences were observed in BWG (%) and SGR between different vitamins treatments both the fed Daphnia magna cultured on Chlorella sp. and Scenedesmus obliquus enriched (P<0.05) but not in survival percentage (P>0.05).