تأثير دفعات غذادهي بر ميزان رشد و بازماندگي لارو ماهي سفيد درياي خزر (Rutilus frisii kutum, kamensky1901)

The effect of feeding frequency on the growth and survival white fish larval in Caspian Sea(Rutilus frisii kutum,kamensky 1901)

One of important matters in aquaculture is acquire balance between rapid fish growth and optimum use of provided food. In culture kutum larval, feeding management is very important because suitable feeding in a good time can decrease survival and increase growth. This study has done with 8 treatments and 3 times repetition: Treatment A:one time feeding per day in 8 oʹclock , Treatment B:two times feeding per day in 8 and 11 oʹclock , Treatment C:three times feeding per day in 8 , 11 and 14 oʹclock , Treatment D:four times feeding per day in 8, 11, 14 and 17 oʹclock. Each of treatments in this examination feeding regularity at 8,11,14,17 hours. Itʹs necessary to attention that rate of feeding is based on 15 percent of whole weight of larval body fishes on a day. Results indicated there was significant difference between weight and length gain(p<0/05).larval that feeding one time per day have most increasing weight and length and with increase numbers of feeding their weight and length decreased.