In order to improve the feeding method in economical Persian sturgeon (Acipenser persicus) from active feeding to ????g weight, alternative nutritional such as un-enriched and enriched artemia nauplii with vitamin C, daphnia, formulated diet and their combinations were used. Fish larvae in active feeding with initial length and weight of ????????????????mm and ???????????????? mg, respectively moved from Rajaii Complex Propagation, Sari to Artemia Research Center of Urmia University and after ???? days feeding with artemia nauplii, the length and weight reached to ????????????????mm and ????????????????mg, respectively. Hatching artemia cysts and daphnia production were done with standard method.
Second stage of experimental feeding was started with ???????????? larval densities in each tank with length and weight of ????????????????mm and ????????????????mg, respectively with artemia nauplii (treatment ????), ???????????? artemia nauplii and ???????????? formulated diet (treatment ????), artemia nauplii enriched with vitamin C (treatment ????) and ???????????? artemia nauplii enriched with vitamin C and ???????????? formulated diet (treatment ????). During ???????? days (end of the second stage) feeding was done ???? times frequency per day with ???????????? and ???????????? of body weight from live food and formulated diet. The results showed that weight of the first treatment's larvae was significantly higher than the other treatments (P<????????????????). The length of the forth treatment fish larvae was significantly lower than the others (P<????????????????) but there were not differences between larval length in treatment ???? and ???? (P>????????????????). In the third stage all the previous treatments were fed with three feeding trials, combinations of ???????? and ???????????? of live food and the rest with formulated diet for ten days and at the end of this study, ????????th days, all fish larvae were fed only with formulated diet. The results showed that all fish larvae of the second stage which
had been fed artemia and formulated diet, had good and regular growth rate which there were not significantly differences between them (P>????????????????) but at the end of experimental period, only treatment ???? of the second stage (???????????? artemia nauplii) which had been fed ???????????? artemia and formulated diet and ???????????? artemia and formulated diet selected as the best feeding model for reaching to ????g weight of fish fingerlings. Also, these treatments showed that the highest SGR, the lowest FCR and the highest survival rate after ????????h exposed in ???????? and ????????ppt salinity which had significant difference with the other treatment (P<????????????????).