Document Type : Nutrition
Authors
1
National Institute of Fisheries Research, Tehran, Iran
2
Artemia and Aquatic Animal Research Center, Urmia University, Urmia, Iran
3
Main Office of Education and Teaching of area̋, Tehran, Iran
Abstract
In order to improve the feeding method in economical Persian sturgeon (Acipenser persicus) from active feeding to 5 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 17.8 mm and 28.2 mg, respectively moved from Rajaii Complex Propagation, Sari to Artemia Research Center of Urmia University and after 5 days feeding with artemia nauplii, the length and weight reached to 21.4 mm and 50.5 mg, respectively. Hatching artemia cysts and daphnia production were done with standard method. Second stage of experimental feeding was started with 300 larval densities in each tank with length and weight of 21.4 mm and 50.5 mg, respectively with artemia nauplii (treatment 1), 50% artemia nauplii and 50% formulated diet (treatment 2), artemia nauplii enriched with vitamin C (treatment 3) and 50% artemia nauplii enriched with vitamin C and 50% formulated diet (treatment 4). During 15 days (end of the second stage) feeding was done 5 times frequency per day with 30% and 10% 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<0.05). The length of the forth treatment fish larvae was significantly lower than the others (P<0.05) but there were not differences between larval length in treatment 2 and 3 (P>0.05). In the third stage all the previous treatments were fed with three feeding trials, combinations of 50 and 25% of live food and the rest with formulated diet for ten days and at the end of this study, 45th 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>0.05) but at the end of experimental period, only treatment 1 of the second stage (100 artemia nauplii) which had been fed 50% artemia and formulated diet and 25% artemia and formulated diet selected as the best feeding model for reaching to 5g weight of fish fingerlings. Also, these treatments showed that the highest SGR, the lowest FCR and the highest survival rate after 72h exposed in 12 and 16 ppt salinity which had significant difference with the other treatment (P<0.05).
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