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¹ Department of Fisheries, Khuzestan Science and Research Branch, Islamic Azad University, Ahvaz, Iran
² Department of Fisheries, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
³ Department of Fisheries, Sari Agricultural Sciences and Natural Resources University, Sari, Iran DOI : 10.4194/1303-2712-v18_12_05 Viewed : 3855 - Downloaded : 3487 The present study was conducted to determine the optimum weaning time of shirbot, Barbus grypus larvae with formulated diet. In this regard, shirbot larvae (8.98±0.06 mg) were fed with 8 experimental diet including A: (3 days rotifer+18 days formulated diet), B: (6 days rotifer+15 days formulated diet), C: (9 days rotifer+12 days formulated diet), D: (12 days rotifer+9 days formulated diet), E: (15 days rotifer+6 days formulated diet), F: (18 days rotifer+3 days formulated diet), G: (21 days rotifer), H: (21 days formulated diet). All experiments were carried as random pattern with three replicates. According to the obtained results, there were no significant differences between treatments, A and B and also F and G in terms of weight gain (WG) values (P>0.05). The values of specific growth rate (SGR) were not significant between treatments, A and C and Also E, F and G (P>0.05). Also, there were no significant differences between treatments, A and B; D and E; E and G; F and G in terms of length increment (LI) values (P>0.05). The treatment F showed more WG (33.51±0.17 mg), SGR (7.4±0.01 %) and LI (6.4±0.05 mm) compared to other experimental groups after 21 days experiment (P<0.05). the lowest values of WG (13.35±0.14 mg), SGR (4.33±0.03 %) and LI (2.56±0.27 mm) was found in treatment H after 21 days experiment. Also, the maximum SR was observed in treatment E (98.5±0.3 %). the fish of treatment H (87.5±2.36 %) showed the lowest survival rate (SR) compared to other experimental treatments. Results suggest that a 18 days use of live food is essential for larviculture of shirbot to obtain larvae with highly growth and survival. Keywords : Rotifer, weaning time, formulated diet, shirbot, growth