Determination of Optimum Weaning Time of Shirbot (Barbus grypus Heckel, 1843) Larvae

Özet

The present study was conducted to determine the optimum weaning time of shirbot, Barbus grypus larvae withformulated diet. In this regard, shirbot larvae (8.98±0.06 mg) were fed with 8 experimental diet including A: (3 daysrotifer+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 formulateddiet), 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 interms of weight gain (WG) values (P>0.05). The values of specific growth rate (SGR) were not significant betweentreatments, 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±0.17mg), SGR (7.4±0.01 %) and LI (6.4±0.05 mm) compared to other experimental groups after 21 days experiment (P<0.05). thelowest 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 daysexperiment. Also, the maximum SR was observed in treatment E (98.5±0.3 %). the fish of treatment H (87.5±2.36 %) showedthe lowest survival rate (SR) compared to other experimental treatments. Results suggest that a 18 days use of live food isessential for larviculture of shirbot to obtain larvae with highly growth and survival.