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The effect of different food conversion strategies on the growth and survival rate of larvae and juveniles of Parabotia fasciata
LIU Xu, WEI Jie, WANG Yong-ming, SHI Jin-rong, XIE Bi-wen
HUBEI AGRICULTURAL SCIENCES
2024, 63 (5):
113-117.
DOI: 10.14088/j.cnki.issn0439-8114.2024.05.020
To investigate the effects of different food conversion strategies on the growth and survival rate of larvae and juveniles of Parabotia fasciata, and to explore the optimal food conversion strategy, 5 starting points for food conversion were set, namely the 7th day （W7 group）, 9th day （W9 group）, 11th day （W11 group）, 13th day （W13 group）, and 15th day （W15） groups after hatching out of the membrane, and 5 transition times for food conversion were designed, namely 2 days （W9-1 group）, 4 days （W9-2 group）, 6 days （W9-3 group）, 8 days （W9-4 group）, and 10 days （W9-5 group）. The results showed that after hatching out of the membrane for 23 days, the W13 group had the highest survival rate of 83.33%, which was significantly higher than the other groups;after hatching out of the membrane for 11-15 days and 15~19 days, there was no significant difference in the specific growth rate of experimental fish among the groups （P>0.05）. However, after hatching out of the membrane for 19~23 days, the specific growth rate of experimental fish in the W13 group was significantly lower than that in the other groups （P<0.05）;the body length and weight of fish in the W15 group were significantly higher than those in the other groups. The survival rate of experimental fish in the W9-5 group was significantly higher than that in the other groups. After hatching for 25 days, the survival rate of experimental fish in the W9-5 group was 89.30%;after hatching out of the membrane for 21~25 days, the specific growth rate of experimental fish in the W9-1 and W9-2 groups was significantly higher than that in the other groups （P<0.05）;the W9-5 group had the largest body length and weight, followed by the W9-4 group. The body length and weight of the other experimental groups decreased with the shortening of the transition time. Based on comprehensive analysis, it was recommended that the food conversing of larvae and juveniles of Parabotia fasciata started after hatching out of the membrane for 13 days, with 8 days as the optimal transition time for feeding.
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