Effects of two dietary fish meal levels on growth performance and feed utilization of 9 <italic>Penaeus monodon</italic> families

Abstract

Effects of dietary fish meal levels (30%, 20%) on growth performance and feed utilization of <italic>Penaeus monodon</italic> from 9 families were conducted under laboratory conditions. Results showed that there was no significant difference in specific growth rate (SGR), survival rate(SR), feed conversion ratio (FCR) and apparent feed dry matter digestibility between 9 <italic>Penaeus monodon</italic> families fed with two dietary fish meal levels. Survival rates of families No. 1, No. 3, No. 5 and No. 9 in 20% fish meal level diet group were (58.89±4.84)%,(55.56±10.94)%,(73.34±8.82)%,(64.44±5.88)%, respectively, which were significantly higher than those of other families. Two-way ANOVA analysis showed that there was no significant interaction between dietary fish meal levels and <italic>P</italic>. <italic>monodon</italic> famiies. The growth performance and feed utilization of <italic>P</italic>. <italic>monodon</italic> families were not related to dietary fish meal levels, but to genetic factors of <italic>P</italic>. <italic>monodon</italic>, when the diet protein level was high, the phenotypic difference reduced, and when the diet protein level was low, the significant difference of the genetic effect of growth was obvious. The results provide a theoretical basis and data reference for screening fine strains adapted to low dietary fish meal level through family breeding.