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              The Evaluation of Growth Performance of Three Largemouth Bass Strains Based on Indoor Recirculating Aquaculture System

              DATE:28 September 2021        SOURCE:中國農學通報

              Abstract:

              The present trial was conducted to evaluate the growth performance of three largemouth bass Micropterus salmoides strains based on indoor recirculating aquaculture system. M. salmoides juveniles of the three stains, including ‘Youlu No.1’, ‘Youlu No.3’ and ‘Zhelu No.2’ were assigned randomly into 9 tanks with triplicate tanks for each stain respectively. Each tank had 30 fish (initial body weight 6.08±0.12g) and the feeding trial lasted 8 weeks. The results showed that the survival rate was all above 98.89% (P>0.05); the body weight gain ranked as ‘Youlu No.3’>‘Youlu No.1’>‘Zhelu No.2’ without significant differences (P>0.05); while the lowest variable coefficients of body length and weight were both observed in ‘Zhelu No.2’(P>0.05). The morphological indices among the three strains showed no significant differences (P>0.05). The higher feed coefficient rate and protein efficiency ratio were found in ‘Zhelu No.2’ and ‘Youlu No.3’, respectively (P<0.05). There was no significant difference of dorsal muscle composition and amino acids’ content among the three stains (P>0.05). The activities of trypsin in gut and liver were significantly lower in ‘Zhelu No.2’ than those in other stains (P<0.05). Ten parameters contents in serum maintained stability and no statistic difference existed among the three stains (P>0.05). The data generated from the current trial suggest that M. salmoides is an appropriate fish species for indoor recirculating aquaculture, and ‘Youlu No.3’ shows relative better growth performance in the present system. ‘Zhelu No.2’ also shows very considerable body weight gain, nutrient composition as well as resistance when compared with ‘Youlu’ stains, providing good potential as a breeding population.

              Key words: Micropterus salmoides, strains, growth, feed utilization, nutrient composition, digestive enzyme activities, serum parameters, recirculating aquaculture system


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