Comparative analysis of growth performance,physiological and biochemical indices,and muscular texture of frail meat tilapia and common tilapia in land-based round pond
The purpose of this experiment was to study the differences of growth performance,physiological and biochemical indices,and muscular texture comparisons between frail meat tilapia and common tilapia under land-based round pond aquaculture conditions.A total of 6 000 tilapia with an initial body weight of(401.62±1.42)g were selected,and were divided into common tilapia and frail meat tilapia groups.Each treatment group had three replicates,with 1 000 fish per replicate.They were fed with regular feed and crisping feed,respectively.The pre trial period was two weeks,and the formal trial period was 90 days.The results showed that the final body weight,weight gain rate,specific growth rate,and yield of the common tilapia group were significantly higher than those of the frail meat tilapia group(P<0.05),while the feed coefficient was significantly lower(P<0.05).The crude fat content and water content of the common tilapia group were significantly higher than those of the frail meat tilapia group(P<0.05).The activities of alkaline phosphatase and lysozyme in the frail meat tilapia group were significantly lower than those in the common tilapia group(P<0.05),and the activities of total superoxide dismutase,catalase,and glutathione peroxidase were significantly reduced(P<0.05),with a significant increase in the malondialdehyde content(P<0.05).The hardness,elasticity,chewiness,adhesiveness,and shear force of the frail meat tilapia were all significantly increased(P<0.05),while cohesiveness was significantly decreased(P<0.05),and muscle frailness was significantly increased.The study indicates that under land-based round pond conditions,compared to common tilapia,the growth performance,immunity and antioxidant capacity of frail meat tilapia are reduced,but there is a marked improvement in the muscular frailness.
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