Effects of Formulated Feed and Chilled Trash Fish on Growth Performance and Meat Quality of Largemouth Bass Micropterus salmoides
SHAO Junjie1, ZHONG Liqiang1, ZHU Yuxuan2, ZHANG Shiyong1, WAN Jinjuan1, CHEN Fengwei1, ZHANG Meiqin1, CHEN Xiaohui1, LIU Guoxing1, WANG Minghua1
1. Freshwater Fisheries Research Institute of Jiangsu Province, Nanjing 210017, China; 2. Key Laboratory of Pesticide Environmental Assessment and Pollution Control, Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China
Abstract：To study the effects of different origins of feed on growth and meat quality of largemouth bass Micropterus salmoides, the growth performance, and muscular nutritional composition, colour, water-holding capacity, texture and myofibril characteristics were evaluated in largemouth bass fed with formulated feed, chilled trash fish and mixed feed (the mass ratio of formulated feed and trash fish at 1∶1). The results showed that the fish in the chilled trash fish group behaved significantly better than formulated feed group on growth, and the growth performance of the fish in the mixed feed group was between the above 2 groups. However, the fish in the formulated feed group exhibited a lower feed conversion ratio. In comparison with formulated feed and mixed feed groups, the fish in the chilled trash fish group exhibited highest content of crude fat (P<0.05). The highest values of redness (a*) (6.51±1.10) and the lowest yellowness (b*) (4.81±0.69) were obtained in the chilled trash fish group. The centrifugal loss and liquid loss were significantly higher in formulated feed group than those fed with chilled trash fish (P<0.05). Meanwhile, the cooked rate (73.15%) was significantly lower in the fish in the formulated group than that in the mixed feed group (78.04%) and chilled trash fish group (77.81%) (P<0.05). In terms of the texture profile, the hardness and chewiness in the chilled trash fish group were enhanced significantly (P<0.05). Additionally, compared with formulated feed group, the muscle fibers in chilled trash fish and mixed feed groups had the characteristics of smaller diameter and higher density. In conclusion, under given conditions, chilled trash fish was more appropriate to improve the growth and muscle quality of largemouth bass compared with formulated feed, but the fish in the formulated feed group had lower feed conversion ratio and higher feed utilization rate. Therefore, in order to reduce the dependence on chilled trash fish and promote the sustainable and healthy development of largemouth bass culture, the further studies and developments of formulated feed need to be considered from nutritional composition of chilled trash fish, nutritional requirements and physiological characteristics of largemouth bass.
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2023, Vol. 42 
