Journal of Tianjin Agricultural University ›› 2024, Vol. 31 ›› Issue (5): 59-66.doi: 10.19640/j.cnki.jtau.2024.05.009

• Researches and Scientific Notes • Previous Articles     Next Articles

Effects of the replacement dietary fishmeal with hydrolysed porcine mucosa and plant protein complexes on growth performance, body composition and antioxidant capacity of juvenile Largemouth bass(Micropterus salmoides

Han Zhihao1a, Wang Zhenjie1a, Gong Ye1a, Xie Ruitao2, Chen Naisong1a,1b, Li Songlin1a,1b,Corresponding Author   

  1. 1. Shanghai Ocean University, a. Centre for Research on Environmental Ecology and Fish Nutrition, Ministry of Agriculture and Rural Affairs, b. National Demonstration Center for Experimental Fisheries Science Education, Shanghai 201306, China;
    2. Guangdong Evergreen Feed Industry Co., Ltd., Zhanjiang 524000, Guangdong Province, China
  • Received:2023-10-11 Online:2024-10-31 Published:2024-11-05

Abstract: The aim of this experiment was to investigate the effects of a combination of hydrolysed porcine mucosa and plant proteins as an alternative protein source for fishmeal on growth performance, body composition and antioxidant capacity of juvenile Largemouth bass(Micropterus salmoides). Four isonitrogenous(51% crude protein)and isolipid(12% crude lipid)diets were formulated with a graded replacement of fishmeal by a composite mixture of hydrolysed porcine mucosa and plant proteins(corn gluten meal and fermented soybean meal). The fishmeal content of the test diets were 40%(FM40), 35%(FM35), 30%(FM30)and 25%(FM25)with three replicates per group. Largemouth bass with an initial body weight of(5.05±0.02)g were fed twice a day on an apparent satiation for 70 days. The results indicated that 12.5 % of dietary fishmeal could be replaced without affecting growth performance. Meanwhile, the addition of complex protein increased feed efficiency rate(FER)and protein efficiency rate(PER), which was significantly increased in the FM35 group(P<0.05). Substitution of fishmeal with complex protein did not have significant effects on moisture, protein, lipid and ash of whole fish(P>0.05). Additionally, the replacement of fishmeal did not have significant effects on serum alanine transaminase(ALT)and aspartate transaminase (AST)activities(P>0.05). In terms of hepatic antioxidant capacity, the addition of complex proteins significantly reduced the malondialdehyde(MDA)content. The total antioxidant capacity(T-AOC)of the FM35 group did not produce a significant difference from that of the FM40(control)(P>0.05), but the other treatment groups were significantly lower than that of the FM40(control)(P<0.05). The hepatic catalase(CAT)and superoxide dismutase(SOD)in the liver were not significantly affected by the complex proteins substitution, but FM35 showed a slight increase compared to FM40(control)(P>0.05). It is concluded that replacement of fishmeal by a combination of hydrolysed porcine mucosa and plant proteins could reduce the fishmeal content of juvenile Largemouth bass diets from 40% to 35% without affecting growth performance and liver health indicators.

Key words: Largemouth bass, hydrolysed porcine mucosa, fishmeal replacement, growth performance, body composition, antioxidant capacity

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