ABSTRACT An experimental trial was conducted to investigate the effects of high dietary starch levels on growth, hepatic glucose metabolism enzyme, antioxidant capacity and immune responses of largemouth bass, Micropterus salmoides. Fish (initial body weight: 16.9±0.24g) were fed three isonitrogenous and isoenergetic semi‐purified diets containing 5%, 10% and 20% wheat starch, respectively. The results indicated that fish fed 5% and 10% starch diets showed significantly better weight gain, specific growth rate (SGR), protein efficiency ratio (PER) and feed conversion ratio (FCR) compared with that fed 20% starch diet. Meanwhile, fish fed 20% starch diet had a significantly higher hepatic glycogen and muscle glycogen contents than those fed the other diets. The alanine amiotransferase (ALT) and aspartate transaminase (AST) activities, glucose and insulin contents in plasma increased significantly with dietary starch levels, whereas triglyceride content showed the opposite trend. In addition, the highest glucokinase (GK), pyruvate kinase (PK) and phosphofructokinase (PFK) activities in liver were also observed in fish fed 20% starch diet. However, both fructose‐1,6‐bisphosphatase (FBPase) and pyruvate carboxylase (PC) activities in liver decreased significantly as dietary starch levels increased. Moreover, the lower superoxide dismutase (SOD) and catalase (CAT), the higher malondialdehyde (MDA) contents in liver were observed in fish fed 20% starch diets. Compared to the 5% and 10% starch, the 20% starch could enhance the content of plasma nitric oxide (NO) and the activities of inducible nitric oxide synthase (iNOS) and alkaline phosphatase (ALP). Results demonstrate that the starch levels may affect growth performance and metabolic changes, which suggest that high‐starch diets were inefficiently used as an energy source by M. salmoides juveniles. Excessive dietary starch contents could result in oxidative stress, suppress innate immunity, and thus affect the health status of M. salmoides. HIGHLIGHTSThe starch levels may affect growth performance of M. salmoides.High starch was inefficiently used as an energy source by M. salmoides juveniles.High dietary starch could result in oxidative stress of the fish.High dietary starch could suppress innate immunity of the fish.
Effect of high dietary starch levels on growth, hepatic glucose metabolism, oxidative status and immune response of juvenile largemouth bass, Micropterus salmoides
Shi‐Mei Lin,Chao-Ming Shi,Ming-Ming Mu,Yong‐Jun Chen,L. Luo
Published 2018 in Fish and Shellfish Immunology
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PUBLICATION RECORD
- Publication year
2018
- Venue
Fish and Shellfish Immunology
- Publication date
2018-07-01
- Fields of study
Agricultural and Food Sciences, Medicine, Biology
- Identifiers
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- Source metadata
Semantic Scholar, PubMed
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