Open AccessEffects of Dietary Carbohydrate‐to‐lipid Ratio on Growth Performance, Body Composition, Digestive Enzyme Activities, and Hepatic Enzyme Activities in Juvenile Large Yellow Croaker, Larimichthys crocea
Author(s) -
Xing Shujuan,
Sun Ruijian,
Pan Xiaoyi,
Ma Jun,
Zhang Wenbing,
Mai Kangsen
Publication year - 2016
Publication title -
journal of the world aquaculture society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.655
H-Index - 60
eISSN - 1749-7345
pISSN - 0893-8849
DOI - 10.1111/jwas.12259
Subject(s) - biology , carbohydrate , medicine , endocrinology , digestive enzyme , triglyceride , feed conversion ratio , glycogen , protein efficiency ratio , composition (language) , enzyme , pyruvate kinase , amylase , zoology , juvenile , cholesterol , biochemistry , metabolism , glycolysis , ecology , body weight , linguistics , philosophy
An 8‐wk feeding trial was conducted to investigate the effects of dietary carbohydrate‐to‐lipid ratios ( CHO : L) on growth performance, body composition, digestive enzyme activities, and hepatic enzyme activities of juvenile large yellow croaker, Larimichthys crocea . Six isonitrogenous (45% crude protein) and isoenergetic (18 kJ/g gross energy) diets with varying CHO : L ratios (0.07, 0.48, 1.20, 2.19, 4.81, and 10.48) were fed to triplicate groups of large yellow croaker in floating sea cages. Results showed that the highest specific growth rate ( SGR ) was found in fish fed diets with CHO : L ratio of 2.19. Fish fed the lower (0.07 and 0.48) CHO : L ratios tended to produce lower growth ( P < 0.05). The whole‐body lipid content significantly decreased, while hepatosomatic index, liver glycogen content, and plasma glucose concentration significantly increased as dietary CHO : L ratios increased ( P < 0.05). Plasma total cholesterol, triglyceride, and low‐density lipoprotein cholesterol concentrations significantly decreased with elevated dietary CHO : L ratios ( P < 0.05). The increasing dietary CHO : L ratios significantly stimulated the activities of intestinal amylase and hepatic pyruvate kinase and depressed the activity of hepatic phosphoenolpyruvate carboxykinase ( P < 0.05). Based on a second‐order polynomial regression analysis of SGR , 2.38 was determined as the optimal dietary CHO : L ratio for juvenile large yellow croaker.