AQUACULTURE NUTRITION

Effects of Dietary Carbohydrate Sources on Growth Performance, Digestive Enzyme and Carbohydrate Metabolic Key Enzyme Activities of Large Yellow Croaker (Larmichthys crocea Richardson)

  • LI Yi ,
  • ZHOU Piaoping ,
  • QIU Hong ,
  • HOU Yingmei ,
  • SHENTU Jikang ,
  • ZHOU Qicun
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  • 1. Laboratory of Fish Nutrition, Faculty of Marine Sciences, Ningbo University, Ningbo 315211, China;
    2. Ningbo Ocean and Fishery Research Institute, Ningbo 315010, China

Received date: 2015-05-27

  Online published: 2015-11-21

Abstract

An 8-week feeding trial was conducted to evaluate the effects of dietary carbohydrate sources on growth performance, digestive enzyme and carbohydrate metabolic key enzyme activities of large yellow croaker (Larmichthys crocea Richardson). Fish meal, wheat gluten and soybean meal were used as protein sources, fish oil, soybean oil and soybean lecithin were used as lipid sources, and wheat starch, corn starch, potato starch, dextrin, saccharose and glucose were used as carbohydrate sources, respectively, six isonitrogenous and isoenergetic diets were prepared. Each diet was randomly assigned to 3 replicates, and each replicate had 50 juvenile large yellow croaker with the initial average body weight of (7.06±0.48) g which were stocked in floating net cages (1.5 m×1.5 m×2.0 m), and were fed twice daily. The results showed as follows:fish fed the diets containing wheat starch or corn starch had significantly higher weight gain ratio (WGR), specific growth rate (SGR), feed efficiency (FE) and protein efficiency ratio (PER) than fish fed the diets containing saccharose or glucose (P<0.05). The highest hepatopancreas somatic index (HSI) occurred at glucose group, which was significantly higher than that in other groups (P<0.05). However, viscera somatic index (VSI), condition factor (CF), and crude protein, ash and moisture contents in whole body were not significantly affected by dietary carbohydrate sources (P>0.05), while fish fed the diets containing wheat starch, potato starch or corn starch had significantly higher crude lipid content in whole body than fish fed the diets containing dextrin, saccharose or glucose (P<0.05). Fish fed the glucose diet had the highest hepatic glycogen and the lowest muscle glycogen contents among all groups. The highest serum glucose content occurred in potato starch group, and it was significantly higher than that in the other groups (P<0.05). Fish fed the diets containing potato starch, corn starch or wheat starch had significantly higher intestinal amylase and lipase activities than fish fed the diets containing saccharose or glucose (P<0.05). The hepatic glucokinase (GK), phosphofructokinase (PFK), phosphofructokinase (PK) activities were significantly influenced by dietary carbohydrate source (P<0.05), while no significant difference in hepatic fructose 1,6-diphosphate aldolase (FBPase) activity was found in all groups (P>0.05). These results indicate that large yellow croaker had better utilization of polysaccharide such as wheat starch and corn starch than saccharose and glucose.

Cite this article

LI Yi , ZHOU Piaoping , QIU Hong , HOU Yingmei , SHENTU Jikang , ZHOU Qicun . Effects of Dietary Carbohydrate Sources on Growth Performance, Digestive Enzyme and Carbohydrate Metabolic Key Enzyme Activities of Large Yellow Croaker (Larmichthys crocea Richardson)[J]. Chinese Journal of Animal Nutrition, 2015 , 27(11) : 3438 -3447 . DOI: 10.3969/j.issn.1006-267x.2015.11.015

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