Premium
Carbohydrate utilization by herbivorous and omnivorous freshwater fish species: a comparative study on gibel carp ( C arassius auratus gibelio . var CAS III ) and grass carp ( C tenopharyngodon idellus )
Author(s) -
Li Xiangsong,
Zhu Xiaoming,
Han Dong,
Yang Yunxia,
Jin Junyan,
Xie Shouqi
Publication year - 2016
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/are.12476
Subject(s) - grass carp , carp , biology , starch , omnivore , zoology , carbohydrate , feed conversion ratio , triglyceride , food science , fishery , biochemistry , endocrinology , fish <actinopterygii> , ecology , body weight , cholesterol , predation
Two 8‐week feeding trials were conducted to evaluate dietary carbohydrate utilization by omnivorous gibel carp ( C arassius auratus gibelio ) (2.4 ± 0.1 g) and herbivorous grass carp ( C tenopharyngodon idellus ) (6.5 ± 0.1 g). Five isonitrogenous (370 g kg −1 ) and isolipid (70 g kg −1 ) diets were formulated with increasing corn starch levels (60, 140, 220, 300 and 380 g kg −1 ). Results showed that specific growth rate ( SGR ), feed efficiency ( FE ) and protein retention efficiency ( PRE ) of gibel carp significantly increased from dietary starch of 60 to 300 g kg −1 and then decreased from 300 to 380 g kg −1 , but those of grass carp showed no significant differences between treatments. Independent of dietary starch levels, grass carp gained significantly higher FE and PRE than gibel carp. Feeding rate ( FR ) of gibel carp was significantly higher than that of grass carp. In two fish species, high dietary starch (300 and 380 g kg −1 ) tended to obtain higher hepatosomatic index ( HSI ), serum triglyceride, hepatic lipid and body lipid contents. Serum glucose concentration of grass carp was not affected, while that of gibel carp fed the starch of 300 g kg −1 diet was significantly lower than those of the fish fed other four diets (60, 140, 220 and 380 g kg −1 ). Grass carp showed high tolerance to dietary starch while dietary corn starch should be no more than 300 g kg −1 for gibel carp. High starch contents may cause lipid accumulation in the liver and body.