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Effects of dissolved oxygen and dietary lysine levels on growth of grass carp
1,2 2 2 2,3 2 2 2
2
1 Animal Science College, South China Agricultural University, Guangzhou, China; 2 School of Life Science, Sun Yat-Sen
University, Guangzhou, China; 3 Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization, Ministry
of Agriculture, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi, China
In order to investigate the effects of lysine and dissolved
oxygen on grass carp, the grass carp were fed with 13, 15
and 17 g kg 1 lysine diet at about 6 mg L1 (high dis-
solved oxygen, HO group) or 3.5 mg L1 (low dissolved
oxygen, LO group) dissolved oxygen level, for 8 weeks.
The fish were fed to apparent satiation by hand. The
results showed that apparent digestibility of protein, energy
and dry matter were decreased significantly when grass
carp were fed at 3.5 mg L1 dissolved oxygen, and feed
intake (FI) was also inhibited by low dissolved oxygen
(P 0.05). Weight gain, protein retention, protein effi-
ciency, feed conversion ratio and amino acid retention of
fish at 6 mg L1 dissolved oxygen level were significantly
improved at 3.5 mg L1 dissolved oxygen level (P 0.05).
Weight gain, protein and amino acid retention, and feed
efficiency of grass carp at the two dissolved oxygen levels
were significantly improved by lysine supplementation
(P 0.05). The dietary lysine level and dissolved oxygen of
water had an interaction effect on feed conversion ratios
(P 0.05). Grass carp fed at low dissolved oxygen level
showed lower liver protein and fat contents. Plasma aspar-
tate aminotransferase (AST) activity of grass carp fed at
3.5 mg L1 dissolved oxygen level was significantly
increased compared to 6 mg L1 dissolved oxygen level
(P 0.05). Our results show that low dissolved oxygen
level of water is harmful to the liver of grass carp.
KEY WORDS: Ctenopharyngodon idella, lysine, oxygen
Received 28 December 2011; accepted 14 November 2012
Correspondence: Yong-Jian Liu, Institute of Aquatic Economic Animals
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