Effects of dietary L-arginine or N-carbamoylglutamate on intestinal mucosal morphology and intestinal flora of hybrid snakehead Channa maculata (♀)×C. argus (♂)

• LI Peijia, 
• HOU Dongqiang, 
• ZHAO Hongxia, 
• HUANG Wen, 
• ZHENG Chuntian, 
• CAO Junming