The effects of copper, iron and zinc on digestive enzyme activity in the hybrid tilapia Oreochromis niloticus (L.) x Oreochromis aureus (Steindachner)
文献类型: 外文期刊
作者: Li, J. -S. 1 ; Li, J. -L. 2 ; Wu, T. -T. 2 ;
作者机构: 1.Nanjing Agr Univ, Coll Food Sci & Technol, Nanjing 210095, Peoples R China
2.Nanjing Agr Univ, Coll Food Sci & Technol, Nanjing 210095, Peoples R China; Chinese Acad Fishery Sci, Freshwater Fisheries Res Ctr, Wuxi 214081, Peoples R China
关键词: copper;digestive enzyme;iron;tilapia;zinc
期刊名称:JOURNAL OF FISH BIOLOGY ( 影响因子:2.051; 五年影响因子:2.25 )
ISSN: 0022-1112
年卷期: 2007 年 71 卷 6 期
页码:
收录情况: SCI
摘要: The present experiment was conducted to study effects of Cu, Fe and Zn on activities of digestive enzymes of the hybrid tilapia Oreochromis niloticus x Oreochromis aureus. The acidic protease activities increased 65.5 and 55.1% by addition of homogenates of digesta-containing stomach with copper (75 mg l(-1)) and zinc (50 mg l(-1)) respectively. Addition of Cu and Zn increased the activities of protease in the hepatopancreas homogenates by 132.7 and 38.1% respectively, and reduced the activity of protease in the digesta-containing intestine homogenates by 11.0 and 13.8% respectively. Addition of Fe (50 mg l(-1)) increased the acidic protease activity by 96.7% but did not alter the activities of protease in the intestine and hepatopancreas. Addition of Cu markedly inhibited activities of amylase in intestine and hepatopancreas homogenates, while Zn addition showed no effects. Addition of Fe reduced activities of amylase in the intestine homogenates by 47.9% but had no effect on amylase activities in the hepatopancreas. When Cu (75 mg kg(-1)), Fe (50 mg kg(-1)) and Zn (50 mg kg(-1)) were supplemented to basal diet for 3 weeks, the activities of amylase in hepatopancreas homogenates increased 125.3, 215.6 and 70.0%, respectively, the activities of amylase in intestine increased 79.8, 74.6 and 48.5%, respectively, and the activities of lipase in intestine increased 90.5, 149.8 and 84.0%, respectively. Supplementation of Cu, Fe or Zn into diet had no effects on activity of protease in all digestive organs. Therefore, the results suggest that effects of Cu, Fe and Zn on activity of digestive enzymes in vitro were different from those seen in vivo, and that the positive effects of Cu, Fe and Zn supplemented to fish diet would be valuable information for formulating fish feed. (C) 2007 The Authors.
- 相关文献