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Ontogeny of protease, amylase and lipase in the alimentary tract of hybrid Juvenile tilapia (Oreochromis niloticus x Oreochromis aureus)

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文献类型：外文期刊

作者： Li Jun-sheng ¹ ; Li Jian-lin ² ; Wu Ting-ting 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： Tilapia;Digestive enzyme;Ontogeny

期刊名称：FISH PHYSIOLOGY AND BIOCHEMISTRY （影响因子：2.794；五年影响因子：2.876 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Juvenile tilapias (Oreochromis niloticus x O. aureus), with average body weights of groups I, II and III of 55.14, 122.82, and 225.68 g respectively were used to study changes in the activity of protease, amylase, and lipase in different organs and sections of the alimentary tract. Additionally, tract containing digesta, which is closer to physiological conditions, may help reveal the mechanisms of whole chemical digestion process. Another group of tilapias (mean body weight of 111.81 ± 0.14 g) wasused to analyze changes in activity of protease, lipase, and amylase in response to varying pH and temperatures. The activity of enzymes in all digestive organs increased when body weight increased from 55 to 122 g, and the activity further increased when the weights increased from 122 to 225 g. The rates of increase in digestive enzyme activity were significantly greater than the rates of growth of the fish. When the activity was compared in different sections of the tract, a similar regularity was found for the three enzymes in all fish. The highest amounts of activity were seen in the foregut and the lowest in the rectum, with the middle amount of activity in the hindgut. The pH ranges for the maximum activity of tilapia protease in the stomach andintestine were 1.6-3.3 and 9.5-10.5 respectively and the optimal temperature in these organs was 55°C. The pH ranges for the maximum amylase activity in the intestine and hepatopancreas were 6-7 and 7.5 respectively, and high amylase activity in these organs was found at 25-35°C. The activity of lipase in the intestine remained unchanged at pH 6.0-9.0 and with temperatures between 25 and 35°C. These results suggest that the ability of tilapia to utilize feed varies at different growth stages and remains relatively stable with changes in environmental pH and temperature, which should be taken into account when designing feed formulas for tilapia.

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Ontogeny of protease, amylase and lipase in the alimentary tract of hybrid Juvenile tilapia (Oreochromis niloticus x Oreochromis aureus)

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Ontogeny of protease, amylase and lipase in the alimentary tract of hybrid Juvenile tilapia (Oreochromis niloticus x Oreochromis aureus)

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