试验对鲇(SilurusasotusLinnaeus)消化道各部位的pH值和比肠长、比肠重、比胃重、比肝胰脏重、比内脏重等消化道指数及消化道内主要消化酶活性进行了测定。结果表明:鲇消化道从胃到后肠的消化液pH值变化较大,从胃液中的4.8￣6.2到后肠中的6.5￣7.0。胃液的酸性较强,不但有利于对食物的酸化,而且有利于胃蛋白酶作用的发挥。鲇比肠长为0.726±0.061,比胃重为0.027±0.006,比胰脏重为0.022±0.0029,低于杂食性鱼类和草食性鱼类,且随着鱼体的生长,其比胃重、比肠重、比肝胰脏重和比内脏重相对降低。鲇胃、前肠、中肠、后肠和胰液中蛋白酶的活性分别为(152.27±3.53)μg(/g·min)、(254.55±2.74)μg(/g·min)、(75.55±2.69)μg(/g·min)、(64.59±3.16)μg(/g·min)和(179.08±1.97)μg(/g·min),淀粉酶的活性分别为(242.05±4.24)mg(/g·h)、(196.67±1.59)mg/(g·h)、(166.41±1.06)mg(/g·h)、(151.28±2.25)mg(/g·h)和(1013.58±4.83)mg(/g·h),且差异显著(P<0.05)。这说明鲇为肉食性鱼类,其消化能力和消化道结构与食性相适应。 The digestive tract index and intestinal digestibility of digestive tract of Silurus asotus Linnaeus were determined. The indexes of digestive tract indexes such as intestine length, intestinal specific gravity, stomach weight, hepatopancreas weight and visceral weight, and major digestive enzymes in the digestive tract were determined. The results showed that: digestive tract from the stomach to the hindgut digestive juice pH value changes from 4.8 to 6.2 in the gastric juice to 6.5 to 7.0 in the hindgut. Strong acidity of gastric juice, not only conducive to the acidification of food, but also conducive to the role of pepsin play.鲇 than the intestine was 0.726 ± 0.061, than the stomach 0.027 ± 0.006, than the weight of pancreas 0.022 ± 0.0029, lower than omnivorous fish and herbivorous fish, and with the growth of fish, which is more than the stomach weight , Than the intestinal weight, liver and pancreas weight and visceral weight is relatively reduced. The activities of protease in stomach, foregut, midgut, hindgut and pancreatic juice were (152.27 ± 3.53) μg / g · min, 254.55 ± 2.74 μg / min and 75.55 ± 2.69, respectively. The activity of amylase was (242.05 ± 4.24) mg (g · min -1), (64.59 ± 3.16) μg / g · min and 179.08 ± 1.97 μg / (196.67 ± 1.59) mg / (g · h), (166.41 ± 1.06) mg / g · h, 151.28 ± 2.25 mg / g · h and 1013.58 ± 4.83 mg / g · h), and the difference was significant (P <0.05). This shows that 肉 carnivorous fish, its digestive ability and gastrointestinal structure and diet adapt.