【摘要】 采用常规方法测定了鲇(Silurusasotus)的消化道指数,其比肠长、比胃重、比肠重、比肝胰脏重和比内脏重分别为0726±0087、0027±0015、0013±0008、0022±0004和0081±0041。体重与体长的回归方程Y=00124X2.8451(r=09940,P<001);鲇的胃、前肠、中肠和后肠中消化液的pH值分别为48～62、66～70、69～75、72～77,且消化道各部分具有较高的蛋白酶和淀粉酶活性,蛋白酶的活性为前肠>胰脏>胃>中肠>后肠;而淀粉酶的活性则为胰脏>胃>前肠>中肠>后肠;肌肉中粗蛋白的含量1881%,粗脂肪含量152%;必需氨基酸含量占氨基酸总量的4451%,鲜味氨基酸含量占氨基酸总量的4598%,综合肌肉的常规营养成分和氨基酸分析的结果,鲇是一种营养价值较高的优质鱼类。更多还原

【Abstract】 The digestive tube indices of Silurus asotus were evaluated. The ratio of intestine length to body length was 0 726±0 087, while the ratio of stomach, intestine, hepatopancreas or viscera weight to body weight were 0 027±0 015,0 013±0 008,0 022±0 004,and 0 081±0 041,respectively.The regression of body weight with body length was Y=0 0124X 2.845?1 (r=0 994?0,P<0 01). The pH value of stomach, anterior intestine, middle instestine, posterior intestine and hepatopancreas were 4 8-6 2,6 6-7 0,6 9-7 5,and 7 2-7 7,respectively. The protease activity and amylase activity were measured in the digestive gut. It was shown that the activity of protease was arranged in the order of anterior intestine>hepatopancreas>stomach>middle intestine >posterior intestine and the activity of amylase was in the order of hepatopancreas>stomach>anterior intestine>middle intestine>posterior intestine. The crude protein proportion in the muscle was 18 81% and the crude fat proportion was 1 52%. The essential amino acids accounted for 44 51% of total amino acids, and the delicious amino acid accounted for 45 98% of total amino acids. It is indicated that the nutritive value of Silurus asotus is higher than that of the common carp or grass carp.更多还原