Digestive Ability and Nutritive Value of Silurus asotus
XIANG Xiao ① YE Yuan Tu ② ZHOU Xing Hua ① LIN Shi Mei ③ LUO Li ③ (①Collage of Fisheries, Southwest Agricultural University, Chongqin 402460; ②Suzhou University, Suzhou 215006; ③Southwest Agricultural University, Chongqing 400716,China)
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,P0 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 intestinehepatopancreasstomachmiddle intestine posterior intestine and the activity of amylase was in the order of hepatopancreasstomachanterior intestinemiddle intestineposterior 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.
【CateGory Index】： S917