Theses and Dissertations

Title: Comparative studies of the digestive enzymes of the goldfish and the largemouth black bass

Name: Sarbahi, Daya Shankar

Degree: MS

Chair: Dr. John Stiles Dendy


University: Auburn

Location: Auburn, Alabama

Date: 1950

Pages: 52

Keywords: Digestive Enzymes,Goldfish,Largemouth Bass.


A study of the digestive tract and the associated glands and the diggestive enzymes of goldfish, Carassius auratus and largemouth black bass, Micropterus salmoides revealed the following: the diggestive tract in goldfish is an elongated relatively undifferentiated tube but could be separated into several divisions by the character of the epithelial lining. A true stomach, comparable to that of largemouth black bass and other bony fishes, is absent: its place is taken up by an enlargement of the intestine, the intestinal bulb. The bile and pancreatic ducts open on the roof of the bulb a short distance behind the valve-like structure separating the bulb from the oesophagus.Of the three proteinases studied, trypsin was the only enzyme found in extracts from hepato-pancreas, intestinal bulb, anterior intestine and posterior intestine of goldfish: and was active in a greater part of the tract in the intestinal bulb, anterior intestine and posterior intestine. In largemouth bass, however, both pepsin and trypsin were found, the former in extracts from stomach, the latter in extracts from liver, pancreas, pyloric caeca. The action of pepsin was limited to the lumen of stomach: the trypsin was active in the stomach duodenum and small intestine. Of the four carbohydrases studied, amylase, maltase, and invertase were found in extacts from hepato-pancreas, oesophagus, intestinal bulb, anterior and posterior intestine of goldfish. These were active in the intestinal bulb, anterior and postrior intestine. In largemouth bass, carbohydrases were conspicuous by their absence. Lipase was found in extract from the hepato-intestine of goldfish. In largemouth bass, lipase was found in extracts from liver and pyloric caeca and was active in the duodenum and small intestine.

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