Digestive enzymes in marine species. I. Proteinase activities in gut from redfish (Sebastes mentella), seabream (Sparus aurata) and turbot (Scophthalmus maximus)

• Published in: Comparative Biochemistry and Physiology Part B: Biochemistry and Molecular Biology
• Main Authors: Munilla-Morán, R., Saborido-Rey, Fran
• Format: Article in Journal/Newspaper
• Language: English
• Published: Elsevier 1996
• Subjects: Protein digestion; Proteases; Carnivorous fish; Stomach; Intestine; Sebastes mentella; Scophthalmus maximus; Sparus aurata; Turbot
• Online Access: http://hdl.handle.net/10261/59392; https://doi.org/10.1016/0305-0491(95)02057-8

8 páginas, 3 tablas, 5 figuras The proteolytic activities of the digestive tract of three carnivorous fish species (Sebastes mentella, Scophthalmus maximus, Sparus aurata) have been studied. The activity found in the stomach showed a pH optimum of 2.0 for all species, whereas this was in the alkaline range (9.5-10.0) in the intestinal extracts. Similar optimal temperature was measured for all species, although higher residual activities were detected at low temperatures in redfish and turbot. Lower E a values were detected in stomach than in intestine. The effect of NaC1 concentration on protein digestion differed between stomach and intestine being inhibitory in the former. The main proteolytic enzyme for the acid activity of the stomach of the three species seemed to be a pepsin. However, the enzymatic composition of the intestine was more species specific This work was supported by a grant from the Xunta de Galicia No. XUGA402OIB90. Peer reviewed