Activity of intestinal mucosal brush border membrane enzymes in relation to the feeding habits of three aquaculture fish species

Sheenan Harpaz*, Zehava Uni

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

87 Scopus citations

Abstract

The activity of intestinal mucosal enzymes in various parts of the intestine and the pyloric caeca of adult fish from three different species was examined. Selection of the fish for the study was based on their aquacultural importance and the different feeding habits they exhibit: carnivorous hybrid striped bass (Morone saxatilisxMorone chrysops); omnivorous tilapia (Oreochromis niloticusxOreochromis aureus) hybrids and herbivorous silver carp (Hypophthalmichthys molitrix). The results show marked differences among the different fish species corresponding to their feeding habits. Sucrase and maltase activities were found to be highest in the midgut of all species compared to other regions of the intestines. The lowest activity of γ-glutamyltranspeptidase (γ-GT) was found in the foregut of all species compared to other regions of the intestines. Alkaline phosphatase and γ-GT activities in the pyloric caeca of tilapia and bass were similar to those found in the intestines, indicating that these organs are an extension of the intestines where active protein degradation takes place. Copyright (C) 1999 Elsevier Science Inc.

Original languageAmerican English
Pages (from-to)155-160
Number of pages6
JournalComparative Biochemistry and Physiology - A Molecular and Integrative Physiology
Volume124
Issue number2
DOIs
StatePublished - Oct 1999

Bibliographical note

Funding Information:
This study was supported, in part, by a grant obtained by S.H. from the Chief Scientist of the Ministry of Agriculture, Israel.

Keywords

  • Alkaline phosphatase
  • Gamma-glutamyl transpeptidase (γ-GT)
  • Hybrid striped bass
  • Intestinal mucosal enzymes
  • Silver carp
  • Tilapia

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