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Evaluation of chitinolytic activities and membrane integrity in gut tissues of Arctic charr (Salvelinus alpinus) fed fish meal and zygomycete biomass.

Journal article
Authors Abroa R.
Kristina Sundell
Erik Sandblom
Henrik Sundh
Brännäs E.
Kiessling A.
Lindberg J-E.
T. Lundh
Published in Comparative Biochemistry and Physiology - Part B: Biochemistry & Molecular Biology
Volume 175
Pages 1-8
ISSN 1096-4959
Publication year 2014
Published at Department of Biological and Environmental Sciences
Pages 1-8
Language en
Links http://dx.doi.org/10.1016/j.cbpb.2...
Subject categories Animal physiology

Abstract

Chitinolytic activity, nutrient uptake and intestinal barrier functions were investigated in gut tissues of Arctic charr (Salvelinus alpinus) fed iso-nitrogenous diets based on fish meal, with or without inclusion of zygomycetes (Rhizopus oryzae). We found that gut tissue of Arctic charr had significant chitinase activity, of both endo- and exo-chitinase iso-forms. Moreover, the distribution pattern along the GI tract of Arctic charr differed between endo-chitinase and exo-chitinase. The endo-chitinase activity in stomach tissue and in the distal intestine was several hundred-fold higher than the exo-chitinase activity in stomach tissue. The greatest exo-chitinase activity was found in the distal intestine. The zygomycete-based diet resulted in higher chitinolytic activity in gut tissue compared to the fish meal-based diet. Disturbed intestinal integrity and increased uptake rate of the amino acid lysine were observed in the distal, but not proximal, intestine of fish fed the zygomycete-based feed.

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