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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.

Artikel i vetenskaplig tidskrift
Författare Abroa R.
Kristina Sundell
Erik Sandblom
Henrik Sundh
Brännäs E.
Kiessling A.
Lindberg J-E.
T. Lundh
Publicerad i Comparative Biochemistry and Physiology - Part B: Biochemistry & Molecular Biology
Volym 175
Sidor 1-8
ISSN 1096-4959
Publiceringsår 2014
Publicerad vid Institutionen för biologi och miljövetenskap
Sidor 1-8
Språk en
Länkar http://dx.doi.org/10.1016/j.cbpb.2...
Ämneskategorier Zoofysiologi

Sammanfattning

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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