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Morphological and histochemical study of intestine in wild and reared European eel (Anguilla anguilla L.)

Abstract

Diet-related differences between the ratio of intestine length to body size and the enzymatic activity in the intestinal tract of wild and reared European eel (Anguilla anguilla L.) were studied. Compared with reared eel, wild eel showed significantly shorter relative intestine length. For the purpose of histochemical examination, different parts (anterior, middle and posterior) of intestine proper were used. Activities of non-specific esterase, alkaline and acid phosphatase, and aminopeptidase were examined in each segment. All enzymes were present in the intestines of both wild and reared European eel. Fish from both groups showed similar enzyme distribution within the enterocytes, but distribution and intensity of enzyme activity along the intestine vary depending on the group. Generally, reared European eel showed highest enzymatic activity and wider distribution of enzymes throughout all parts of the intestine. These results suggest that different diets could be one of the reasons for observed changes.

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Acknowledgments

The authors would like to thank brothers Baždarić and K. Drašner who provided fish for the research. This study was supported by the Ministry of Science, Education and Sport of Croatia (project No. 053-0010501-2107).

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Correspondence to S. Kužir.

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Kužir, S., Gjurčević, E., Nejedli, S. et al. Morphological and histochemical study of intestine in wild and reared European eel (Anguilla anguilla L.). Fish Physiol Biochem 38, 625–633 (2012). https://doi.org/10.1007/s10695-011-9543-7

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  • DOI: https://doi.org/10.1007/s10695-011-9543-7

Keywords

  • European eel
  • Relative intestine length
  • Intestine enzymes
  • Enzyme histochemistry