open access

Vol 50, No 2 (2012)
Original Papers
Published online: 2012-07-04
Submitted: 2012-01-19
Accepted: 2012-01-19
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Morphological differences in the skin of marble trout Salmo marmoratus and of brown trout Salmo trutta

Urška Sivka, Karel Halačka, Simona Sušnik Bajec
DOI: 10.5603/FHC.2012.0034
·
Folia Histochem Cytobiol 2012;50(2):255-262.

open access

Vol 50, No 2 (2012)
Original Papers
Published online: 2012-07-04
Submitted: 2012-01-19
Accepted: 2012-01-19

Abstract

Despite being genetically very closely related, the marble trout Salmo marmoratus and the brown trout Salmo trutta exhibit marked phenotypic differences, particularly with regard to skin pigmentation. Histological analysis of skin from the head and gill cover of differently aged individuals of the two species was carried out in order to characterize differences in skin structure. The basic structure of skin of the individuals studied corresponded with that described for other salmonids, though the head epidermis was somewhat thicker in S. marmoratus than in S. trutta, thickening with age in both species. Numerous secretory goblet cells and sporadic secretory sacciform cells were observed in the upper and middle part of the epidermis in both species. Melanophores were present in both species only in the dermis, and were bigger in S. marmoratus and present at lower average density than in S. trutta, and more or less constant across all age classes. In adult S. marmoratus with fully established marble pigmentation, light areas at low density with small (i.e. aggregated) melanophores were present, while in S. trutta melanophores were more uniformly distributed.

Abstract

Despite being genetically very closely related, the marble trout Salmo marmoratus and the brown trout Salmo trutta exhibit marked phenotypic differences, particularly with regard to skin pigmentation. Histological analysis of skin from the head and gill cover of differently aged individuals of the two species was carried out in order to characterize differences in skin structure. The basic structure of skin of the individuals studied corresponded with that described for other salmonids, though the head epidermis was somewhat thicker in S. marmoratus than in S. trutta, thickening with age in both species. Numerous secretory goblet cells and sporadic secretory sacciform cells were observed in the upper and middle part of the epidermis in both species. Melanophores were present in both species only in the dermis, and were bigger in S. marmoratus and present at lower average density than in S. trutta, and more or less constant across all age classes. In adult S. marmoratus with fully established marble pigmentation, light areas at low density with small (i.e. aggregated) melanophores were present, while in S. trutta melanophores were more uniformly distributed.
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Keywords

melanophore; epidermis; dermis; colour pattern; pigmentation

About this article
Title

Morphological differences in the skin of marble trout Salmo marmoratus and of brown trout Salmo trutta

Journal

Folia Histochemica et Cytobiologica

Issue

Vol 50, No 2 (2012)

Pages

255-262

Published online

2012-07-04

DOI

10.5603/FHC.2012.0034

Bibliographic record

Folia Histochem Cytobiol 2012;50(2):255-262.

Keywords

melanophore
epidermis
dermis
colour pattern
pigmentation

Authors

Urška Sivka
Karel Halačka
Simona Sušnik Bajec

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