Morphological differences in the skin of marble trout <i>Salmo marmoratus</i> and of brown trout <i>Salmo trutta</i>
Despite being genetically very closely related, the marble trout <em>Salmo marmoratus</em> and the brown trout <em>Salmo trutta</em> 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 specie