Abstract
The double immunofluorescent method indicates that two types of gonadotropes occur in the proximal pars distalis of the teleost fish Rutilus rutilus. With rabbit anti-carp GTH as the first antibody the two cell types cross-react whereas after rabbit anti-salmon GTH as the first antibody only the so-called globular cell, known to produce gonadotropin in teleosts, cross-reacts. The cytological differences between the two assumed gonadotropic cells are reviewed. The pseudoisocyanine technique gave a selective fluorescent picture of the assumed gonadotropes. Fine structural analysis shows that the gonadotropic cells close to the neurohypophysis are innervated by one type of fiber in contrast to most of the gonadotropic cells, which are not innervated. In the latter case the neuroendocrine information reaches the gonadotropic cells by a median eminence system in which the intervascular channels in the proximal pars distalis are the last parts.
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