Cytological reactions of the pars intermedia of the pituitary gland of the fish, Boops salpa L (teleostean fish, Sparidae) to variations in background color and to illumination

Malo-Michele, M.

General and Comparative Endocrinology 31(3): 343-349


ISSN/ISBN: 0016-6480
PMID: 67063
DOI: 10.1016/0016-6480(77)90098-3
Accession: 068519163

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As in many other teleost fishes, the pars intermedia of B. salpa contains 2 distinct secretory cell types, 1 staining with MacConaill's hematoxylin (PbH) and the other with periodic acid-Schiff (PAS). The histological study of the metaadenohypophysis was carried out after adaptation (40 days) of the fish either under the natural photoperiod on natural black-green or artificial black background or under permanent illumination on an artificial black or white background. Black background adaptation stimulates both cell types and when combined with permanent illumination, it induces a strong hyperplasia and hypertrophy of the PAS positive cells which regress on a white background. Permanent illumination activates both cell types. Their respective functions in the control of pigmentation are discussed.