Endocrine Organs of a Parasitic Male Deep-Sea Angler-Fish,Edriolychnus schmidti

The parasitic male deep-sea angler-fish Edriolychnus schmidti Regan 1925, which was described by Regan and Trewavas 1932, was reinvestigated with respect to the endocrine organs. Although the original microscopical sections are not in a good condition, it could be concluded that those organs which are involved in regulation of various internal environmental factors, as well as those involved in adaption to external factors, appear poorly developed or reduced. Mechanisms regulating reproductive activities seem to be well developed; a pronounced tuberis region is seen in the otherwise reduced brain and the peculiar pituitary gland appears to contain secretory active cells.