Abstract
The cytological changes of the eta (“prolactin”) cells in the pituitary of Tilapia mossambica due to changes in environmental salinity have been described at both the light- and electron-microscope levels. In fish maintained in fresh water, the eta cells in the well-developed rostral lobe are large and contain many large secretory granules. A prominent Golgi system in addition to a multilayered endoplasmic reticulum suggests a high level of secretory activity. On the other hand the rostral lobe is smaller in seawater fish and the eta cells appear condensed, the organelles as well as granule size are reduced suggesting a diminished synthetic activity. The possible role of the secretion of eta cells in the osmoregulation of fishes is discussed.
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