The effect of prolactin on water influx in isolated gills of the goldfish, Carassius auratus L.

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Abstract 1. 1. The effect of prolactin on water influx into the isolated gills of the goldfish, Carassius auratus, was studied by an in vitro technique. The weight increase of isolated gills of intact, hypophysectomized, prolactin-injected and growth-hormone injected goldfish in deionized water after preincubation in saline solution was measured. 2. 2. Bovine prolactin injection and prolactin given into the preincubation saline medium significantly reduced the weight increase of the isolated gills. On the other hand, growth hormone showed no effect. 3. 3. Hypophysectomized fish showed almost the same range of weight increase of the isolated gills as intact fish, but prolactin injection of hypophysectomized goldfish significantly reduced the weight increase. 4. 4. Prolactin administered either by a peritoneal injection or by addition into a preincubation medium may inhibit the water influx into the gills of goldfish.

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