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Previous studies have demonstrated that ovulatory female goldfish release a variety of sex steroids into the water where they function as a pheromonal blend dominated by C21 steroids that stimulates male hormone release, sperm production and behavior. This study investigated whether male goldfish might also release sex steroids with pheromonal activity. It(More)
This study investigates the noradrenergic and/or dopaminergic receptors subtypes involved in the anoretic action of CRF in goldfish. Agonists and antagonists of alpha1- and alpha2-adrenoceptors, and D1- and D2-dopaminergic receptors were intracerebroventricularly (i.c.v.) administered alone or in combination with CRF in the case of antagonists. Food intake(More)
The present study evaluated the effects of both intraperitoneal (i.p. ) and intracerebroventricular administration of selective Y(1) [(Leu(31), Pro(34))-NPY] and Y(2) [(Pro(13), Tyr(36))-NPY (13-36)] receptor agonists on food intake in satiated goldfish. Food intake (FI) was significantly increased by central administration of the Y(1) agonist (1 microg),(More)
Feeding regulation by monoamines, neuropeptides and certain hormones has been studied in fish, but a possible role of melatonin is unknown. The purpose of the present study was to investigate the effects of melatonin on food intake in goldfish. Fishes were housed in 12L:12D and injected with different doses of either melatonin or 2-iodomelatonin. Two routes(More)
The possible action of 5-HT on feeding behavior in goldfish has been studied. Food intake was significantly reduced by intracerebroventricular (ICV) injection of serotonin (5-HT, 10 microg) at 2 h postinjection. After peripheral (intraperitoneal) administration of 5-HT (1 and 10 microg/g bw), no significant modifications in food intake were detected. Thus,(More)
The effect of a daily injection of the delta-selective opioid antagonist naltrindole (1 mg/kg), from birth to postnatal day 19, on basal and post-stress corticosterone levels in 25-day old rats of both sexes was investigated. The effects of manipulation were studied by including two control groups, one group received daily injections of saline and a second(More)
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