It was the purpose of this study to describe the secondary sex characters and the histological appearance of the gonads, including the associated duct system, of the fish Lebistes reticulatus from birth through differentiation and maturation when subjected to the hormone estradiol. Sixty-four Lebistes reticulatus were fed 0.125 mg of estradiol, beginning at birth, at intervals of 60 hours. An equal number of fish were used as the control. Fish were sacrificed at ten-day intervals following birth, for a period of 80 days, and examined for the presence of secondary sex characters. Serial cross sections of the gonads were prepared from 32 experimental fish and 16 control fish. Estradiol hormone, when fed to male Lebistes reticulatus suppressed the appearance of male secondary sex characters, but did not stimulate the appearance of female sex characters. Estradiol had no apparent effect on the secondary sex characters or gonads of females. The effects produced by estradiol feeding on the testes were: a stunted testicular size, a suppression of spermatogenesis, an accumulation of connective tissue stroma within the medulla of the organ, a suppression of secretory activity of cells lining the sperm ducts.
Proceedings of the Iowa Academy of Science
©1965 Iowa Academy of Science, Inc.
Story, Michael Thomas
"Effects of Estradiol Hormone on the Maturation of the Gonads and Associated Duct System of the Fish Lebistes reticulatus,"
Proceedings of the Iowa Academy of Science, 72(1), 506-517.
Available at: https://scholarworks.uni.edu/pias/vol72/iss1/72