•  
  •  
 

Document Type

Research

Abstract

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.

Publication Date

1965

Journal Title

Proceedings of the Iowa Academy of Science

Volume

72

Issue

1

First Page

506

Last Page

517

Copyright

© Copyright 1965 by the Iowa Academy of Science, Inc.

Language

EN

File Format

application/pdf

Share

COinS