Serum concentrations of reproductively-related circulating steroid hormones in the free-ranging lemon shark, Negaprion brevirostris

Lois E.L. Rasmussen, Samuel H. Gruber

Research output: Contribution to journalArticle

42 Scopus citations

Abstract

We have examined the concentrations of reproductively-related steroid hormones in 5 species of carcharhinid sharks, marine fishes possessing the unique attribute of placental viviparity. Measurements of serum estradiol, testosterone, progesterone, dihydrotestosterone, and corticosterone have provided baseline data for these hormones in both immature and adult male and female placental sharks. Our studies include: (1) changes in hormonal levels during maturation, (2) concentrations of circulating steroid hormones during peak breeding season, and (3) hormonal levels during gestation, including the collection of serial samples through and beyond birth from free-ranging lemon sharks. Our data suggest that steroids, important in regulating reproduction in higher mammals, are also essential in these cartilaginous fishes.

Original languageEnglish (US)
Pages (from-to)167-174
Number of pages8
JournalEnvironmental Biology of Fishes
Volume38
Issue number1-3
DOIs
StatePublished - Oct 1 1993

Keywords

  • Carcharhinids
  • Estradiol
  • Maturation
  • Progesterone
  • Reproduction
  • Testosterone

ASJC Scopus subject areas

  • Ecology
  • Aquatic Science

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