Environmental Biology of Fishes

, Volume 88, Issue 1, pp 1–7 | Cite as

Plasma steroid concentrations of adult male Atlantic sharpnose sharks, Rhizoprionodon terraenovae, in the northern Gulf of Mexico, with notes on potential long term shifts in reproductive timing

  • Eric R. Hoffmayer
  • James A. Sulikowski
  • Jill M. Hendon
  • Glenn R. Parsons
Article

Abstract

In previous literature it was proposed that Atlantic sharpnose sharks, Rhizoprionodon terraenovae, from the western Atlantic Ocean (WAO) population exhibited differences in their reproductive timing when compared to the northern Gulf of Mexico (GOM) population. The objective of the current study was to examine the reproductive cycle of mature male sharpnose sharks from the northern GOM population. Plasma testosterone (T) and estradiol (E2) were measured from 76 mature male sharpnose sharks sampled from 1999 to 2001, and the gonadosomatic index (GSI) was determined for 53 additional mature males sampled from 2007-2008. Plasma T, E2, and GSI exhibited similar cycles with peak values occurring in late spring (April/May) and lowest values occurring during the summer. These results suggest that male sharpnose sharks in the northern GOM are reproductively active one to two months earlier than previously reported, which now brings them into synchrony with the WAO population. Interestingly, this shift in reproductive timing corresponds with a 3.0°C (13.4%) increase in spring sea surface temperature (SST) from the Mississippi Sound over a 29 year period, which could translate into GOM male sharpnose sharks becoming reproductively active earlier in the year thus explaining the late spring peak in GSI.

Keywords

Atlantic sharpnose shark Testosterone Estradiol Gonadosomatic index Reproductive cycle 

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Eric R. Hoffmayer
    • 1
    • 2
  • James A. Sulikowski
    • 3
  • Jill M. Hendon
    • 2
  • Glenn R. Parsons
    • 1
  1. 1.Department of BiologyThe University of MississippiOxfordUSA
  2. 2.Center for Fisheries Research and Development, Gulf Coast Research LaboratoryThe University of Southern MississippiOcean SpringsUSA
  3. 3.Marine Science CenterUniversity of New EnglandBiddefordUSA

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