Annual cycles of steroid hormone production, gonad development, and reproductive behavior in the Atlantic stingray.

@article{Tricas2000AnnualCO,
  title={Annual cycles of steroid hormone production, gonad development, and reproductive behavior in the Atlantic stingray.},
  author={Timothy C. Tricas and Karen P. Maruska and L. E. L. Rasmussen},
  journal={General and comparative endocrinology},
  year={2000},
  volume={118 2},
  pages={
          209-25
        }
}
The mating season of the Atlantic stingray (Dasyatis sabina), which begins in August and continues through April, is the longest documented for any elasmobranch fish. Despite this protracted mating period, female stingrays ovulate synchronously at the end of the mating season and there is no evidence for sperm storage by females. Thus, the proximate causal factors and ultimate function of this extended preovulatory mating are unknown. Annual cycles of the gonadal steroids testosterone (T… 
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The Atlantic stingray, Dasyatis sabina, has a well-defined annual reproductive cycle in Florida and reproductive parameters and serum levels of five steroid hormones, 17beta-estradiol (E2), progesterone (P4), testosterone (T), dihydrotestosterone (DHT), and corticosterone (CS), which increased progressively through winter and spring.
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