The effects of the pyrethroid insecticide, bifenthrin, on steroid hormone levels and gonadal development of steelhead ( Oncorhynchus mykiss ) under hypersaline conditions

Highlights • Male testicular tissue and sex steroid levels largely unaffected by bifenthrin exposure. • Ovaries of juvenile female steelhead advance with increasing salinity. • Although GSI was not altered in females, widespread atresia of the ovary was observed after bifenthrin exposure. • Bifenthr...

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Veröffentlicht in:	General and comparative endocrinology 2013-06, Vol.186, p.101-107
Hauptverfasser:	Forsgren, Kristy L, Riar, Navneet, Schlenk, Daniel
Format:	Artikel
Sprache:	eng
Schlagworte:	acclimation Animals Aquatic toxicology bifenthrin breeding ecosystems Endocrinology & Metabolism Estradiol - metabolism estuaries Female fish freshwater gonadosomatic index Insecticide Insecticides - toxicity Male Oncorhynchus mykiss Oncorhynchus mykiss - metabolism ovarian follicles Ovary - drug effects Ovary - metabolism pyrethrins Pyrethrins - toxicity Reproduction risk assessment saline water Salmon Sex steroids steroid hormones surface water Water Pollutants, Chemical - toxicity wildlife
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Zusammenfassung:	Highlights • Male testicular tissue and sex steroid levels largely unaffected by bifenthrin exposure. • Ovaries of juvenile female steelhead advance with increasing salinity. • Although GSI was not altered in females, widespread atresia of the ovary was observed after bifenthrin exposure. • Bifenthrin increase estradiol-17β levels in freshwater in female fish. • Under hypersaline conditions plasma estradiol-17β and testosterone were significantly reduced in female fish.
ISSN:	0016-6480 1095-6840
DOI:	10.1016/j.ygcen.2013.02.047