John Wiley & Sons, Ltd.

Application of EDSP Fish Short‐Term Reproduction Assay: Reproduction and Endocrine Function in Fathead Minnow (Pimephales promelas) and Killifish (Fundulus heteroclitus) Exposed to Bermuda Pond Sediment

0
A modified tier 1 EDSP 21‐day fish short‐term reproduction assay (FSTRA) was used to evaluate the effects of sediment exposure from freshwater and brackish ponds in Bermuda on reproductive fecundity and endocrine function in fathead minnow (pimephales promelas) and killifish (fundulus heteroclitus). Reproductively‐active male and female fish were exposed to control sediment and sediment from two freshwater ponds (fathead minnow) and two marine ponds (killifish) contaminated with polyarormatic hydrocarbons (PAH) and metals via flow‐through exposure for 21‐d. Reproductive fecundity was monitored daily. At termination, the status of the reproductive endocrine system was assessed by the gonad‐somatic index (GSI), gonadal histology, plasma steroids (estrogen [E2], testosterone [T], and 11‐ketotestosterone [11‐kt]), steroidogenic enzymes (aromatase and combined 3β/17 β ‐hydroxysteroid dehydrogenase [3/17‐hsd]), and plasma vitellogenin (vtg). Decreased reproductive fecundity, lower male body weight, and altered endocrinological measures of reproductive status were observed in both species. Higher plasma t levels in female minnows and 11‐kt levels in both male and female minnows and female killifish exposed to freshwater and brackish sediments, respectively. Decreased female e2 and vtg levels and gonadal cyp 19 (aromatase) activity were also found in sediment exposed females from both species. No effect on female 3/17‐hsd activity was found in either species. FSTRA provided a robust model capable of modification to evaluate reproductive effects of sediment exposure in fish. This article is protected by copyright. All rights reserved

Customer comments

No comments were found for Application of EDSP Fish Short‐Term Reproduction Assay: Reproduction and Endocrine Function in Fathead Minnow (Pimephales promelas) and Killifish (Fundulus heteroclitus) Exposed to Bermuda Pond Sediment. Be the first to comment!