Induction of feminization in largemouth bass ( Micropterus salmoides ) by oral administration of estradiol-17 beta or diethylstilbestrol and associated pathological effects

Year:
2001
Journal:
Journal of Aquaculture in the Tropics
Volume:
16/2
Pages:
185-195
Author:
Al-Ablani, ;Phelps, Ronald P.
Category:
Pub ID:
2480
Abstract:
The effects of dietary estradiol-17 beta (E sub(2)) and diethylstilbestrol (DES) on the induction of gonadal feminization in 40-day old largemouth bass (LMB), Micropterus salmoides (Centrarchidae) were investigated. LMB fry were fed either E sub(2) or DES of 100, 200, or 400 mg/kg feed for a period of 40 days. All concentrations of both estrogens produced 100% feminization. However, 26 to 40% of females in each dose level of both estrogens possessed significantly thin ovaries. Histological examination indicated the absence of intersex fish among all treatments. DES treatment exhibited toxic effects manifested in deformity of less than 11% of ovaries in each dose level. However, survival rates among all treatments were not significantly different (p > 0.05). Mean final weight of fry fed control diet was higher than E sub(2) and DES fed fry, respectively (p < 0.01) suggesting that neither estrogens had any anabolic effect

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FAA40360-A02A-7585-4CAEA7FD5ABD5C86.pdf

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