In:
Applied Mechanics and Materials, Trans Tech Publications, Ltd., Vol. 142 ( 2011-11), p. 238-242
Abstract:
The aim of this study was to investigate the effects of exogenous melatonin on sex reversal in the rice eel (Monopterus albus). This was carried out by evaluating the estradiol (E2) and testosterone (T) concentrations, gonadosomatic index (GSI) and sex ratio. Fish (9.80 ± 1.20 g average initial weight; n = 3 per group) were fed with one of five practical diets containing 0 (control), 10, 30, 50 or 70 mg kg-1 dietary melatonin contents to apparent satiation for fifteen months. Serum E2 and T concentrations were determined by radio immunoassays. E2 and T concentrations, GSIs and survival rates significantly decreased with increased concentrations of exogenous melatonin. Fish fed 70 mg kg-1 of dietary melatonin showed significantly lower rates of E2, T, GSIs and survival ratio than those fed with lower melatonin concentrations or the control group. The shift of sex ratio towards more male and intersex fish was correlated with increasing dietary melatonin contents. Therefore, a high dosage of melatonin may inhibit gonadal development and promote sex change from female to male in M. albus.
Type of Medium:
Online Resource
ISSN:
1662-7482
DOI:
10.4028/www.scientific.net/AMM.142
DOI:
10.4028/www.scientific.net/AMM.142.238
Language:
Unknown
Publisher:
Trans Tech Publications, Ltd.
Publication Date:
2011
detail.hit.zdb_id:
2251882-4
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