[Home ] [Archive]    
:: Main :: About :: Current Issue :: Archive :: Search :: Submit ::
:: Volume 10, Issue 2 (4-2011) ::
IJFS 2011, 10 Back to browse issues page
Hormonal sex reversal of rainbow trout (Oncorhynchus mykiss) by ethynylestradiol-17α (EE2)
K. Razmi * , T. Naji , M. Alizadeh , H. Hoseinzadeh Sahafi
, k.razmi@hotmail.com
Abstract:   (12139 Views)
Rainbow trout (Oncorhynchus mykiss) females grow larger and mature later than males, making all-female stocks economically advantageous. The objective of this research was to develop methods for the production of monosex populations of trout through the use of sex steroids. The synthetic estrogen ethynylestradiol-17α (EE2) was administered in single period-immersion treatment of 400 µg/l for 1, 2, 4 and 8 h to groups of newly-hatched sac fries of rainbow trout and in a 30 day dietary treatment of 5, 10, 15 and 20 mg/kgf of newly swum up fries. 73.4 And 94.5% females were obtained with 1 and 2-h single-immersion of EE2 respectively (38% female in control). However, higher doses progressively reduced the survival drastically. Sex ratios of dietary treatment of fry were 60, 57.4, 78 and 94% females respectively. Treatments also resulted in a slight increase of both weight and length. This increase was related to the method of hormonal exposure (dietary 12 >">  immersion), but not dosage-dependent for utilized hormone. This demonstrates that the direct feminization of rainbow trout can be achieved and resulted in  sex reversal ratio effectively but not decreased the growth, as observed in hormonal sex reversed females, and it would be a noticeable approach to the direct feminization of trout.
Keywords: Ethynylestradiol-17α, Rainbow trout, Immersion, Dietary
Full-Text [PDF 543 kb]   (4603 Downloads)    
Type of Study: Orginal research papers | Subject: aquaculture
Received: 2011/05/31 | Accepted: 2015/09/13 | Published: 2015/09/13
Send email to the article author

Add your comments about this article
Your username or Email:

CAPTCHA code


XML     Print


Download citation:
BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks
Send citation to:

Razmi K, Naji T, Alizadeh M, Hoseinzadeh Sahafi H. Hormonal sex reversal of rainbow trout (Oncorhynchus mykiss) by ethynylestradiol-17α (EE2). IJFS. 2011; 10 (2) :304-315
URL: http://jifro.ir/article-1-178-en.html


Volume 10, Issue 2 (4-2011) Back to browse issues page
مجله علوم شیلاتی ایران Iranian Journal of Fisheries Sciences
Persian site map - English site map - Created in 0.06 seconds with 31 queries by YEKTAWEB 3755