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水產研究(1993年創刊)

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  • 日期: 2019-10-15
水產研究(1993年創刊)-超雄性 (YY) 尼羅吳郭魚之選育及單雄性魚苗量產的應用
主題: 超雄性 (YY) 尼羅吳郭魚之選育及單雄性魚苗量產的應用
摘要(中):
本試驗主要目的是以尼羅吳郭魚生產基因型YY的超雄性魚,再用YY超雄性魚與正常雌性魚交配大量生產全雄性魚苗供商業化養殖。以含雌性激素 (17α-ethynylestradiol, 17α-EE) 100 mg/kg 的飼料連續餵食正常XY雄性魚及YY超雄性魚60天,分別得到93.9%具有雌性功能的變性雌魚(XY△♀) 以及46.88% 超雄性變性雌魚 (YY△♀),顯示正常雄性魚變性較超雄性魚容易。子代測試結果顯示變性雌魚與正常雄魚交配的子代中有25% 的YY超雄性魚、YY變性雌魚與正常雄魚交配結果,子代XY及YY雄魚各佔一半。同時YY變性雌魚與YY超雄性魚交配子代均為YY超雄性魚,顯示尼羅吳郭魚性染色體為XX-XY型。各階段子代測試過程,與YY超雄性魚交配所得到的子代並未完全達到100% 雄性,顯示性別並非完全由單基因因子決定,而且顯示與交配親魚個體有關,因此推斷性別是由性染色體基因、體基因及環境 (如溫度) 等複雜的因子共同決定。本次試驗YY超雄性魚與正常雌魚 (XX) 交配,結果顯示魚苗的雄性比例達到97.08%。因此本研究結果可以運用在商業化全雄性尼羅吳郭魚苗的量產,提供吳郭魚單雄性養殖。
出版日期: 2013/12/31
標題title(英): Selection of YY Supermale Nile Tilapia, Oreochromis niloticus and Its Application to Commercial Production of All-Male Progenies
作者: 陳榮華‧蔡添財‧劉富光
卷別: 21
期別: 2
頁碼: 69-82
作者 auther(英): Rong-Hwa Chen, Tian-Tsair Tsay and Fu-Guang Liu
摘要abstract(英): The aim of this study is to develop YY supermale production of Nile Tilapia (Oreochromis niloticus) and mass production of all-male offspring on a commercial scale by crossing YY supermales with normal females. In this study, normal male genotype (XY) and supermales (YY) were treated with a dosage of 100 mg per kg food of 17α-EE for a duration of 60 days; 93.6% sex reversal females (XY△♀) and 46.88% sex reversed superfemales (YY△♀) were obtained, respectively. This result demonstrated that the normal males were far easier than supermales in sexual reversal. The progeny testing procedure results of the cross between neofemales and normal males presented 25% supermales; if YY sex reversed females mated with normal males, it resulted in half XY males and half YY males. Furthermore, when the YY sex reversed females crossed with the YY supermales, we found that all supermales presented in progeny. All of these results indicated that the Nile tilapia female has homogamety genotype XX, while the male is heterogamety XY. The progeny testing demonstrated that all crosses between YY supermales to XX females, sex reversed supermales to normal males, and sex reversed YY females to YY supermales do not result in 100% male offspring. This indicated that sex determination in Nile tilapia is not only based on the monofactorial gene but on other factors as well, including the autosomal gene and environmental factors, particularly temperature. These genetic and environmental factors combine in a rather complex way to influence the sex determination of Nile tilapia. Finally, this study found that the YY supermales give a high percentage of male offspring with 97.08%, which is crossed to normal female (XX) Nile tilapia; this result was higher than in any other previous report. Therefore, mass production of YY male broodstock and application in all male Nile tilapia culture on a commercial scale is possible.
使用語言: 中文
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