Environmental sex determination:: the effect of temperature and salinity on sex ratio in Oreochromis niloticus L.
Environmental sex determination:: the effect of temperature and salinity on sex ratio in Oreochromis niloticus L.
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DOI：
10.1016/s0044-8486(98)00489-x
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发表时间：
1999-03-30
期刊：
影响因子：
4.5
通讯作者：
Beardmore, JA
中科院分区：
文献类型：
--
作者：
Abucay, JS;Mair, GC;Beardmore, JA
本文报道了尼罗罗非鱼（Oreochromis niloticus）性别分化期环境条件对其性别比例的影响。不同性别基因型在首次喂食后至少21天暴露于不同温度（假定全雌、全雄和全yy雄性）和盐度（仅假定全雌后代）中，并在性腺挤压进行性别鉴定前进行生长。大多数假定的全雌后代暴露在高温（36.54 +/- 0.39℃）下产生的雄性百分比明显高于环境温度（27.87 +/- 1.40℃）下饲养的对照组。同样，在高温条件下，部分全雄性和YY雄性后代的雄性比例显著低于对照组。YY型男性的性别分化似乎比正常XY型男性更不稳定，尽管这可能归因于不同程度的近亲繁殖。低温（25.78 +/- 0.24℃）和不同盐度（11.30 ~ 26.65 ppt）对性别比例没有显著影响。性别分化对某些环境因素的明显敏感性是在单因素遗传性别决定机制的背景下考虑的。讨论了对性控制技术的影响。(C) 1999 Elsevier Science B.V.版权所有
This paper reports the effects of environmental conditions during the period of sex differentiation on the sex ratio of the Nile tilapia (Oreochromis niloticus). Different sex genotypes were exposed to varying temperatures (putative all-female, all-male and all-YY males) and salinities (putative all-female progeny only) for a minimum period of 21 days after first feeding and were on grown prior to sexing by gonad squash. The majority of the putative all-female progeny exposed to high temperature (36.54 +/- 0.39 degrees C) produced significantly higher percentages of males compared to controls reared at ambient temperature (27.87 +/- 1.40 degrees C). Similarly, at high temperature, some of the all-male and YY male progenies had significantly lower percentage of males compared to controls. Sex differentiation in YY males appears to be more labile than in normal XY males although this could possibly be attributable to different levels of inbreeding. Low temperature (25.78 +/- 0.24 degrees C) and varying levels of salinity (11.30 to 26.65 ppt) did not significantly affect sex ratios. The apparent sensitivity of sex differentiation to some environmental factors is considered in the context of a predominantly monofactorial genetic sex determining mechanism. Implications for sex control technologies are discussed. (C) 1999 Elsevier Science B.V. All rights reserved.