Japanese fish sex

Hypoxia caused by eutrophication is amongst the most pressing global problems in aquatic systems. Notably, more than "dead zones" have been identified worldwide, resulting in large scale collapse of fisheries and major changes in the structure and trophodynamics. Recent studies further discovered that hypoxia can also disrupt sex hormone metabolism and alter the sexual differentiation of fish, resulting in male biased F1 generations and therefore posing a threat to the sustainability of natural populations. Using the Japanese medaka Oryzias latipes as a model, we demonstrate, for the first time, that hypoxia can turn genotypic female fish with XX chromosomes into phenotypic males.
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Filming fish that change sex

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Medaka: the fish that helps us understand gender | The Japan Times

Thank you for visiting nature. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser or turn off compatibility mode in Internet Explorer. In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript. THE life history of the eel is complex and despite many investigations little is known about its embryonic development. Some investigators such as Grassi and Calandriccio cited in ref.
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Why do some fish change sex?

To enjoy our content, please include The Japan Times on your ad-blocker's list of approved sites. The diminutive medaka Japanese rice fish have been kept as pets since the Edo Period They are hardy animals, an important quality for a pet, and they naturally occur in a variety of colors, including gold. These characteristics made them popular among all classes of feudal Japanese in the past.
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The discovery of this molecular mechanism is expected to advance the development of new sex control technologies. On the other hand, the sex-determination of fish, amphibians, and reptiles is greatly affected by ambient temperature. The sex-determining gene, DMY, was recently identified on their Y chromosome. In other words, their genetic sex-determination is affected by temperature. Previous research from Kumamoto University demonstrated that cortisol, a high-temperature-induced stress hormone, directly acts on the gonads and causes masculinization of XX medaka Hayashi et al.
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