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To improve your experience, we use cookies to store certain browsing information and provide secure navigation, and to collect statistics with a view to improve the site’s features. For a complete list of the cookies we use, download “Ghostery”, a free plug-in for browsers which can detect, and, in some cases, block cookies.

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These cookies are used by advertising agencies such as Google and by social media sites such as LinkedIn and Facebook. Among other things, they allow pages to be shared on social media, the posting of comments, and the publication (on our site or elsewhere) of ads that reflect your centres of interest.

Our EZPublish content management system (CMS) uses CAS and PHP session cookies and the New Relic cookie for monitoring purposes (IP, response times).

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For more information about the cookies we use, contact INRA’s Data Protection Officer by email at or by post at:

24, chemin de Borde Rouge –Auzeville – CS52627
31326 Castanet Tolosan CEDEX - France

Dernière mise à jour : Mai 2018

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Why is fish reproduction research necessary?

An understanding of the fundamental processes determining fish reproduction is essential in order to understand species-specific reproduction strategies and triggers; to control sex ratios, puberty...
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Which are the main fish species studied?

The primary species are goldfish, carp and rainbow trout. However, research has also been carried out on salmon, catfish, sea bass, sea bream, eel and tilapia. Other species such as cod, flatfish,...
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What environmental factors control fish reproductive cycles in nature?

Fish exhibit both seasonal (daylength influenced) and daily (light/dark cycle influenced) endogenous rhythms. If they are maintained in constant environmental conditions of temperature and...
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What is broodstock?

In aquaculture, this is a group of sexually mature male and female individuals, kept separate for breeding purposes. The advantage of maintaining a broodstock is that eggs and fry can be produced in...
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What defines puberty and why is timing of puberty important in fish farming?

Puberty is the development period covering the transition from an immature juvenile to a mature adult reproductive system. The initiation of puberty in males is marked by the onset of sperm...
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How is sex determined in fish?

In numerous species of fish, sex is determined principally genetically. For most fish species, the differentiation of the gonad into a testis or an ovary can be strongly influenced by hormonal,...
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How is fish sex controlled in fish farming?

Fish sex may be manipulated by the direct application of hormones. However, direct hormonal methods are not permitted in many countries, indeed within the European Union only the use of certain...
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