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Fish farming research. Researcher handling blood samples during tests on a batch of trout to study their sexual maturation and the effect of sex hormones. The trout are weighed, measured, and sampled for blood while anaesthetised. The individual trout are identified with an RFID (radio-frequency identification) chip. This project is part of the PEIMA experimental fish farm (Pisciculture Experimentale INRA des Monts d'Arree) in Sizun, Finistere, Brittany, in north-western France. INRA is the French national agronomy research institute. Photographed in 2011.
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