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The aim of the study was to determine the effects of photoperiod regimes under natural temperature conditions on reproductive performances (gametogenesis, spawning quality) in Eurasian perch Perca fluviatilis. During a 10-month experiment, fish were reared in 12 tanks (3000 L, 88 fish/tank, initial mean weight of 300 g, age of 2 + ) in an outdoor water-recirculating system and subjected to...
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