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Citation

Migaud H, Mandiki R, Gardeur J, Kestemont P, Bromage NR & Fontaine P (2003) Influence of photoperiod regimes on the Eurasian perch gonadogenesis and spawning. Fish Physiology and Biochemistry, 28 (1-4), pp. 395-397. https://doi.org/10.1023/B%3AFISH.0000030604.04618.d7

Abstract
The effects of photoperiod regimes under ambient temperature on gonadal growth and spawning were investigated in Eurasian perch, Perca fluviatilis. This study showed that continuous lighting inhibited reproduction in male and female fish with very low sex steroid levels being measured. Constant LD 16:8 resulted in heterogeneous gonad development and sex steroid levels compared to natural regime, with only 54% of females and 30% of males maturing. Seasonal variations in daylength also seem to be required to control reproduction.

Journal
Fish Physiology and Biochemistry: Volume 28, Issue 1-4