Influence of photoperiod regimes on the Eurasian perch gonadogenesis and spawning
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.
KeywordsSteroid Ambient Temperature Seasonal Variation Continuous Lighting Gonad Development
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- Bromage, N., Porter, M. and Randall, C. 2001. The environmental regulation of maturation in farmed finfish with special reference to the role of photoperiod and melatonin. Aquaculture 197: 63–98.Google Scholar
- Fostier, A. and Jalabert, B. 1986. Steroidogenesis in rainbow trout (Salmo gairdneri) at various pre-ovulatory stages: Changes in plasma hormone levels and in vivo and in vitro responses of the ovary to salmon gonadotropin. Fish Physiol. Biochem. 2: 87–89.Google Scholar
- Migaud, H., Fontaine, P., Sulistyo, I., Kestemont, P. and Gardeur, J.N. 2002. Induction of out-of-season spawning in Eurasian perch Perca fluviatilis: Effects of cooling and chilling periods on female gametogenesis and spawning. Aquaculture 205: 253–267.Google Scholar