Changes in Sex Steroids, Growth Hormone, and Insulin‐Like Growth Factor‐I during Ovarian Development in Rainbow Trout Cultured in a Water Recirculating System with Continuous Light

Female Rainbow Trout Oncorhynchus mykiss were cultured within a freshwater recirculating aquaculture system under 24‐h constant lighting in 13°C water and fed every 6 h to near satiation. An opaque roof allowed surface light intensity to vary between <200 and about 1,500 lx. During months 14–26 posthatch we examined changes in plasma concentrations of testosterone (T), estradiol‐17β (E2), the maturation inducing steroid (MIS)...