Abstract
The sex steroid profile of Caspian brown trout was investigated after gonadotropin-releasing hormone analogue (GnRHa) injection throughout the spawning season, i.e. December and January. The values of testosterone (T), 11-Ketotestosterone (11-KT), progesterone (P), cortisol (C) and 17α, hydroxyprogesterone (OHP) were measured for GnRHa treated (the treatment group) and untreated groups (the control group) during the spawning season. In treated males, the values of 11-KT, OHP and C increased 14 days after GnRHa treatment and only showed a significant decrease at the end of the season. Also, the T and P levels showed increases 14 days after GnRHa treatment and then decreased continuously towards the end of the season. In untreated males, sex steroid peaks were observed 27 days after first stripping. In conclusion, our results showed that the GnRHa treatment of Caspian brown trout promotes the final maturation by clear effects on the sex steroid profile.
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