Etude sur le cycle reproducteur de la truite arc-en-ciel et de la tanche. Effet de variations expérimentales de la température
1975
Breton, Bernard | Jalabert, Bernard
In the rainbow trout (Salmo gairdneri) and the tench (Tinca tinca) at the time of spermatogonia divisions a rise in the plasma gonadotropin levels was observed. Just before or during the spawning period, E2 17β and plasma gonadotropin reach their maximum levels. (2) When the effects of raising the natural cycle temp of the tench were studied (Δt +3°C and +6°C), in conditions where nycthemeral and seasonal rhythmicity were maintained, a significant increase in fertility was observed with the increase in temp (the 1st spawning period was earlier and there was a rise in the number of spawnings). This effect of temp seems to act at the level of the hypothalamo-pituitary system.
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