Control of reproduction in northern pike
Résumé
Several methods to control gamete availability in northern pike were investigated. Precocious induction of ovulation was achieved with a single injection of partially purified salmon gonadotropin, but the treatment should be administered soon after capture in order to avoid ovarian atresia. Ovulated oocytes should be inseminated within 24 hours after ovulation. Loss of fertility due to aging occurred 1-3 days after ovulation. High doses of progesterone induced a threefold increase of sperm release. Cryopreservation of diluted sperm at -196 C led to variable fertilizing capacities after thawing, depending on the donor male. A diluent originally tested for trout was used successfully for artificial insemination.
Domaines
Sciences du Vivant [q-bio]
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