Triploidy in rainbow trout

摘要

An analysis of the chromosomes of the rainbow trout, Salmo gairdneri, revealed one triploid individual among 18 specimens examined. The diploid specimens possessed 60 chromosomes, whereas the single triploid possessed approximately 90. Suppression of the second meiotic division followed by fertilization of the unreduced oocyte is the most likely mechanism by which triploidy was achieved in this fish.