After a little looking around :) interesting rabbinical traditions on the two genders, which depict Jonah being transferred from fish to fish, of mixed genders. E.g.: "...A female fish quick with young approached the male fish in which Jonah was, threatening to devour both unless Jonah were transferred to her, and announcing her divine orders to that effect. Leviathan confirmed her story at the request of both fishes, and then Jonah was ejected from one fish into the over-filled belly of the other...." — Davïd 12 hours ago