Artificial hybrids between Amur pike (Esox reicherti) and North American esocids

Artificial hybrids between Esox reicherti, the only species in the family Esocidae that does not occur naturally in North America, and North American esocids were developed. Five of a possible 10 crosses are described in detail. Three crosses failed (those involving the males of E. niger and E. americanus) for reasons other than methodology, the cross involving females of E. americanus americanus was not made, and a fifth cross involving the male of E. masquinongy was successful but no data are included. Interspecies fertility was suprisingly high, and an inverse relationship existed between survival of crosses and the difference in potential maximum size of parent species. At least one cross was fertile, and an F2 generation and backcrosses were developed