I'm not saying you're wrong, just wondering if you misidentified the species. Blues and channels resemble each other closely and the channel has different colors it can exhibit depending on the season (tan, olive, blue, dark - almost black). Many people mistake that they catch blue cats in the Red River where they don't exist. What were the key identifying characteristics that make you think it was a blue cat?
Here's a link with key identifiers for each species:
https://www.hookedoncatfish.com/blue-catfish-vs-channel-catfish/
Game and Fish doesn't list blue catfish on their list of fish species in ND