They live in frigid seas, forming schools and sharing food among themselves. When the time comes, they return to the river they were born in.
Its ecology is starkly different from that of other Basculin, so theories that it's a totally different species have gained traction in recent years.
Though it differs from other Basculin in several respects, including demeanor—this one is gentle—I have categorized it as a regional form given the vast array of shared qualities.