Mottled sculpins require water quality very similar to trout... Temperature must remain cool and DO high. They are more of a stream species, but can be found in colder lakes. Not sure they'd survive in a pond. They are predators in their own right. Very large mouths for their body size. I have kept them in aquariums in the past and it is amazing what they can swallow.

GSH are probably found in the lakes in your area where other non native game fish have been stocked. Remember, there are no bass, sunfish or any of the other warm water species we commonly stock in our ponds native to the Pacific Northwest. Most of the minnows/cyprinids native to the Pacific Northwest are predators themselves, such as the squawfish/pikeminnows... Where bass or sunfish have been stocked, there is a good chance GSH were brought in and stocked as well.