When you say cold water fish, most folks would think trout. I guess cool water fish might be more appropriate. I've caught pike in mid-July in Northern Ontario when the surface temperature of the lake and down to 8-10 feet was in the mid-70s. They've been stocked in lakes that are well south of their normal range. I have friends in Europe that stalk them in salt water marshes. Does that make them a salt water fish? It is what it is.