Of all of Maine’s fish species, sea-run brook trout are the least understood by fisheries biologists. That’s just one of the many mysteries surrounding these trout of lore and legend. However, even when afforded the opportunity to drop down to an estaurine habitat, not all brook trout do so. Sea-run trout are eastern brook trout that choose to spend at least a part of their lives in a marine environment. Shrouded in myth and mystery, sea-run, or anadromous brook trout have fascinated Maine anglers since time out of hand. A pair of anadromous brook trout, the 'holy grail' of trout fishing.