Just a comment, not necessarily related to the fish in question. Curt Kraemer feels that steelhead/sea-run cutthroat hybrids occur with some regularity in the Stillaguamish system. Among the big "cutthroat" identified by anglers there seems to be a break at about twenty inches and then a small number of fish from about twenty-four to twenty-six inches which he feels are hybrids. These larger fish apparently exhibit at least some cutthroat characteristics such as hyoid (basibranchial) teeth, though sometimes not very prominently. Normally coastal cutthroat are less likely to hybridize with rainbows than other cutthroat subspecies are, but an ongoing study at Forks Creek on the lower Willapa indicates that it probably occurs more often than has been previously thought.