Grandpa -
Don't have the Alaskan troll quota handy - too many numbers floating around the limited space of my brain.

In my experience all chinook have a distinctive odor. Virtually all fish have an odor of their own - largemouth bass smell different than smallmouth and both are different than trout.

The reason blackmouth tend to be small is two fold. Generally the feeding conditions in the Sound is less than that in the ocean thus at a given age the resident fish will be smaller than the ocean fish.

The second reason is the more important - we catch then as immature fish - less than fully grown. For some reason harvesting the fish at 22" or 24" or 26" reduces the likelyhood of the fish reaching 30 inches.

Tight lines
Smalma