Up here in the north sound, the locals use the term "blackmouth" to refer to an immature (under 22") Chinook salmon. However, all Chinook can be identified by their dark mouth and black gum line. I understand many of the blackmouth in Puget Sound this time of year are the result of WDFW's delayed hatchery release program. Follow this link for more on that program: http://www.sschapterpsa.com/ramblings/PS_Blackmouth_history.htm As far as targeting blackmouth, I understand they have a tendency for the bottom of deeper (90'-120' feet) water. I also understand they will forage into shallower water during the night and can be found there during low light conditions such as early morning and late in the day. I'm sure you can also throw the book out the window and catch them on the surface in the middle of a sunny August afternoon. Because the resident silvers don't seem as prevalent here in the north sound (I'd appreciate any insight on that topic), I've spent some time this fall and winter targeting the local blackmouth. I've had success from the boat at spots known as productive mooching sites. The Calamarko squid pattern featured in Les Johnson's Fly Fishing for Pacific Salmon II is my go-to fly. I use a 300 grain sink tip and look for conditions that will allow maximum sink (low wind, tidal exchange). I've haven't seen much "chatter" on the blackmouth fishery, so hopefully there are others who can correct me where I've gone wrong or just provide more information.