Will the chum likely be silver or green? Those guys once they turn colors are very recognizable. Are they good eats?
By the time they get to the Vedder, they're pretty colored up. You'll know a chum when you run into one. As for eats... they're fine if you get a fresh one (silver with barely visible stripes). Just not a whole lot of flavor.
For those who don't like the taste of salmon, chum would be a good bet. Cook it in a recipe with lots of added flavor. Beer batter, fish and chips, pan fried with butter etc? They're great smoked. Ideally it would be a clean one, but you could get away with a slightly colored one if it has a white belly and you're going to smoke it.
All else being equal, a male is better table fare IMO. Handle your fish, especially with pinks, properly (bleed well, on ice or cooled in timely manner) and the flesh should remain decently firm. Pinks go soft really quick because of the warmer weather. Chums in freshwater just look toxic..haha.