Besides looking at the Gums you can tell a Silver by the tail. The black dots are not as pronounced
Plus the tail of a Silver is softer. Make a fist and slide your hand over the tail. If it is stiff or
rigid it's a Chinook if it's soft and folds it is a Coho. I have been fooled by the mouth.
The Silvers are huge on the West Coast of Vancouver Island. It's easy to mistake one in July
when you're not expecting Eighteen pound Coho. Seen many Coho mistaken as Chinook because of size.
Yes, that's another way to tell also, but I think you may have it backwards. Chinook have spots on upper and lower part of their tail and silvers only have spots on the top part of the tail! I'm with Dan9113 though...that's what they'll look for is the lower gumline! If unsure, better check...and check...and check :grin:
What's good about using the gumline is that you can usually, and positively, identify the species without having to net it or take it out of the water, both of which greatly increase the likelihood of mortality.
Blackmouth - chinook
Any white around gums - most likely coho