You guys need to know for sure. Eyeballing the tail is not a good indicator. The most difinative way to tell the difference according to the Oregon Fishing Regulations is to look at the gums BETWEEN THE TEETH. IF the gums are white BETWEEN THE TEETH, then it is a coho (or Silver). If the gums are black all over including BETWEEN THE TEETH, then it is a Chinook (or King). You will learn to id most fish quickly when they are obviously one or the other, but for those too close to call, you should use the BETWEEN THE TEETH method.

Just my $.02
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Can't wait to see how the other 10% live!