New to fishing in WA on the OP but had a fun first season this year with a handful of coho landed. I'm looking to expand a bit into new locations/rivers this coming summer and fall. I've been reading up, and In the regs (for several rivers), it will list limits by adult fish and non adults (Jacks I guess). I can't seem to find what is defined as an adult fish. I haven't called the WDFW info line but wondered if anyone else has ever found this a kind of vague description? Is this info. somewhere in the regs and I'm just missing it?

Thanks, lots of good reading here.