I haveŽnt heard of Mclane, but yes, we call them "cangrejo" in argentina and its called "pancora" in chile. And yes, IŽve heard the same thing, that salmon eating lots of shrimp gives them that color, same with the crabs and trout.
Thanks for the patterns they look nice, that body material looks like it could emulate a spoon effect under water.
Juro check out the Tolten river in south chile, they have nice salmon runs or you can fish for "fario" browns with crab imitations. The river close to my home is a very...how to say...humble river.