Scientists can tell how old a fish is by reading the growth rings on the fish scales, a lot like they do with tree rings. 

Steelhead and rainbow trout are the same species, but rainbow trout are freshwater fish only, while steelhead are anadromous.

October 6, 2011 | Categories: From the Gremlin

Steelhead and rainbow trout are the same species, but rainbow trout are freshwater fish only, while steelhead are anadromous.

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