Blue fish color

[lennyr]

I had a chance last nite to fish from a boat at Barrington beach in R.I. I mostly fish Fairhaven Ma. waters from the surf. I caught a blue fish that was very black colored on its back near the dorsal fin. Can blues be a different color in different locations? Most i get around home are green colored and only one caught at barrington was this color. Just somthing I have not seen before and wondering if anyone else has experienced this.