i have caught both the blue ling cod and the greenling and it is a very close comparison. they were both turquiose on the skin and the flesh.the picture of the greenling isnt a good example because with a greenling its nose looks reptilian and it has huge teeth compared to the ling cod. the ling cod's nose is smooth and normal looking and it resembles the picture you posted.
As far as I know, there are a number of species of green lings. The greenling shown is a kelp green ling. They, and all other green lings, are cousins of the ling cod. The ling cod is usually brown with white flesh, but it often has a blue or greenish hue in both the skin and flesh. Most of the blue ones I've caught have been smaller, but I know that there are big blue ones too. I don't know what causes the variation, but they both occur in the same areas, so probably not diet. The blue flesh turns white when cooked and tastes exactly the same as the other ones.
Male kelp greenling are great bait for large lings. I've caught blue ling bigger than 20lb... on the same spot I've caught brown ones that size - I don't think size have anything to do with the colour but I don't know what does. Small ling are good bait for biggens too. And a funny thing about really small ling - like < 10" - they jump all the time.
I can't even thing of another fish with blue flesh... I do remember hearing cabozon can be blue too and if so maybe it a food thing.
Have fun, Jason
Was going to say sure it wasnt cabizon.... I have never seen a ling with blue on it. Cabizon look a lot like a ling, way more so that the greenlings or kelpcod and do get up there in wieght.... seen them in the teens
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