This Fish Has a Serious Case of the Blues

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There are a lot of brightly colored fish in the world, but lingcod, which are usually brown and white, can sometimes end up quite blue, and not just on the outside.

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Sources:
https://link.springer.com/article/10....
https://journals.plos.org/plosone/art...

Images:
https://www.istockphoto.com/photo/the...
https://www.istockphoto.com/photo/cod...
https://link.springer.com/article/10....
https://www.istockphoto.com/photo/hex...
https://commons.wikimedia.org/wiki/Fi...
https://www.flickr.com/photos/2621638...
https://www.inaturalist.org/photos/77...
https://journals.plos.org/plosone/art...
https://link.springer.com/article/10....
https://commons.wikimedia.org/wiki/Fi...
https://www.flickr.com/photos/4172364...
https://link.springer.com/article/10....
https://www.inaturalist.org/observati...
https://commons.wikimedia.org/wiki/Fi...
https://www.istockphoto.com/photo/lin...
https://www.shutterstock.com/image-ph...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://www.inaturalist.org/observati...
https://www.inaturalist.org/observati...
https://www.inaturalist.org/observati...
https://www.istockphoto.com/photo/lin...
https://www.shutterstock.com/image-ph...
https://www.istockphoto.com/vector/bl...