There is an interesting book called "Cod" which traces the role of this fish through history.

It's not a barn burner, but it is an interesting read.

There is a sequel to the book called "Salt" but it is not as gripping, and is somewhat dry.

Excerpt from Robert Crais' "The Monkey's Raincoat:"
"She took another microscopic bite of her sandwich, then pushed it away. Maybe she absorbed nutrients from her surroundings."