This beautiful specimen is a colour illustration of a Zeus Opah (King Fish); the original copy can be seen below:
The scientific name for the Opah is Lampris guttatus; it’s a large fish that can grow up to 2 m long and weigh hundreds of pounds. The fish can be found in eastern North Atlantic, North Sea and Mediterranean seas; it feeds on small fish, squids and crustaceans.
No human being, however great, or powerful, was ever so free as a fish.
– John Ruskin