Queensland State Archives posted a photo:
Artwork by Frank Olsen.
Also known as the mahi-mahi, this surface-dwelling ray-finned fish is found in off-shore temperate, tropical and subtropical waters worldwide. ‘Mahi’ means ‘very strong’ in Hawaiian. Despite their common name, being fish they are not related to dolphins.
The common dolphinfish is an open ocean predator that eats small fishes, squids, and pelagic crustaceans. It is also an important prey species for sharks, billfishes, and other large predators. Therefore, much like the skipjack tuna, this species plays a vital intermediate role in open ocean food webs.
This fish is beautifully coloured – typically bright, blue, green, and gold, almost cartoon-like. Out of the water, the fish often change colour, (giving rise to their Spanish name, dorado, “golden”), going through several hues before finally fading to a muted yellow-grey upon death.
Information from Oceana and Wikipedia.
Queensland State Archives, Digital Image ID 6109