Common Dolphinfish

Overview

The Common Dolphinfish, widely known as mahi-mahi or dorado, is a highly migratory, fast-swimming pelagic species found in tropical and subtropical oceans worldwide. Despite its common name, it is not related to marine mammals and is instead a member of the family Coryphaenidae, distantly related to perch.

Distribution & habitat

This species is circumglobal, inhabiting the Atlantic, Indian, and Pacific Oceans, typically in waters ranging from 21°C to 30°C. While they are primarily open-ocean dwellers, they are also frequently encountered in coastal waters and are often associated with floating debris or fish aggregation devices.

Appearance

The Common Dolphinfish has a compressed, elongated body and a long, continuous dorsal fin that runs from the head nearly to the tail. They are known for their brilliant coloration, featuring metallic blue-green backs and golden-silver sides, often accented with dark spots or golden blotches. A key diagnostic feature is the sexual dimorphism in adults: males develop a prominent, blunt bony crest on the forehead, while females maintain a more rounded, streamlined head profile.

Biology & behavior

These fish are opportunistic predators that form schools and are capable of rapid growth, reaching sexual maturity in as little as 4 to 5 months. They are known for their speed and agility, often hunting near the surface. Spawning occurs in the open sea, with activity often peaking as water temperatures rise.

Feeding

As non-selective, opportunistic feeders, they consume a wide variety of prey, including zooplankton, crustaceans, squid, and various species of fish, such as tuna.