What Do Mahi Mahi Eat? Diet, Prey, and Feeding Habits in the Wild

Mahi mahi have a reputation as flying fish specialists, and that’s not wrong, but it undersells how varied their actual diet is. Recent research using DNA barcoding on stomach contents has given scientists a far more precise picture than older visual identification methods ever could.

The Core Diet: Flying Fish, Squid, and Small Pelagics

Mahi mahi hunt almost entirely by sight in well-lit surface water, striking fast-moving prey rather than grazing or scavenging. Flying fish are a favorite target and a major part of their diet across most of their range, alongside squid, mackerel, sardines, halfbeaks, and crabs. This prey profile lines up directly with where mahi mahi live and hunt: near the surface, in open water, chasing whatever is fast enough to share that space with them.

What DNA Barcoding Revealed

A multi-year study examining roughly 200 mahi mahi stomachs collected around Oʻahu, Hawaii between 2019 and 2022 used DNA barcoding to identify prey remains far more precisely than visual inspection allows, since digested fish are often impossible to identify by sight alone. The results showed a genuinely wide diet: squid species like the jumbo Humboldt squid (Dosidicus gigas) made up a significant share of stomach contents, alongside multiple fish species, and a large share of prey turned out to be juvenile reef-associated fish, including goatfish, needlefish, snake mackerel, and triggerfish, species not typically associated with an open-ocean hunter.

Diet Shifts by Region

What a mahi mahi eats depends heavily on what’s actually available where it’s hunting. Around Hawaii, where reef systems sit close to deep open water, juvenile reef fish make up an outsized share of the diet. In other parts of the world, where mahi mahi hunt farther from any reef structure, flying fish and squid dominate more heavily. It’s less that mahi mahi have a fixed menu and more that they’re efficient generalists, built to exploit whatever fast-moving prey is locally abundant.

Why This Matters for How They’re Caught

Their hunting style directly explains why certain baits and lures work so well. Because mahi mahi hunt by sight rather than smell, bright colors and fast, erratic movement, mimicking a fleeing flying fish or squid, trigger far more strikes than a slow-moving or scent-based presentation. It’s the same visual, high-speed hunting behavior that makes trolled ballyhoo and skirted lures effective virtually everywhere mahi mahi are found.