Dolphinfish
Coryphaena hippurus
Overview
The dolphinfish is easily recognised by its colouration; golden-yellow on the sides with vibrant blues and greens on the back. It has a long, slender body with a sharply sloping forehead.
Adult males, called bulls, have a more pronounced forehead than females. They are fast-growing fish, with an average length of 1.5m and an average weight of 22kg.
- Found in
- Atlantic Ocean, Indian Ocean, Pacific Ocean
- Class
- Actinopterygii
- Order
- Carangiformes
- Family
- Coryphaenidae
- Genus
- Coryphaena
Conservation Status
The dolphinfish is considered a species of Least Concern that is popular as both a commercial and recreational fish. Overfishing, compounded by its migratory nature and fast growth, makes accurate stock assessment difficult, and bycatch is another concern. Data on population size, fishing mortality, movement and spawning aggregations are sparse, meaning fishery managers often must make decisions with significant uncertainty. Warming oceans and shifts in prey or current patterns may further stress dolphinfish stocks, though the extent of these effects is not yet fully quantified.
Management plans have introduced catch limits, minimum conservation reference size and technical rules to reduce harmful fishing practices. Fishermen are being trained in best practices, bycatch-reduction, and are adopting monitoring systems for more reliable data collection. Some producers have developed a Code of Conduct to coordinate sustainability efforts, share data, and align management across national boundaries.
Overall, while dolphinfish are not currently endangered, sustainability requires both local regulation and international cooperation.
- Wild Population
- Unknown
- Conservation Status
- Least concern
Animal Facts
- Despite the name ‘dolphinfish’, they are not related to dolphins and are named for their tendency to swim alongside boats like dolphins do.
- The term mahi-mahi comes from Hawaiian and translates to ‘strong strong’, reflecting their strength, speed, and fighting ability when hooked.
- Dolphinfish can swim up to 92km/h, making them one of the fastest fish in the ocean.
- Dolphinfish only live about 4 to 5 years, but they grow extremely fast, reaching over a metre in length within their first year.
- Anglers prize dolphinfish for their fight, appearance and taste. Dolphinfish is a popular ingredient in cuisines worldwide.
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Social & Reproduction
Dolphinfish are generally social and schooling fish, especially when they are young or of similar size. Juveniles and smaller adults often travel in large, fast-moving schools, which helps them hunt efficiently and avoid predators. As dolphinfish grow larger, they tend to become less social; mature males are often alone or in pairs with females rather than in big groups.
Spawning occurs in warm tropical and subtropical waters throughout much of the year, though it tends to peak in warmer seasons or regions. Courtship typically occurs near the ocean surface, where males and females engage in close swimming displays. Males, distinguished by their more prominent foreheads, may pursue and circle females, displaying their vibrant colouration during courtship. Dolphinfish are pelagic spawners, meaning females release eggs directly into open water, where males fertilise them externally.
A single large female can produce hundreds of thousands of eggs per spawning event, and spawning can occur several times per year. The fertilised eggs float freely in the plankton-rich surface layer, hatching within 2 to 3 days.
The larvae are extremely vulnerable, but they grow rapidly and reach juvenile size in just a few weeks. Young dolphinfish often seek shelter among floating seaweed or debris, forming small schools that provide protection and feeding opportunities. Growth is fast, with individuals capable of reaching sexual maturity within 4 to 5 months and attaining over a metre in length within their first year. The dolphinfish exhibits a rapid and prolific reproductive cycle that reflects its short lifespan and fast growth rate.