pelagic, saltwater
Little Tunny
Euthynnus alletteratus
Streamlined, fusiform body built for high-speed swimming; dark bluish-green back with distinctive wavy, broken dark stripes (worm-like markings) above the lateral line; several dark spots below the pectoral fin; silvery-white belly; strong crescent-shaped caudal fin and slender caudal peduncle with keels.
- Habitat
- Epipelagic, coastal and offshore marine waters worldwide…
- Size & weight
- Typically 60 to 80 cm in length and weighing around 3 to…
- Diet
- Carnivorous predator feeding primarily on small schoolin…
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Physical characteristics
Streamlined, fusiform body built for high-speed swimming; dark bluish-green back with distinctive wavy, broken dark stripes (worm-like markings) above the lateral line; several dark spots below the pectoral fin; silvery-white belly; strong crescent-shaped caudal fin and slender caudal peduncle with keels.
Habitat & distribution
Epipelagic, coastal and offshore marine waters worldwide in tropical and temperate zones, frequently found near the surface in the Mediterranean Sea.
Behavior
Highly migratory, highly active, and forms large, fast-swimming schools often mixed with other small tunas and pelagic species, operating primarily as a diurnal hunter.
Diet
Carnivorous predator feeding primarily on small schooling fish, squids, and crustacean larvae, hunting cooperatively in fast-moving packs.
Reproduction
Broadcast spawner releasing eggs and sperm into the open water column in warm offshore waters, characterized by rapid juvenile growth and high fecundity.
Ecological role
Acts as both an important apex consumer controlling smaller fish populations and a vital prey species for larger pelagic predators like sharks, billfish, and marine mammals.
Similar species
Skipjack tuna (Katsuwonus pelamis) which features distinct straight longitudinal stripes on the belly, and Atlantic bonito (Sarda sarda) which has slanted stripes along its back.
Identification tips
Look for the distinct broken, wavy dark lines on the upper back above the lateral line and the dark spots located near the pectoral and pelvic fins.
Interesting facts
Like many members of the family Scombridae, the little tunny exhibits elevated body temperatures through vascular counter-current heat exchangers, allowing for high-performance swimming in cooler waters.
Field notes
Mediterranean Sea