The Almaco Jack (Seriola rivoliana) is a game fish belonging to the family Carangidae, the same family as the Amberjack and Yellowtail. They feed day and night on other smaller marine life such as small squid and baitfish.
The Almaco Jack is wide-ranging in offshore waters and the young are associated with sargassum. They spawn offshore during spring, summer and fall.
Information & Facts:
The Almaco Jack has a more flattened and less elongated body than most other Jack species. Their dorsal fin and anal fins are elongated, and their outer edges have a sickle shape.
The first rays of the Almaco dorsal fin’s longest parts are nearly twice as long as the dorsal spines, which is also different from other Jacks.
Almaco Jacks grow on average, to 90 centimetres (35 in), sometimes reaching 160 centimetres (63 in) and 59.9 kilograms (132 lb).
They are usually dusky-colored with faint amber or olive stripes down their sides. Their upper bodies and lower fins are usually dark brown or dark blue-green. The belly is much lighter and appears brassy or lavender. The ‘nuchal bar‘ and most of the fins are dark on adult Almaco Jacks, except for the pelvic fins which are white on the ventral sides.
The Almaco Jack is a ‘pelagic‘ species that can be found in small groups on slopes and off reefs at depths from 5 to 160 meters (2.7 to 87.5 fathoms). In the western Atlantic, they live mostly all the way from Cape Cod to northern Argentina, although very rarely found off North and South Carolina.
They usually swim at depths ranging from 5–35 meters (16–115 ft).
The Almaco Jack remove skin-based parasites by rubbing against the rough skin of passing sharks. They also rub against passing scuba divers because they mistake them for sharks.
These fish spawn as often as weekly throughout the year.