Sign In

Almaco Jack

Almaco jack, also known as longfin yellowtail or greater amberjack look-alike, is a powerful offshore reef predator in the jack family (Carangidae). It is found in warm temperate and tropical waters worldwide and is closely associated with deep structure. Almaco jack are known for their strength, deep-water behavior, and tendency to hold tight to reefs and wrecks.

Scientific Classification

  • Family: Carangidae
  • Genus: Seriola
  • Species: Seriola rivoliana
Almaco jack are closely related to greater amberjack but can be distinguished by fin length, body shape, and coloration patterns.

Identification and Physical Characteristics

Almaco jack have a deep, laterally compressed body built for power rather than speed. The body is thicker and more compact than amberjack, with noticeably elongated dorsal and anal fins that extend farther toward the tail. The head is blunt with a strong jaw structure designed for crushing and gripping prey.

Coloration is generally olive to bronze along the back, fading to silvery sides and belly. A faint dark stripe may run through the eye. Unlike greater amberjack, almaco jack often lack a strong amber lateral stripe, especially in mature fish.

Size, Weight, and Growth

Adult almaco jack commonly measure between 30 and 55 inches in length. Weights typically range from 20 to 80 pounds, though larger individuals have been recorded. Almaco jack grow steadily and can live for multiple decades, with larger fish often holding deeper structure.

Juveniles grow quickly and are more likely to be encountered in shallower offshore waters before moving deeper with age.

Distribution and Range

Almaco jack are widely distributed in the Atlantic, Pacific, and Indian Oceans. In the western Atlantic, they are found from the southeastern United States through the Gulf of Mexico, Caribbean, and into South America.

Their presence in any given region is influenced by water temperature, depth, and the availability of suitable structure rather than seasonal coastal migrations.

Habitat Preferences

Almaco jack are strongly structure-oriented and prefer deeper offshore environments. They are most commonly found at depths ranging from 100 to over 1,000 feet. Preferred habitats include:
  • Deep reefs and hard bottom
  • Shipwrecks and artificial reefs
  • Steep drop-offs and ledges
  • Offshore seamounts and pinnacles
They are rarely encountered in nearshore waters and are considered a true offshore species.

Behavior and Movement

Almaco jack are not highly migratory compared to other jacks. Instead, they tend to remain resident around specific structures for extended periods. They may move vertically through the water column during feeding but generally stay close to bottom relief.

They are often encountered as solitary fish or in small groups rather than large schools.

Diet and Feeding Strategy

Almaco jack are aggressive predators that feed primarily on bottom-oriented and mid-water prey. Their diet commonly includes:
  • Squid
  • Octopus
  • Crustaceans
  • Bottom fish and reef-associated species
They rely on strength and sustained pressure rather than speed, often pulling prey away from structure before consuming it.

Importance to Fisheries

Almaco jack are targeted primarily by recreational anglers, especially in deep offshore fisheries. They are less prominent in commercial markets but are valued as a hard-fighting sport fish. Meat quality is generally considered good, though handling and preparation play a major role due to their high activity level and deep-water capture.

Management regulations vary by region and often align with broader jack or amberjack rules.

Fishing for Almaco Jack

Almaco jack are typically targeted using vertical jigging, deep dropping, and heavy bottom fishing techniques. Because they hold close to structure, strong tackle and abrasion-resistant leaders are commonly used.

Success depends on precise depth control, accurate structure positioning, and the ability to apply sustained pressure to pull fish away from bottom.

The Fight

Once hooked, almaco jack are known for immediate, powerful dives toward structure. They rely on brute strength rather than long runs, often attempting to break anglers off quickly. Heavy drag settings, short pumps, and constant pressure are essential to land larger fish successfully.