Tropical

Longtail Tuna

Thunnus tonggol

3.8

At a Glance

Avg Length

30"

Avg Weight

20 lbs

World Record

79.3 lbs

Habitat

Indo-Pacific Coastal

About the Longtail Tuna

Longtail Tuna (Thunnus tonggol). Found in Indo-Pacific Coastal. Average length 30 in, weight 20.0 lbs. World record: 79.3 lbs (Montague Island, Australia).

The Longtail Tuna is one of the most recognizable saltwater species in North American waters, classified scientifically as <em>Thunnus tonggol</em>. It belongs to the Tropical group, most commonly found in indo-pacific coastal environments. Anglers target this species for both sport and table fare, and it appears across a broad range of water bodies throughout the United States.

A typical Longtail Tuna runs 30 inches in length and weighs around 20 pounds, though fish in prime habitat regularly exceed these averages. The all-tackle world record stands at 79.3 lbs, set at Montague Island, Australia, making it a legitimate target for anglers chasing personal bests. Conservation status varies by region — check local regulations before keeping fish, as some waters have slot limits or catch-and-release requirements in place.

Habitat & Range

Primary habitat: Indo-Pacific Coastal.

The Longtail Tuna thrives across a wide range of saltwater environments throughout North America. Seasonal movements are driven by water temperature — fish tend to move into shallower water during spring and fall feeding periods, and push deeper or seek cover during the heat of summer and cold of winter. Understanding these patterns is critical to locating fish consistently across the season.

How to Fish for Longtail Tuna

Best bait: Pilchards.

Technique: Trolling.

Match your presentation to the season and conditions. In clear water, downsize your bait and slow your retrieve. In stained or muddy water, switch to high-contrast colors and add vibration. Early morning and evening are the most productive windows during summer months. During spawning season, fish become highly territorial and will strike out of aggression as well as hunger.

World Record

The all-tackle world record Longtail Tuna weighed 79.3 lbs, caught at Montague Island, Australia. This record represents the upper end of what this species achieves under ideal conditions. Most anglers targeting personal bests focus on proven trophy waters with the right combination of habitat, forage base, and light fishing pressure.

State Regulations

Regulations vary by state and water body. Before fishing for Longtail Tuna, verify current size limits, bag limits, and open seasons with your state fish and wildlife agency. Check your state's fishing license requirements and season dates at the FishLog Fishing License guide.