A great barracuda hunts by ambush and lunges head-on, starting the lunge with an S-shaped bend of the body, according to high-speed video. Researchers measured an average strike velocity of 144 cm/s for the great barracuda, compared with 64 cm/s for the redfin needlefish. The Florida Museum of Natural History estimates that its top speed may be as fast as 36 mph (58 km/h). That is an estimate for the species, not a measured speed.

Barracudas use a feeding style that Field Museum scientists named 'ram-biting': a ram strike followed by biting with a scissor-like motion of the jaws. At the back of the jaw a strong palatine bone carries large triangular, blade-like teeth that face the lower jaw, so the two sets of teeth work together like scissors. A computer model predicted a bite force at the lower jaw of as high as 9 newtons in large barracuda. This is a prediction from jaw anatomy, not a force measured on a living fish.

Scientists tagged two large great barracuda off South Florida with pop-up satellite tags for 15 days. One traveled at least 471 km in a straight line, and the other at least 1231 km. Both dived to depths of 145.2 m and 186.9 m for short periods, and both used deeper water at night. In an acoustic tracking study of 32 great barracuda at Buck Island Reef National Monument in the U.S. Virgin Islands, three analysis methods showed high site fidelity, paired with less frequent broad exploratory movements. In the Buck Island study, how often each barracuda was detected changed its estimated home range and made it harder to find what shaped it.

In a Bahamas study, researchers captured 38 wild adult great barracuda and tested them for ciguatoxins. Twenty of the barracuda were fitted with acoustic transmitters and tracked by 50 receiving stations covering over 44 square kilometers for 321 days. Barracuda that tested positive for ciguatoxin were more often found along the edge of the continental shelf, in deep reef areas that local fishermen can reach. The authors caution that the link between toxin and home range is only a hint: fish that tested positive 'may have smaller home ranges' than non-toxic fish, based on 20 tracked fish. Ciguatoxin is made by tiny reef algae-like organisms; small fish eat them, and the toxin builds up in the bigger fish that eat those fish. As of November 2026, NOAA reports that at Flower Garden Banks National Marine Sanctuary it tested large reef fish for ciguatoxin. In 2013, of 52 fish (barracuda, Warsaw grouper, greater amberjack and vermilion snapper), 48% had measurable ciguatoxin, and ten fish (19%) had enough to cause illness.

As of November 2026, the IUCN Red List lists the great barracuda as Least Concern, assessed on 29 January 2013, and the Florida Museum notes it is not listed as endangered or vulnerable. A 2019 national assessment for the United Arab Emirates rated the great barracuda Data Deficient, because catch in Abu Dhabi had declined by 96% since 2011 and the cause was not known.

Scientists still do not agree on when and where great barracudas spawn: one source reports spring, another says it follows phases of the moon, and another says year-round except winter. The timing and place have not been well documented; it is believed to take place in deeper, offshore waters.

Words to know

• transmitters: signal tags
• fidelity: keeping faith
• ciguatoxin: natural toxin
• assessment: careful review
• spawn: lay eggs