Larger wahoo (i.e. over 40 lbs) are generally solitary, but may occasionally be found in groups of two or three. Smaller wahoo are sometimes encountered in small- to medium-sized loose schools; in some areas wahoo of all sizes appear to aggregate during specific times of the year. Whether this behavior is widespread or confined to certain parts of the world, or related to some cyclical or seasonal activity, is not known. Speculation is that some type of spawning or feeding behavior is involved, but for now that remains unproven.

Whether or not wahoo from different regions migrate to feed and/or spawn is not known. Migration to spawning areas and migration to warmer water has been speculated, however the exact nature of wahoo migration, if it even occurs, remains inconclusive. A research project conducted about 30 years ago suggests that wahoo from the western Atlantic spawn during the summer off of the Carolinas. A more recent project surveyed individual wahoo from the Bahamas during the winter. This survey revealed many individuals that were not in spawning condition. This implies that although the number of wahoo increases substantially during the winter in the Bahamas, the aggregation may not be related to reproduction. There are no scientific results on the reproductive behavior of wahoo from other regions. If wahoo do in fact migrate, an indication of just how far they can travel was provided by the recapture of a tagged fish in the Pacific. The wahoo was recaptured 6.5 months following capture, 1,707 miles away. 

Wahoo growth rates have not been conclusively determined, however there is some evidence indicating that wahoo may grow quite rapidly. Only a couple of fish have been tagged and recovered such that their weight change over time could be calculated. One of these fish grew about 22 lbs in just 10 months, from 11 lbs to 33 lbs. Like many other questions concerning wahoo, more research is needed to determine how typical this one growth rate really is. Growth rates can vary depending on age, sex, and region. Because of this, sample sizes need to be large and need to include individuals from many regions, of both sexes, and of varying sizes.

The size and age at which wahoo become sexually mature is another life history parameter that has not been well researched. There has been one study, in which gonads of wahoo from Louisiana and Bimini were surveyed. This study showed that males as small as 7 lbs and females as small as 12 lbs were sexually mature. Although the exact relationship between size and age has not been established for wahoo, the presumption is that fish of this size are relatively young. This was a very good first look at the issue, but the number of fish surveyed was small. As with many other aspects of wahoo life history, more research needs to be done on more fish from these regions, and from other regions as well.

Adult wahoo are high trophic level predators. Surveys of stomach contents in the Atlantic reveal butterfish, mackerel, bonito, scad, flying fish, puffer fish, and squid as their primary food sources. There are no known stomach surveys of Pacific or Indian Ocean fish. The wahoo's morphology is well-adapted to this predatory existence. They have a streamlined, fusiform body with drag-reducing finlets and a well developed musculature. The body is stiff and propulsion is provided by movement of the caudal portion of the body only, which minimizes turbulence drag. Additional drag reducing adaptations include a pointed jaw, and dorsal and pectoral fins that fold into grooves during rapid swimming. These features allow wahoo to reach speeds of 80 kmh (60 mph), and combined with numerous small sharp teeth make them an efficient predator.

Wahoo are a relatively large fish, ranging from about 11 lbs to 78 lbs (5 kg - 35 kg). The official record for the largest wahoo caught with hook and line is 158 lbs (72 kg). In 2001 a wahoo weighing 202 lbs. (92 kg) was reported caught with hook and line off Baja, Mexico but the actual weight could not be certified. A commercial long line vessel once reported bringing in a wahoo weighing around 218 lbs.  The Wahoo Research Project has collected individuals ranging from 9 lbs - 118 lbs (4 kg - 54 kg)