Pilotfish

The Pilotfish is a distinctive open-ocean member of the jack family (Carangidae), famous for its close association with sharks, rays, sea turtles, and other large marine animals, which it often accompanies closely. Found circumglobally in tropical and warm temperate seas, it is the sole species in its genus, Naucrates, and is easily recognized by its striking pattern of dark vertical bars. Historically believed to guide sharks to food - hence its common name - modern understanding attributes the association more to shelter, feeding on scraps, and protection from other predators. It is widely distributed and abundant, with no significant conservation concerns.

• Slender, elongate, torpedo-shaped body
• Silvery-blue background with 5-7 bold dark vertical bars along the flanks
• Blunt, rounded snout
• Deeply forked tail, often with white tips on the lobes
• Small, finlet-like extension in front of the tail
• Rounded dorsal fin lacking large spines

Typically 30-50 cm, up to 70 cm. Its bold barred pattern and close, persistent swimming alongside sharks or other large animals make it one of the easiest carangids to identify in the field.

Pilotfish inhabit open, offshore waters throughout tropical and warm temperate oceans worldwide, typically near the surface in association with large pelagic animals such as sharks, manta rays, and sea turtles. They are rarely found far from a host animal as juveniles and sub-adults, using the host for shelter and to access food scraps, though adults may become more independent and occasionally shelter near floating objects instead. They generally occupy the upper water column in open ocean environments rather than reef or coastal habitats, ranging widely wherever their host species travel across tropical and subtropical seas.

Pilotfish are best known for closely trailing large marine animals, particularly sharks, swimming just ahead of or alongside the host's snout or beneath its body. This association is thought to provide protection from predators, access to food scraps and parasites, and possibly hydrodynamic benefits from swimming in the host's wake. They feed opportunistically on small fish, invertebrates, and leftover scraps from the host's feeding activity. Juveniles may also associate with floating debris before finding a host animal. Though historically believed to guide sharks toward prey, modern science regards this as commensal or mutualistic hitchhiking rather than active navigation on the shark's behalf.