Sardines are small, streamlined fish that form vast, shimmering schools in coastal waters worldwide. They typically reach 15–25 cm and are silvery with a darker back, easily spotted as they move in coordinated bait balls. Divers encounter them most often in nutrient-rich upwelling zones and temperate seas, where they feed on plankton and in turn attract larger predators. Their collective behaviour—sudden directional shifts and tight packing—makes them one of the ocean's most dynamic sights.
Most likely to be seen at
Sites where its range and habitat make it likely — not yet confirmed by a logged sighting.