AT A GLANCE
- Common Name: Atlantic Saury
- Scientific Name: Scomberesox saurus
- Category: Fish
- Subcategory: Bony Fishes
- Range: Temperate and subtropical waters of the Atlantic Ocean and Mediterranean Sea; disjunct populations in the Southern Hemisphere (South Atlantic, southern Indian Ocean)
- Habitat Type: Open epipelagic oceanic waters, swimming near the surface in offshore temperate waters, rarely approaching close inshore
- IUCN Red List Status: Least Concern
- Lifespan: 3 to 5 years
- Diet: Carnivorous/Planktonivorous (pelagic zooplankton, copepods, euphausiids, fish eggs, and larval fishes)
- Average Size/Weight: Length 25 to 35 cm (maximum up to 50 cm); weight 150 to 350 g
- Key Defining Feature: Slender, needle-like oceanic fish with an elongated beak-like snout, shimmering metallic blue-green back, brilliant silver flanks, and a row of tiny finlets behind the dorsal and anal fins
Overview
The Atlantic Saury (Scomberesox saurus), widely known across seafaring communities as the Skipper or Needlefish, is a highly streamlined, fast-swimming epipelagic schooling fish belonging to the saury family Scomberesocidae. Roaming the open surface waters of the North Atlantic Ocean and Mediterranean Sea in vast glittering shoals, this silvery ocean wanderer is famous for its incredible leaping ability: when pursued by hungry tuna, swordfish, or dolphins, entire schools launch into the air, skipping across the ocean surface like flying needles.
Biology and Physical Characteristics
Scomberesox saurus has an exceptionally slender, laterally compressed, elongated body encased in small, delicate, easily detached cycloid scales. Its jaws are extended forward into a slender, fragile beak, with the lower jaw slightly longer than the upper jaw, armed with tiny, delicate teeth. Its coloration exhibits classic oceanic countershading: a radiant, dark metallic blue-green or iridescent sapphire along the back, transitioning into bright mirror-like silver on the sides and a pure silvery-white belly. Behind its dorsal and anal fins, it features a series of five to seven isolated, miniature finlets identical to those found on mackerels and tunas, which reduce drag during high-speed swimming.
Behavior and Ecology
Atlantic Sauries are oceanic nomads that undertake extensive seasonal migrations, moving northward into cool subarctic waters in summer to feast on rich blooms of copepods and euphausiid krill, and returning southward to subtropical waters in winter to spawn. They cruise just inches beneath the surface tension of the ocean. When attacked by predators, sauries execute spectacular evasive maneuvers called ‘skipping’: they burst out of the water at high speed, skimming and skipping along the surface on their tails for dozens of meters before re-entering the water, confusing underwater pursuers.
Conservation and Human Impact
The Atlantic Saury is classified as Least Concern on the IUCN Red List. It is an abundant and ecologically vital forage fish in the North Atlantic, serving as a primary trophic bridge between microscopic zooplankton and apex marine predators including bluefin tuna, swordfish, marlin, shearwaters, and pelagic dolphins. It supports commercial pelagic fisheries in the eastern Atlantic, caught primarily with light-attracting purse seines.
Interesting Factoid
When pursued by hungry tuna or dolphins, schools of Atlantic Sauries explode out of the water in unison, literally skipping and bouncing across the ocean surface on their tails like thrown skipping stones.