Blue runner

Blue Runner (Caranx crysos), also known as the bluestripe jack, Egyptian scad, or hardtail jack, is a widespread species of marine fish in the jack family (Carangidae). It is found in the Atlantic Ocean, ranging from Nova Scotia in Canada to northern South America, and throughout the Gulf of Mexico and the Mediterranean Sea. This species is of moderate importance to both commercial and recreational fisheries.

Description

The Blue Runner is a medium-sized fish, typically reaching lengths of 60 cm (24 in), but can grow up to 70 cm (28 in) in length. It has a slender, streamlined body that is blue-green on the back and fades to a silvery white on the belly. The species is easily identified by its two dorsal fins; the first consists of eight spines and the second of one spine followed by 20-23 soft rays. The anal fin has two detached spines followed by one spine and 16-18 soft rays. The fish's diet primarily consists of small fish, zooplankton, and crustaceans.

Habitat and Distribution

Blue Runners are pelagic fish that prefer offshore waters but are also found in coastal areas, including bays and estuaries, especially during their juvenile stage. They are known to form large schools and are often associated with reefs, shipwrecks, and other structures that provide shelter and feeding opportunities. Their distribution in the Atlantic Ocean covers both tropical and subtropical waters.

Behavior

This species is known for its fast swimming and agility, which it uses to evade predators and catch prey. Blue Runners are opportunistic feeders and have a varied diet that includes smaller fish, cephalopods, and various crustaceans. They are also known to follow large predators to feed on the leftovers of their kills.

Reproduction

Blue Runner spawns throughout the year, with peaks varying by geographical location. They are pelagic spawners, releasing their eggs and sperm into the water column where fertilization occurs. The larvae are planktonic, drifting with the currents until they are large enough to join adult schools.

Fisheries and Aquaculture

While not the primary target of commercial fisheries, Blue Runners are caught incidentally in purse seine and gillnet fisheries targeting other species. They are valued for their fight on light tackle and are a popular game fish among recreational anglers. In some regions, Blue Runners are used as bait for larger game fish. There is no significant aquaculture production of Blue Runners.

Conservation

The International Union for Conservation of Nature (IUCN) has not assessed the Blue Runner for a conservation status. However, due to their wide distribution and abundance, they are not currently considered to be at risk. Management measures are in place in some regions to ensure sustainable fisheries.

Gallery

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  Blue Runner (Caranx crysos)

• Blue Runner school.jpg

  School of Blue Runners

See Also

• Fisheries management
• Marine conservation
• Pelagic fish

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