Jack Crevalle

Jack Crevalle

The crevalle jack is distinguishable from similar species by its deep body, fin coloration and a host of more detailed anatomical features including fin-ray and lateral line scale counts.  The dorsal-fin is in two parts, the first consisting of 8 spines and the second of 1 spine followed by 19 to 21 soft rays. The anal-fin consists of 2 anteriorly detached spines followed by 1 spine and 16 or 17 soft rays.  The upper jaw contains a series of strong outer canines with an inner band of smaller teeth, while the lower jaw contains a single row of teeth.  The crevalle jack's color ranges from brassy green to blue or bluish black dorsally, becoming silvery white or golden ventrally. A dark spot is present on the pectoral fin, with a similar dark to dusky spot present on the upper margin of the operculum. Juveniles have around five dark vertical bands on their sides, with these fading at adulthood.

The crevalle jack consumes a variety of small fish in addition to prawns, shrimps, crabs, molluscs and cephalopods.  Their eating habits appear to shift with age, location and season.  They reach sexual maturity at different lengths in males and females, with estimates suggesting males reaching maturity at approximately 22 inches and 4 to 5 years of age and females at approximately 26 inches and 5 to 6 years of age.  Spawning taking place year round.  

The crevalle jack lives in both inshore and offshore habitats to depths of around 1150 feet, with larger adults preferring the deeper waters.  In the inshore environment, crevalle jack inhabit shallow flats, sandy bays, beaches, sea grass beds, shallow reef complexes and lagoons.

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