JACKS
CARANGIDAE
Bigeye Scad
Aelar crumenophthalmus
    Ecological Descriptors
Habitat Size (cm) Diet Behaviour Sex 
Pel 27 Pla Sh, F
 
 
Description:
Large eye is greater than snout length. Bright reflective silver, but  lacking obvious large scales and narrow caudal peduncle (cf herring spp). Scutes only on thee rear of lateral line. Deeply forked tail.

Ecology
Occurs in large inshore schools, usually in shallow waters. It also occurs over shallow reefs or in turbid water. Maximum size is to 27 cm. The species feeds mostly at night on large planktonic animals; juveniles feed mostly on crustaceans (euphasiids, decapods) and adults are active predators of fish larvae and early juveniles. Its large eyes could be an adaptation to night predation

Life Cycle:
Size at maturity is <20 cm. Females spawn every three days. Mean batch fecundities are ~92,000. Few survive longer than one year (~21cm). Sex ratio remained constant month to month and sexual maturity is attained at 21.5 cm FL. Spawning periods are potentially staggered from April to November, with a peak from September to November. Some studies indicate that the spawning period for this species extends over a period of 6-7 months (between March and September). Its life cycle is rapid and short.
Bigeye Scad
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Bigeye Scad