The body of the Indian mackerel is moderately deep, and the head is longer than the body depth. The maxilla are partly concealed, covered by the lacrimal bone, but extend till around the hind margin of the eye.These fish have thin dark longitudinal bands on the upper part of the body, which may be golden on fresh specimens. There is also a black spot on the body near the lower margin of the pectoral fin. Dorsal fins are yellowish with black tips, while the caudal and pectoral fins are yellowish. The remaining fins are dusky.Indian mackerel reach a maximum fork length of 35 centimetres (14 in), but are generally around 25 centimetres (9.8 in) in length. The spawning season around India, which is in the northern hemisphere, is between March and September. Around Seychelles in the southern hemisphere, it is between September and the following March.Spawning occurs in batches. The eggs are laid in the water and are externally fertilized. The Indian mackerel do not guard their eggs, which are left to develop on their own.Juveniles feed on phytoplankton like diatoms and small zooplankton including cladocerans and ostracods. As they mature, their intestines shorten, and their diet changes to primarily include macroplankton such as the larvae of shrimp and fish.