Muro aji are warm-water swarms that swim in the middle and sometimes close to the bottom. Muro aji is often mixed with blue round trevally in the long area. The water layer is deep during the day, and it has a phototaxis habit at night. When the wind is calm, the tide is slow, and the southeasterly and southerly winds blow, Muro aji is easy to swarm at dawn or dusk, and the optimum temperature for swarming is 19-21°C. The juveniles are about 100 mm in length, and they live in symbiosis with jellyfish, jellyfish, and jellyfish.

The East China Sea Muro aji is divided into three groups: the northern group of Kyushu, the central group of the East China Sea and the southern group of the East China Sea. The Central East China Sea group appeared in the middle of the East China Sea from January to March. The spawning period was from January to May, and the peak period was from February to March. Some Muro aji groups may migrate to the western waters of Kyushu, and some migrate to the Yellow Sea to spawn The broodstock and juveniles feed and fatten near the spawning grounds, and return to the wintering grounds in the central East China Sea in late autumn.
In the larval and juvenile stage, small plankton such as copepods and cladocera krill larvae are the main bait. From juvenile to adult stage, except for krill, mysids, crustacean larvae, sardine larvae and other plankton. In addition to living things, there are also small fish and cephalopods. The feeding species of Muro aji were related to the dominant species of forage organisms in the sea area. The feeding intensity of Muro aji was highest in spring and autumn, medium in summer and lowest in winter.