Yellow croaker can be divided into large yellow croaker and small yellow croaker. The large yellow croaker is distributed in the southern Yellow Sea, the East China Sea and the South China Sea. It usually inhabits deep-sea areas, migrates to the offshore from April to June and lays eggs. After laying eggs, it is scattered along the coast to seek bait, and then migrates to deep-sea areas in autumn and winter.

Small yellow croaker is distributed in the Yellow Sea, Bohai Sea, East China Sea and the west coast of North Korea. It migrates to the coast in spring, and after spawning in March to June, it scatters in the offshore for feeding, returns to the deep sea in late autumn and overwinters in the deep sea in winter. Yellow croaker generally has a mixed diet, mainly feeding on fish and shrimp.

Growth habit

Pseudosciaena crocea is a warm-water group migratory fish, and its adaptation range to water temperature is 8~32℃, and its optimum growth temperature is 18~28℃. When the water temperature dropped from high temperature to 17℃, the food intake began to decrease, and when it continued to drop to 15℃, the food intake was only 50%~55% of the normal amount. When the water temperature drops to 1 1.5℃, the feeding activity is slow, and the food intake is only in the constant range of 10%~ 12% at noon or afternoon with sunshine.

Pseudosciaena crocea requires high dissolved oxygen in the living water environment. When the dissolved oxygen in water is above 7.0mg/L, the growth and daily food intake of Pseudosciaena crocea are normal. Daily activities are in the middle and lower layers of the cage. When the dissolved oxygen in the aquaculture water environment drops to 4mg/L, the daily activities of Pseudosciaena crocea are in the middle and upper layers of the cage, and they swim by the net in groups, so the food intake decreases accordingly.

When the dissolved oxygen decreased to 3mg/L, large yellow croakers swam around the net in groups, and their heads jumped up, and then their bellies turned up on the water. After 2~3 hours, some fish died of hypoxia.