North Sea redfish is American redfish.

American redfish, Sciaenops ocellatus (Linnaeus, 1766), also known as eye-spotted kingfish, red kingfish, red drum, black-spotted red bass, spotted tail bass, etc., belongs to the genus Perch Form order, Kingfish family, Kingfish genus. The body is spindle-shaped, similar in appearance to the domestic large yellow croaker. The body color above the abdomen of the adult fish is reddish. There are 1-4 round black spots above the base of the caudal peduncle of the juvenile fish, and the edge of the tail fin is blue.

Growth and reproduction

Red fish males can reach sexual maturity at age 4, and females at age 5 or above. Generally, broodstock for artificial breeding should be male fish over 4 years old and female fish over 5 years old, so that a large number of eggs can be obtained and the fertilization rate is high. The number of eggs carried by red fish is relatively large, generally between 5 and 2 million, and can reach more than 3 million. The eggs are released in batches. They can continue to lay eggs for a period of time. They are floating eggs with a diameter of 0.9-1.0mm. The membrane can be broken in about 24 hours at 23-25℃, and they will grow on yolk nutrition within 3 days after hatching.