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Black? Also known as Blackfish, Black Rock, Black Walled. Located in the western part of the North Pacific Ocean, China is home to Huang, Dong, and the East China Sea. The northern coast is visible all year round. The meat is tender, white, and has less fat and soft and hard taste, especially suitable for steaming and soup. Fast growth, good adaptability, is a good type of cage culture. Black body extended, flat side. The body length is generally 20 to 30 cm and the weight is 100 to 300 grams. The kiss is more pointed and the jaw is longer than the upper jaw. Eyes big, high. A dorsal fin with a nick in the middle, with 13 fin spines and 12 soft bars. Caudal fins rounded. Body is finely rounded. Gray and brown on the back and sides, with irregular black markings. Chest and belly gray. The dorsal fins are dark yellow and the rest of the fins are grayish black. The fish is a cold, algae-dwelling fish that prefers to inhabit shallow reefs or algae clumps. Do not like light. In spring and autumn, small groups can be formed for short distance travel. More resistant to low temperature, suitable temperature range of 8 ~ 25 °C, 14 ~ 22 °C fastest growing. The feeding was stopped at 5-6°C and the lethal temperature was 1°C. Black is a carnivorous fish and it is a swimming feeding. Very gluttony, large food intake, high stomach fullness. The daily food intake of younger fish can reach 7.5% of body weight, and the amount of satiety is about 11%. Faster growth, artificial seed breeding up to 250 grams in the second year, the third year of 600 to 800 grams / tail. The life span is generally 5 to 8 years. The maximum body length is 50 centimeters and the weight is more than 10 kilograms. It grows quickly before the 5th instar, declines after the 5th instar, and decreases after the 8th instar. The breeding age ranged from 3 to 14 years, with males predominating in 3 to 4 instar fish, and females predominating in 5 to 7 instars. Coastal littering season in Shandong is from April to May, and the peak period is from May to mid-May. At the beginning of reproduction, the water temperature is about 11°C and the peak period is 13-16°C. Usually near shore. There are reefs outside the inner bay where there are reefs and fresh water. Oviparous, larvae can swim freely when the mother produces.