Yellowfin is widely distributed in Japan, North Korea, the Philippines, Indonesia and China's Taiwan, Fujian and Guangdong coast. The body has an elliptical shape, a side flat, and a pointed tip; the body surface is gray and yellow, and the body has several black vertical stripes and four oblique horizontal stripes. Pelvic fins, anal fins and caudal fins are yellow under the weight of 0.25 to 0.5 kg of adult fish and a few 1.5 to 2 kg of fish.
The source of broodstock is the sea area and artificial breeding. Males choose to lightly squeeze the body of the abdomen with milky white semen outflow. Females prefer the abdomen to expand and be soft. Move the selected male and female broodstock into the indoor pool cage.
Hatchery and nursery
Yellow fin eggs are buoyant isolated eggs, round transparent, egg diameter of 0.76 ~ 0.8 mm oil ball diameter of 0.22 ~ 0.23 mm. The proportion of 1.020 in seawater is buoyant, and below 1.012, it is immersed. The optimum temperature for egg hatching is 18ï½ž22Â°C at water temperature. Nursery ponds range from 10 to 50 cubic meters. 1 to 20,000 hatched larvae per cubic meter of water were released. Most of the larvae hatch on the third day of hatching. At this time, the rotifers are fed and the rotifer density is maintained at 4 to 1/ml. Cast rotifers twice a day and count rotifer density before feeding. Larvae were fed Artemia nauplii before and after the 23rd day of age, and the feeding density was 0.5/ml, which was supplemented with small copepods. Feed fish flesh before and after 40 days of age. It is better to change the water in a full day. In the early stage of raising seedlings, the water exchange volume is 10 to 50%, the medium-term 50 to 100%, and the later period is 100 to 300%.
At a water temperature of 17 to 22Â°C, juveniles generally have a total length of 13 mm around the age of 50 days and begin to metamorphose to juvenile fish. At this time, it can be held in the sea or raised in the earthen pond. After being raised for 1 month, juveniles have a total length of 2.5 to 30 mm and can be used as cages and earth ponds to raise seedlings. The fry caught in the sea is easily injured, and 1 to 2 ppm of nitrofurazone can be added to the water during transportation, which can play a role in disinfection.
Its breeding method is similar to that of real pansy. Yellow fins grow slowly, generally up to 350 to 400 grams in 2 years.
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