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Introduction of yellow croaker
作者:Administrator    发布于:2018-08-22 10:27:47    文字:【】【】【
         Yellow croaker, Larimichthys (D.S. Jordan et Starks, 1905), also known as yellow croaker, a genera of yellow croaker of the family Scombophilaceae. Born in the East China Sea, there are two hard stones in the head of fish, called fish brain stone. The fish swimming bladder in fish belly can be used as gelatin, which has the effect of stopping bleeding and can prevent hemorrhagic purpura.

         Yellow croaker is divided into Pseudosciaena crocea and Psendosciaena polyactis, which are one of the four major marine species in China. Big yellow croaker is also called big first, golden dragon, cucumber fish, red melon, golden dragon, sweet-scented osmanthus yellow croaker, big king fish, big yellow jaw; small yellow croaker is also called plum, plum, small king fish, small first, small spring fish, small cucumber fish, thick scale larvae, flower fish. They are all attached to the teleost, pisceform, croaker, and yellow croaker.

         Yellow croaker was once one of the most important economic fishes in China. It is a endemic species in China. It is widely distributed in the southern part of the Yellow Sea from the north, through the East China Sea, Taiwan Strait, and south to the east of Leizhou Peninsula in the South China Sea. The fish is a warm warm clustered swimming fish, often inhabiting in the middle and lower reaches of the ocean within 60 meters deep. The reproductive season of large yellow croaker is spring and autumn. During the reproductive season, the fish flocks migrate in batches from the overwintering area off the sea to the offshore for reproductive migration. As a valuable economic fish, Pseudosciaena crocea has been favored by consumers for a long time. But due to overfishing, resources are severely damaged.
Pseudosciaena crocea is nearly rectangular and flat, with the anterior protuberance of the dorsal margin and ventral margin and low rear. The length is about 30 cm. The head is big and flat, and the kiss is blunt. Eyes large, lateral upper; ocular septum wider and slightly convex. The nostrils are 2 on each side, the front nostrils are round and small, and the posterior nostrils are long, large, close to the eye. The front is wide and slanting. The upper jaw and the lower jaw are equal, the lips are thin, and the maxilla is telescopic. The margin of the anterior operculum is serrated, with a flat spine at the back end of the operculum. The gill pore is large, and the operculum is not connected with the isthmus. Gill rakes are longer. Scales scallate, lateral superficial scales 57; lateral line scales larger than lateral scales. The fins of dorsal fin and anal fin are smaller than 2/3. The front line is more curved and the rear is straight. The dorsal fin is from VIII to 31, and its origin is above the origin of pectoral fins. The anal fin is 9, the origin is about the middle part of the dorsal fin fin, the pectoral fin is 15, and the starting point is behind the gill cover. The pelvic fins are smaller than pectoral fins. Caudal fin cuneiform. The dorsal part of the body is gray-yellow, the lower part is golden; the dorsal and caudal fins are gray-yellow, and the pectoral, ventral and gluteal fins are yellow. More active in the lower layer of the sea, there are migratory habits. Small yellow croaker, similar to small yellow croaker, is small. The length is about 20 centimeters. Lateral line scale 60~63. The dorsal fin is 34~36, and the starting point is relative to the starting point of pectoral fins. Anal fin 9, starting from the middle part of dorsal fin fins. Pectoral fin 19, long and pointed, terminal over the pelvic fins. Pelvic fins shorter than pectoral fins. Caudal fin cuneiform. The body is gray brown with both sides and ventral sides yellow and dorsal fin gray brown. There are migratory habits.

      In spring, the water temperature in the coastal waters of China increased, and the fish migrating from the overwintering area to the shallow sea area near the coastal estuary. The overwintering sea areas of the northern and central groups of the East China Sea are the wintering ground outside the Yangtze River and the boat, the wintering ground near the coast of Zhejiang and Fujian, and the wintering ground outside the sand and sand. In mid and late April, the parent fish swarm westward from the Deepwater wintering area into Lusi, Daiqu, Damo and other spawning grounds. The spawning period is 5~6 months. After the spawning, the parent fish are dispersed in the islands and estuaries. In September, there were smaller fishes to spawn near Jiangsu and Zhejiang to form the autumn flood season. In the late autumn and early winter, the temperature of the coastal waters decreased and the large yellow croaker returned to the overwintering sea area. The northern populations of the Fujian and Guangdong groups lay eggs mainly in the fishing grounds of the eastern Fujian, one way from late April to mid May, and the other way from April to mid May.


      From late ten days to mid-June, 3-4 batches of the White Dog Islands and Mazu Islands entered Sandu Bay and spawned in Guanjing Ocean every high tide from mid-May to mid-June. In the late autumn and early winter, the fish scattered around the bait began to form the autumn and winter Rhubarb in the four islands. Since then, as the water temperature drops, some of the fish swim to 60 meters of isothermal water overwintering, some continue to swim to the south of the four islands. The reproductive migration of the southern groups of Fujian and Guangdong began early in the coastal waters east of the Pearl River Estuary. In January, the fish began to concentrate from the outer sea to Shanwei and migrate to the northeast. From February to March, they arrived at Jiazi and Shenquan. In March, the fishing flood was formed in the northeastern fishing grounds of Nanao Island and the southeastern fishing grounds, and ended in April. The autumn flood began in August, and the fish from the southern coast of Fujian Province into the coast of Guangdong, from the northeast to southwest migration. It arrived in Raoping coastal waters in September and the southwestern coast of Nanao Island. It appeared in Shenquan and Jiazi in October. It arrived in Shanwei in November. It was near Pinghai and Aotou (inside and outside Daya Bay) in December. It began to disperse to the sea in January. In early October, the western Guangdong group swam from Wuchuan and other nearby areas to the South and North spawning grounds of the Chaozhou Island. In November, the spawning season was full. After spawning, the western Guangdong group divided into small groups and turned to Deep-water habitat. The autumn flood ended. The spring flood in the following year began to gather in the south of the island in February for spawning. It was a flood in March and the water temperature rose in early April. During the spring rainy season, the salinity of the shallow water in the coastal estuary decreased significantly, so it was not suitable for the large yellow croaker to inhabit. The fish fled quickly and the spring flood ended.
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