Pseudosciaena crocea: It is nearly rectangular in shape and has a flat side, with a body length of about 30 cm, a large head with a flat side, a blunt snout, a wide and slightly convex eye interval, tiny serrations at the edge of the anterior branchial cover, a flat spine at the rear end of the branchial cover, and a grayish yellow back. Small yellow croaker: The shape is similar to that of large yellow croaker, but smaller, with a body length of about 20 cm. The starting point of dorsal fin corresponds to the starting point of pectoral fin, and the ventral fin is slightly shorter than pectoral fin, with grayish brown on the back, yellow on both sides and ventral side, and grayish brown on the edge of dorsal fin.

1. What's the difference between big yellow croaker and small yellow croaker?

1, different morphological characteristics

(1) The body of Pseudosciaena crocea is elongated, laterally flat, with multiple rows of luminous particles on the ventral surface of the body. It is nearly rectangular and laterally flat, with a body length of about 30 cm, a large and laterally flat head, a blunt snout, a wide and slightly convex eye interval, tiny serrations on the edge of the anterior branchial lid bone, a flat spine at the rear end of the branchial lid bone, and a gray-yellow dorsal body. The head is all squashed except the back of the top of the head.

(2) The body of the small yellow croaker is elongated, flat on its side, with multiple rows of luminous particles on its side and abdomen, similar in shape to that of the large yellow croaker but smaller, with a body length of about 20 cm, the starting point of dorsal fin corresponding to that of pectoral fin, the ventral fin is slightly shorter than pectoral fin, its back side is grayish brown, its sides and ventral side are yellow, its dorsal fin edge is grayish brown, its head and front side are rounded, and its back side is covered with comb scales, dorsal fin soft strips and buttocks.

2, the distribution range is different.

Pseudosciaena crocea is distributed in the northwest Pacific region, including Japan, China, the coastal areas of Vietnam and South Korea, and in China, it is distributed in the southern Yellow Sea and the East China Sea. Small yellow croaker is distributed in the Pacific Northwest, including the coastal areas of China, North Korea and South Korea, in China, in the Bohai Sea, the East China Sea and the southern Yellow Sea, and in the East China Sea in winter, with the southern boundary of about 26? The east boundary is about east longitude 126? 30? .

3, the taste is different

Because of its large size, large yellow croaker has more meat and relatively thick meat. The meat quality of small yellow croaker is much more delicate, but there are more fishbones.

Second, the breeding mode of large yellow croaker

1 There are many spawning grounds for Pseudosciaena crocea, with the largest spawning grounds in China coastal areas, such as Lusiyang in Jiangsu and Daiquyang in Xijiang. The water depth of spawning grounds in the East China Sea and the Yellow Sea is generally less than 20m. In the spawning grounds of Lusiyang in spring season, when the water temperature rises to 15- 17℃, it begins to spawn in groups, and at 2/2. The individual fecundity of Pseudosciaena crocea is usually10-10,000,000, which produces separated floating eggs. The fertilized eggs hatch at 20℃ for about 33 hours.

2. The spawning period of Pseudosciaena crocea is divided into spring and autumn, with the East China Sea and the South Yellow Sea mainly in spring and the South China Sea mainly in autumn. Large yellow croaker can lay eggs many times in its life, and generally ovulate 2-3 times in the reproductive period. The amount of eggs conceived is directly proportional to the individual size, which is generally 200,000-500,000. The egg is spherical, the egg is buoyant, the egg diameter is 1.2- 1.6 mm, the egg membrane is smooth, there is a colorless oil ball, and the fertilized egg is at the water temperature of/kloc-0.