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What's the difference between small yellow croaker and large yellow croaker?
Yellow croaker can be divided into Pseudosciaena crocea and Pseudosciaena crocea, both of which belong to Fish, Perciformes, Sciaenidae and Pseudosciaena crocea.

The body of Pseudosciaena crocea is nearly rectangular, with flat side, and the rear edge and abdominal edge are convex and low. It is about 30 cm long. The head is big and flat, and the kiss is round and blunt. The eyes are equal in size and superior in side; The eye spacing is wide and slightly convex. There are two nostrils on each side, the front nostril is round and small, and the back nostril is long and big, close to the eyes. The front of the mouth is wide and inclined. The upper and lower jaws are equal, and the lips are thin; The maxilla can bend. There are fine serrations at the edge of the anterior branchial cover bone, and flat spines at the back end of the branchial cover bone. The gill aperture is large, and the gill cover is not connected with the isthmus. Gill harrow is longer. Scales comb-shaped, lateral shallow scales 57; The scale under the lateral line is greater than the scale on the lateral line. More than 2/3 of dorsal fin and gluteal fin are covered with small round scales. The front of the lateral line is curved and the back is straight. Dorsal fin ⅷ ~ ⅹ 3 1, the starting point is above the starting point of pectoral fin. Gluteal fin Ⅱ 9, starting from the middle of dorsal fin strip, pectoral fin 15, starting from the back of branchial lid. The ventral fin is smaller than the pectoral fin. Tail fin wedge. The back of the body is grayish yellow, and the underside is golden yellow; The dorsal fin and caudal fin are grayish yellow, and the pectoral fin, ventral fin and gluteal fin are yellow. Most of them are active in the lower layers of seawater and have migratory habits.

Small yellow croaker, similar in appearance and smaller in size. The body length is about 20 cm. Sideline scale 60 ~ 63. Dorsal fin ⅸ 34 ~ 36, the starting point is opposite to the starting point of pectoral fin. The gluteal fin Ⅱ 9 begins in the middle of dorsal fin zone. Pectoral fin 19, long and sharp, with the end exceeding the ventral fin. The ventral fin is slightly shorter than the pectoral fin. Tail fin wedge. The back of the body is grayish brown, the side and abdomen are yellow, and the edge of the dorsal fin is grayish brown. Have migration habits.

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