Swordfish got its name because it looks like a sharp knife. When we were young, we were called hairy fish, or hairy fish, which were migratory fish. Yangtze saury is in the sea in winter, goes upstream against the Yangtze River in spring, lays eggs in lakes in Anhui and Hubei, and small fish go out to sea along the Yangtze River and grow in the sea, and so on. When I lived in the sea, I was not famous. I swam back to fresh water. After I entered the lake through the river, the food chain changed slightly, the taste of fish gradually became fresh, and my value doubled.
Morphological characteristics of saury.
Long-jawed bonito is long and flat, with slightly higher side, tapering back, larger head, short and round kiss, large and oblique mouth, and serrated teeth on the lower edge of maxilla. The body is round and scaly, the abdomen has prismatic scales, and the lateral line is not obvious. There are 6 filiform free fins on the upper part of pectoral fin, and the dorsal fin and gluteal fin are 65,438+0 respectively. The caudal fin is undeveloped, the upper leaf is long and the lower leaf is short, which belongs to the secondary curved tail type and is small and open like a sharp knife.
The body color of bonito is silvery white, and its back is generally divided into three types: bluish gray, pale yellow and mixed bluish yellow. Fishermen call it "blue back", "yellow back" and "flower back". However, the Qiantang River, the Yellow River and the settled bonito have no distinction between "green back", "yellow back" and "flower back". The life span of bonito is not long, generally only 4~5 winter years old, and the largest individual is no more than 6 winter years old.