This kind of fish is spindle-shaped, with a big head, nose and mouth, big eyes and a big mouth. There is a layer of scales on the surface of their bodies, but this layer of scales is relatively small and not easy to be observed. The fish's back is bluish-black, dark, with some irregular dark blue spots on it, while its abdomen is light, yellow and white.
Judging from the living environment, mackerel belongs to marine fish, which is widely distributed in the Pacific Ocean, Indian Ocean and Atlantic Ocean. However, because this kind of fish belongs to warm water fish, that is to say, it has certain requirements for water temperature, so they are mainly distributed in low latitudes, and the number in high latitudes is relatively small.
Breeding mode of blue and white fish
The spawning depth of Sparus japonicus in the East China Sea of China is between 20 ~ 100 m, and the spawning temperature and salinity in different fishing grounds are slightly different. The general temperature is 15 ~ 2 1℃ and the salinity is 29 ~ 34.5 ‰. Oval and spherical, separated from each other, floating, colorless and transparent, with thin and smooth egg membrane and egg diameter of 0.93 ~1.15 mm. The yolk is uniform, transparent and colorless, with small periyolk gap. 1 oil ball, brownish, 0.26 ~ 0.30 mm in diameter ... After fertilization 12 hours, it reaches the blastocyst stage. 63 hours and 55 minutes after fertilization, the embryo body surrounds the yolk for more than one week, and the larvae are about to hatch.