How to read bonito:

Bonito:

Bonito is a fish of the genus Bonito in the family Scombroidae of the order Perciformes. The body is stout and fusiform; the caudal peduncle is thin, with a well-developed central crest; the head is large and conical; the muzzle is pointed; the eyes are equal in size and laterally superior, near the muzzle end, and the interocular septum is wide; the mouth is large, and the posterior end of the maxilla reaches to the lower part in front of the pupil, and both maxillae are armed with a row of small conical teeth; the anterior gill cover bones and the edges of the gill cover bones are rounded and smooth; the body, except for the pectoral armor, which has large scales, is bare and scale-less; the dorsal fins are very close to each other; the pectoral fins are short, and slightly triangular; the ventral fin is small caudal fin crescent-shaped.

The dorsum of the body is blue-brown, the abdomen is silver-white, and there are 4-6 brown longitudinal bands on the lower part of the side of the body. The bonito is found in tropical and subtropical waters of the Pacific, Indian and Atlantic Oceans, and in China in the South China Sea and Taiwan waters. It rests in warm waters with a water temperature of 15-25 degrees Celsius, and often clusters in the radiation zone where cold and warm water masses meet and in sea areas where the water quality is clarified. It swims rapidly, appearing in the surface to 260 meters during the day and surfacing at night. Feeds on fish, crustaceans and mollusks.

Expanded Knowledge:

There are already sexually mature individuals at the age of 3, and all of them have reached sexual maturity. The spawning period varies with the habitat, spawning throughout the year in tropical waters, spawning in the subtropics in late spring and early fall before. Eggs are buoyant. The skipjack tuna is an important part of the world's tuna species. When it gets excited, such as chasing prey or males pursuing females, the direction of the stripes will change from vertical stripes from the head to the tail to horizontal stripes extending from the back to the abdomen;

When it calms down, the horizontal stripes will change to vertical stripes again; once it is dead, the color of the original vertical stripes will obviously turn black. The reason for the change in the direction of the stripes is still unknown. Dorsal fins 2, close together; first dorsal fin consists of weak fin spines, anterior fin spines are higher than the posterior fin spines, the first and second fin spines are the longest, about half the length of the head, the rest of the spines are gradually shorter backward, and the spines can be folded in the dorsal groove when lying down; the second dorsal fin is small, and its starting point is nearer to the starting point of the first dorsal fin than to the caudal fin base, and it has 8 separated finlets in the back.