1, shark

The most dangerous marine fish is the shark, which is bigger and faster. Its skeleton is cartilage. Although its bones will calcify, it has no real bone tissue. Sharks have underdeveloped exoskeletons and diverse teeth. Because there are many varieties, they are different in size, big and small.

Step 2: hairtail

Hairtail is fierce, its body is silver gray, but its tail is black, and its length is generally around 1 m. Mainly distributed in the western Pacific Ocean and Indian Ocean, it is one of the main seafood products in China. Hairtail has poor swimming ability. Floating on the sea during the day and falling to the bottom of the sea at night.

3.grouper

Grouper is a large and medium-sized warm-water fish, which is generally distributed in tropical and subtropical waters. There are many kinds of groupers, which generally inhabit near coral reefs. As a solitary fish, groupers only swim in groups during the breeding season. This fish also has the ability to change sex. It is a female when it matures for the first time, and it will become a male after one year of reproduction.

4. Salmon

Salmon, also known as salmon, is a cold-water migratory fish that spawns upstream, mainly distributed in the North Pacific Ocean and the Arctic Ocean. This kind of fish is about 60 cm long and will migrate during the breeding period. After entering the freshwater basin, they will stop eating and lay eggs and die.

5. Tuna

Tuna is a large ocean-going commercial food fish, which is called tuna in Hong Kong and sub-winter fish in Macau. Tuna is mainly distributed in the Indian Ocean, the central Pacific Ocean and the central Atlantic Ocean, and belongs to tropical and subtropical oceanic fish. There are 8 species of tuna, most of which are huge. The largest species can reach 3.5 meters in length and weigh 600-700 kilograms, while the smallest species weighs only 3 kilograms.