There are many kinds of marine fish, such as shark, hairtail, grouper, salmon, tuna, cod, salmon, eel, perch, pomfret and so on. 1, Shark: It is a highly dangerous marine fish with large size, fast speed, calcified bones and diverse teeth. 2, hairtail: fierce temperament, silver-gray body, the length is generally about 1 meter. 3. Grouper: It belongs to warm-water large and medium-sized fish, with many kinds, and generally inhabits near coral reefs.

First, what are the common marine fish?

1 There are many kinds of common marine fish, such as shark, cod, salmon, salmon, eel, perch, grouper and pomfret. These fish mainly live in the ocean, but their waters are different. The fish living on the surface can't swim too deep, and the fish living in the deep sea can't reach the upper water. Some fish have migratory characteristics and will swim to fresh water to lay eggs in the breeding season.

2. When raising marine fish, you must first prepare a large fish tank, and then transplant some plants such as algae and corals into the fish tank. When raising marine fish, it is necessary to raise seawater first. If the seawater is not well raised, it will make it difficult for marine fish to survive. At the same time, the nitrification system and filtration system must be established, which is the most important step.

3. Generally, the amount of organic nitrogen waste and ammonia produced by farmed fish will be relatively large, and these organic nitrogen will be rapidly decomposed by heterotrophic bacteria to produce highly toxic ammonia, which will harm the organisms in the whole water body. Therefore, when cultivating marine fish, a nitrification system must be established.

Second, common pictures and varieties of marine fish

1 shark

The most dangerous marine fish is the shark, which is relatively large and fast. Its skeleton is cartilage. Although its skeleton will calcify, it has no real bone tissue. Shark exoskeleton is underdeveloped, and its teeth are diverse. Because of its variety, its body shape is different, big and small.

2. Hairtail

Hairtail is very fierce, its body is silvery gray, but its tail is black, and its length is generally around 1 m. It is mainly distributed in the western Pacific Ocean and the Indian Ocean, and is one of the main seafood products in China. Hairtail's swimming ability is poor. It floats on the surface of the sea during the day and falls to the bottom of the sea at night.

3. Grouper

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

4. Salmon

Salmon, also known as salmon, is a cold-water migratory fish that spawns upstream, mainly distributed in the back of the 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 die after laying eggs.

5. Tuna

Tuna is a large ocean-going commercial edible fish, which is called tuna in Hong Kong and sub-winter fish in Portuguese in Macao. 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.

6. Cod

Cod is one of the fish with the largest annual catch in the world, which has very important edible and economic value. Pure cod refers to cod, which is mainly divided into Atlantic cod, Greenland cod and Pacific cod. Usually, the concept of cod will be extended to cod, with more than 50 species, most of which are distributed in the continental shelf of the northern Atlantic Ocean. The more important species are haddock, blue cod, green cod, toothfish, Norwegian long-arm cod and pollock.