Black herring is mainly distributed in the plain area south of the Yangtze River in China, but it is rare in the north of the Yangtze River. It is an important fishery resource in the middle and lower reaches of the Yangtze River and lakes along the Yangtze River, and is the main breeding object of lakes and ponds. It is one of the four largest freshwater fish in China.

The dorsal fin and the anal fin have no hard spines, and the dorsal fin is opposite to the ventral fin. The back and upper body are blue-black, the abdomen is gray-white, and all fins are gray-black. Usually, they live in the middle and lower layers of large waters, and there are many snails at the bottom. Their food is mainly snails, mussels, clams and so on. They also prey on shrimp and insect larvae.

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Precautions:

1. When eating stewed herring or herring food, it is not advisable to eat plums, and it is not advisable to eat food fried in beef and sheep oil (herring should not be cooked with these two oils).

2. Because herring bile is toxic, it is not suitable for abuse. Excessive swallowing of herring gallbladder can lead to poisoning. After half an hour, the mild person will have symptoms such as nausea, vomiting, abdominal pain and watery stool. In severe cases, there will be unconsciousness, oliguria, anuria, blurred vision, yellow sclera after diarrhea, followed by commotion, convulsions, clenched teeth, stiff limbs, foaming at the mouth, eyes turned up and shortness of breath. If the treatment is not timely, it will lead to death.

3, many users especially like to eat fish heads, especially here, fish heads are not inedible, but eat less, because fish heads contain the most mercury.

4. In all parts of a fish, the mercury content of fish eggs is the lowest, and some smaller fish have almost no mercury content, so don't drop fish eggs when eating fish.

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