1. Choose fresh crucian carp: fresh crucian carp has a light smell and a good taste. If you buy stale crucian carp, the cooked soup is easy to smell fishy.

2. Blanch the crucian carp before cooking: Blanch the crucian carp in boiling water and cook it, then take it out and put it in the pot, which can effectively remove some fishy smell.

3. Add ginger, cooking wine and coriander: Adding some ginger slices, cooking wine and coriander to the water for cooking crucian carp soup can effectively remove the fishy smell. Among them, cooking wine can help to remove fishy smell, ginger can remove fishy smell and improve the taste of soup, and coriander can neutralize fishy smell.

4. Add ingredients: When cooking crucian carp soup, you can add some ingredients, such as medlar, red dates, yam, black fungus and so on. These ingredients can increase the taste and nutrition of the soup and neutralize the fishy smell.

5. The cooking time should not be too long: the cooking time of crucian carp soup should not be too long, so as not to cook too much fishy smell. Generally speaking, the cooking time of crucian carp soup is 30-45 minutes.

6. Crucian carp must be cleaned up after slaughter, and there must be no black film in the fish cavity, because the fishy smell contained in the black film is the heaviest. If the fish stall owner didn't scrape and wash the fish when he slaughtered it, he should do it himself when he went home to clean it up.

7. Crucian carp should be marinated before frying: marinating with cooking wine, onion ginger and pepper can enhance the fragrance and smell.

8. When frying crucian carp, don't cover the pot immediately: don't cover the pot immediately when you just start stewing with boiling water. Covering the lid will make the fishy smell released by crucian carp in the process of stewing unable to dissipate with the hot air, resulting in the fishy smell still remaining in the pot. Cover the pot directly and simmer for 5 minutes, then cover the pot and continue to stew until the soup is milky white.

Generally speaking, cooking crucian carp soup needs to pay attention to freshness, blanch to remove fishy smell, add ginger, cooking wine and coriander, and add ingredients appropriately, so as to cook crucian carp soup without fishy smell.