I just caught some small crabs at the seaside. What should I feed them? Do they eat freshwater fish?

Crabs are omnivores. If possible, feed live red nematodes or egg yolk. Pay attention to feeding and finish it in half an hour. If you can't eat it, it will make the water dirty. Sea crabs can be fed to the viscera of chickens, ducks or small fish and shrimp, and raw fish and dried fish are acceptable. You can also feed them fish feed, such as red worms, shrimps, snails, mussels and so on. It is best to feed some grass foods frequently, such as Sophora alopecuroides and Elodea.

A small number of crabs grow and breed completely in fresh water, and most of them live under rocks in mountain streams. There are also a few crabs, such as ground crabs, which can adapt to land life, make holes in wet mud holes and migrate to the sea when breeding. Most crabs are omnivorous. Some crabs are carnivorous. For example, Portunus can prey on fish, shrimp and mollusks. A few crabs, such as window crabs, scrape or filter algae and organic debris.

Extended data:

Crab breeding management, strengthen daily feeding management, and implement daily inspections. Patrol at least 1 ~ 2 times a day, once in the morning and once in the evening, and pay attention to the feeding situation of river crabs. In case of abnormal conditions, it is necessary to immediately check whether there is any disease, and actively use drugs to prevent the spread of infectious diseases from affecting the breeding efficiency.

With the increase of the number of aquaculture, water hypoxia happens from time to time, so it is necessary to change water and increase oxygen in time to reduce the high mortality caused by hypoxia. In addition, it is necessary to check whether there are any loopholes in the pond, do a good job of blocking and preventing the invasion of natural enemies, and avoid the situation of escape.

The disinfection management of crabs can eliminate germs and bacteria in ponds and create a good breeding environment for the healthy breeding of river crabs. Disinfection management of ponds should be done well before and after breeding. When young crabs enter tang qian, they should be disinfected in advance, and the mud in the pond should be cleaned in time in winter. In the process of aquaculture management, the disinfectant selected should be low in toxicity and quick in volatility to avoid environmental damage caused by disinfection.