Pay attention to the density and water quality of grass carp, and put more grass that grass carp likes to eat. The density of fish should not be too high, and it is easy to lack oxygen. The water quality should be thin, light green or khaki, and many underwater plants should release oxygen. 1February is the season of high incidence of grass carp diseases, so pay attention to eat less and try not to leave leftover grass in the pond to avoid bacterial infection of grass carp.