First consider that it is caused by lack of oxygen. Fill new water or continuous rainfall, causing water quality changes, resulting in a large number of deaths of the original algae in the pond, resulting in a lack of oxygen at the bottom of the pond water, thus causing a large number of deaths of mussels. Water pollution caused by lack of oxygen, disease, poisoning, electrocution, etc. can lead to mussel death.

Because of the presence of a large number of parasites and pathogenic bacteria in the body of the mussels, as well as their own production of a large number of parasites (hooked mesoparasites larvae), so it is not recommended to keep mussels in the tank. Mussels are typical filter-feeding mollusks that filter out algae, zooplankton and organic debris from the water through a unique intake and drainage tube at the back of the body, which is used as food and discharged into clean water, thus realizing natural water purification. Relevant studies have pointed out that the water purification effect of mussels is quite good, can be filtered daily about 40-100 liters of water, known as a natural water purifier. Mussels are kept in aquariums and can replace filters in conjunction with water plants. However, mussels usually have many parasites in their bodies, and their reproduction also produces a large number of parasites (hookworm larvae), so mussels should not be raised in the tank, be sure to do a good job of disinfection and de-parasitization before entering the tank.