Parrotfish are covered with something like frost.

A layer of white frost on parrot fish is the external manifestation of water mold, which shows that parrot fish has water mold and needs timely treatment.

The occurrence of water mold is mainly due to the secondary infection caused by urgency of urination. The surface tissues of fish are only damaged by crowding, movement or other adverse environmental factors, and the swimming spores of Myxomycetes wait for opportunities to attach and start to germinate on necrotic tissues to form hyphae.

In addition to parasitizing on necrotic tissues, hyphae can also diffuse into nearby normal tissues, secrete digestive enzymes to decompose surrounding tissues, and then penetrate the dermis into muscles, so that skin and muscles are necrotic and disintegrated.

The hyphae on the surface extend outward, forming a covering like cotton wool, and forming sporangia at the end, releasing spores into the water and spreading everywhere through the water.

Extended data:

The causes of water model

First of all, seasonal problems.

It can be said that every seasonal alternation stage is a high incidence period of ornamental fish, so all fish friends must pay attention to it. Whether you buy fish or raise ornamental fish at home, you must observe and prevent it when the seasons alternate.

Second, high-density long-distance transportation.

This is also a reason for the high incidence of water mold in ornamental fish. First of all, the density of fish transportation is high, and collision with each other will cause trauma. In addition, the transportation time is long and the temperature is not constant. If the fish don't eat for a long time in the new environment, it will make the fish weak and the water mold will take advantage of it.

Third, the temperature difference is the reason why water is moldy.

When the fish is weak and the water temperature suddenly drops, many ornamental fish will break the water mold almost instantly, and the water mold is not like at first. Many fish friends can't tell by the state of the fish. When found, the mycelium has covered the fish, which is relatively troublesome to treat, and some particularly weak fish will die directly.