In the initial stage, a faint bluish-white clouding of the edges of the fins and, in rare cases, the cornea of the eye appears in the fish. This is especially noticeable in small fish with transparent fins. Then the ends of the rays of the fins begin to fall away, the edges of the fins become disheveled. In juveniles, the caudal fin disappears completely. And finally, ulcers form at the bases of the destroyed fins, and the spinal column is exposed, after which the fish die.
White-skinned (Pseudomonas dermoalba)
The disease begins to appear through whitening of the skin around the dorsal fin and in the caudal region. A characteristic sign of the disease: the fish keeps near the surface of the water, often exposes the dorsal fin from the water. Color turns pale or yellowish (with red swordsmen). If untreated, fish die.
Fish tuberculosis, or Mycobacteriosis
Symptoms of this disease are very diverse. Common symptoms for all types of fish: first, a sick fish loses its appetite, becomes lethargic, loses weight, its color fades, fins collapse, scales fall out, sometimes there is a darkening of the iris of the eye, bulging eyes, open sores, black spots on the body. The listed signs can appear both singly and in combinations. The specific symptoms of the disease depend on the type of fish. In pecillia, sick fish keep isolated from others, stop eating, exhaustion occurs, which is outwardly characterized by the fact that the back bends, the abdomen retracts, the eyes fall in, bones protrude from under the skin and scales. In sick macro pods, the skin is damaged and red, the scales are lifted under the pressure of the fluid accumulated in the scaly pockets, and then it falls out, sometimes there is an eyesore, bulging eyes, after which blindness occurs, the body becomes covered with black dots. In males, the abdomen gradually increases, the skin begins to stretch and after 4-8 weeks it becomes transparent, apathy occurs in the fish, but they move in jerks, often on the side or belly up, stop eating. In zebrafish, an ocular comes on, and after some time the eyes fall out of the orbits, the abdomen gradually increases.
In diseased fish, ruffling of scales is observed. In the initial stage, the scales are raised only in a separate area of the body, then the irrigation extends to the whole body, the scales fall out and the fish dies. Irrigation of scales is also found in fish disease with tuberculosis and ichthyosporidmosis. The rise of the scales occurs as a result of the formation of a small bubble filled with liquid under it - pustules.
One or both eyes swell and protrude from the orbits. In extreme cases, the eye can literally "fall out" of orbit and get lost. Clouding of the entire outer surface of the eye is accompanied by exophthalmos or precedes it. If exophthalmos is associated with a systemic infection (see below), then at the same time there may be signs of this infection - for example, bloating.