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THE REBATTER
Copepods Lernaea cyprinacea and Lernaea elegans. The disease is caused by the defeat of the skin of fish by female crustaceans. The length of the body is 12-15 mm (Lernaea cyprinacea) and 6-12 mm (Lernaea elegans). On the head there are branched outgrowths, with the help of which the crustaceans penetrate into the skin of the fish. The crustaceans have five pairs of pair swimming legs, with which they move in the water column, two egg-shaped bags, each of which can contain up to 700 eggs.

BIOLOGY
The embryo in the egg develops best at a temperature of 23-30 degrees. The nauplius hatch after four days after laying eggs. Being subjected to complex metamorphosis, they, in the end, turn into adult crustaceans. Males after intercourse die, and females, penetrating the skin of the fish, are fixed in the muscles and remain in this position permanently.

SYMPTOMS AND PATHOGENESIS
In places of penetration of crustaceans, muscle processes begin in the fecal processes, which lead to the formation of deep ulcers, which have bright red at the edges, and less often grayish. Various microbes settle in the wound (an abscess develops). Inflammation extends to the surface layers. In places of ulcers, fish scales rise under the pressure of liquid accumulated in scales pockets. Parasites secrete toxins that lead to an increase in the content of phagocytic elements in the blood.

DIAGNOSIS
The disease is diagnosed on the basis of symptoms and after the detection of crustaceans.

TREATMENT
The caught sick fish are placed in a separate vessel. The aquarium, where they were, is freed from water, disinfected, and poured with fresh, settled water. In both vessels 0.2-0.3 g of levomycetin per 10 liters of water is added.
Baths:

• 100 mg of chlorophos per 1 liter of water, aging for 60 minutes;
• 200 mg potassium permanganate for 10 liters of water, aging for 40 minutes.