Symptoms of fish egg diatoms and control techniques, prevention and control techniques

Overview: Egg-disease is an infectious fish disease, also known as powdering disease, white scale disease.

Symptoms: During the initial stage of the disease, the mucus in the surface of the diseased fish increases, and the dorsal fin, caudal fin, and body surface appear white spots. The white spots gradually spread to the caudal peduncle, head, and iliac crest. At a glance, the symptoms were similar to those of the small melon worm. After careful observation, there were red blood spots between the white spots. Microscopic examination of the white spot, M. difficile is not moving, and there is a clear difference with the small melon. In the later stages, the diseased fish stayed on the surface of the water, or clustered in water, and the white spots on the body were connected into pieces, like a layer of white powder. In the end, the sick fish were thin and dead.

Pathogens: Parasitic acidophilic dinoflagellates, algae kidney-shaped, wider than long, wide 102-155 microns, length 83-130 microns. The main hazards of goldfish are most severe from late spring to autumn, and the disease usually occurs when the acidic pool water has a hydrogen ion concentration of 316.3-10000 mlol/(PH5-6.5) and the water temperature is 22-32°C. The goldfish are stocked too densely and lack animal live food. The condition is even worse.

Control methods: Use borax 10-25ppm, quicklime 5-20ppm to sprinkle the whole pool, so that the pool of hydrogen ion concentration is adjusted within 100nmol / L (that is, PH7 or more), can make acidophilic dinoflagellate off. The diseased fish was transferred to a tank or a cistern with alkaline water, and the diseased fish recovered quickly.

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