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Common Koi Disease Treatment – Indigestion (Food Injury)
During the day when water temperatures are relatively high, koi may feed aggressively. However, if temperatures drop sharply at night due to sudden weather changes or rainstorms, the rapid decline in water temperature disrupts the normal functioning of their digestive system, leading to indigestion (i.e., digestive disorder). (1) Symptoms: In...
Common Koi Disease Treatment – Cold
(1) Symptoms: The skin and fins of the affected koi lose their original luster, becoming dull in color. A grayish-white film-like substance appears on the body surface, and the fin rays adhere together, preventing them from spreading open. (2) Preventive Measures: During water changes and in winter, pay attention to...
Common Koi Disease Treatment – Mechanical Injury
Mechanical injury refers to discomfort or even death in koi caused by squeezing, collisions, friction, or severe vibrations. (1) Preventive Measures: Improve fishing gear and containers to minimize capture and handling. Exercise caution during capture and handling, and choose appropriate timings for these activities. The substrate of outdoor overwintering ponds...
Common Koi Disease Treatment – Argulosis (Fish Louse Disease)
(1) Symptoms: The parasites attach to the fish's fins. Infected fish often rub their bodies against the pond bottom or gather in corners of the pond, and may die from complications due to physical weakness. (2) Preventive Measures: Add 100 kg of distiller's grains per mu (per meter of water...
Common Koi Disease Treatment – Lernaeosis (Anchor Worm Disease)
(1) Symptoms: The parasite's head burrows into the skin, muscles, fins, or mouth of the koi to feed. The affected areas become inflamed, swollen, and develop red patches or necrosis. (2) Preventive Measures: Apply 125 kg of distiller's grains per mu (per meter of water depth) to the pond. Use...
Common Koi Disease Treatment – Dactylogyriasis (Gill Fluke Disease)
(1) Symptoms: Dactylogyrus parasites attach to the fish's gills, causing the gill covers to remain open and difficult to close. The gill filaments appear grayish or pale. (2) Preventive Measures: Use a heater to raise and maintain the water temperature at 25°C or above. (3) Treatment Methods: Crystalline Trichlorfon Treatment:...
Common Koi Disease Treatment – Gyrodactyliasis (Three-Generation Worm Disease)
(1) Symptoms: Affected fish become emaciated and display extreme restlessness in the early stages, alternating between frantic swimming in the water and sharp lateral movements. They may also rub against aquatic plants or tank walls. As the condition worsens, the fish gradually lose weight, eventually leading to mass mortality. (2)...
Common Koi Disease Treatment – Trichodiniasis (Wheelworm Disease)
(1) Symptoms: Trichodina primarily parasitizes the gills and body surface of fish, but can also attach to the fins or head. (2) Preventive Measures: Soak the infected fish in a solution of 8×10⁻⁶ mg/L copper sulfate for 30 minutes, adding 5×10⁻⁶ mg/L chloramphenicol during the treatment. (3) Treatment Methods: Bathe...
Common Koi Disease Treatment – White Spot Disease (Ich)
(1) Symptoms: White spot-like cysts appear on the body surface, fins, and gills of the affected fish. In severe cases, the entire body and fins are covered with white spots and coated with a white mucus layer. (2) Prevention and Treatment Methods: Bathe the fish in a mercurous nitrate solution...
Common Koi Disease Treatment – Myxosporidiosis (Iodine Pox Disease)
(1) Symptoms: The affected fish exhibits extreme emaciation, dull and faded body color, an upturned tail, and frenzied swimming behavior in the water—such as erratic darting, circling, or diving and leaping repeatedly. (2) Preventive Methods: Use 125 kg of quicklime per mu to thoroughly eliminate myxosporidian spores in the sludge,...
Pond Rearing of Koi
I. Pond Preparation Location Choose a site with ample water supply, convenient water inlet and drainage, no pollution, and good transportation access. This facilitates water management and the transport of fry, feed, and mature fish. Water Quality The best water sources are unpolluted rivers, lakes, or reservoirs. Alternatively, water from...
Common Koi Disease Treatment – Saprolegniasis (Water Mold Disease)
(1) Symptoms: The affected fish develops grayish-white, cotton-like fungal hyphae on its body surface or fins. The tissue where the mycelium attaches becomes necrotic, with inflamed, congested, or ulcerated wounds. (2) Prevention and Treatment Methods: Avoid injuring the fish. Before overwintering, use medicated baths or apply treatments throughout the pond...
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Common Koi Disease Treatment – Cold
Jun 12, 2025 -
Common Koi Disease Treatment – Mechanical Injury
Jun 10, 2025 -
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