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Lymphocystis is a common viral disease of freshwater and saltwater fish. The virus that causes this disease belongs to the genus Lymphocystivirus of the family Iridoviridae . Aquarists often come across this virus when their fish are stressed such as when put into a new environment and the virus is able to grow.
HLLE begins as small pits of receding epithelium (skin) around the fish's head and/or lateral line, and sometimes onto the unpaired fins. Rarely fatal, it does cause disfigurement, making the fish less suitable for public aquarium display. At least 20 families of fish have been identified as having developed HLLE in captivity.
It causes a disease commonly referred to as white spot disease due to the macroscopically visible trophonts (up to 1 mm in diameter) in the skin and fins. The trophont, continuously rotating, is surrounded by host cells (epidermal cells and leukocytes), producing a minute elevation of the skin. These light-reflecting nodules are recognized as ...
White spots (ich) Ichthyophthirius multifiliis parasite: All: Small white spots, which may ulcerate: Treat water with commercially available remedies Hole-in-the-head: Hexamita parasite: Discus and cichlids: Pale ulcerated area around head: Metronidazole or similar medication. Use food containing vitamin C: Skin or gill flukes: Gyrodactylus and ...
Rosacea. What it looks like: Rosacea causes redness and thick skin on the face, usually clustered in the center.Easy flushing, a stinging sensation, and small, pus-filled pimples are other common ...
However, the disease can also develop without the fish showing any external signs of illness, the fish maintain a normal appetite, and then they suddenly die. The disease can progress slowly throughout an infected farm and, in the worst cases, death rates may approach 100 per cent. It is also a threat to the dwindling stocks of wild salmon.
Small, itchy bumps: These may be red, white, or yellow and can appear around the hair follicles. They can be mistaken for acne. Pain or tenderness: The affected areas might be sore or painful to ...
These begin at the base of the dorsal fin on the back of a fish and spread over time, hence the name saddleback disease. [3] Ulcerations on the skin, and subsequent epidermal loss, identifiable as white or cloudy, fungus-like patches – particularly on the gill filaments, may appear. Mucus also accumulates on the gills, head and dorsal regions.