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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.
The following is a list of aquarium diseases. Aquarium fish are often susceptible to numerous diseases, due to the artificially limited and concentrated environment. New fish can sometimes introduce diseases to aquaria, and these can be difficult to diagnose and treat. Most fish diseases are also aggravated when the fish is stressed.
The white spots may reach more than 1 mm in diameter and are easily recognized on skin and fins whereas trophonts attached to the gills are hard to see due to the gill cover . Skin: Ich infections are usually visible as one or several characteristic white spots on the body or fins of the fish. The white spots are single cells called trophonts ...
Small, itchy bumps: These may be red, white, or yellow and can appear around the hair follicles. ... and bumps. Skin Swab: A swab of the affected area may be taken to be looked at more closely ...
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.
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.