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Velvet disease (also called gold-dust, rust and coral disease) is a fish disease caused by dinoflagellate parasites of the genera Amyloodinium in marine fish, and Oodinium in freshwater fish. The disease gives infected organisms a dusty, brownish-gold color. The disease occurs most commonly in tropical fish, and to a lesser extent, marine ...
Some fish show no external symptoms, but others show signs of infection that include bulging eyes, bloated abdomens, bruised-looking reddish tints to the eyes, skin, gills and fins. Some infected fish have open sores that may look like the lesions from other diseases or from lamprey attacks.
Like humans and other animals, fish suffer from diseases and parasites. Fish defences against disease are specific and non-specific. Fish defences against disease are specific and non-specific. Non-specific defences include skin and scales, as well as the mucus layer secreted by the epidermis that traps microorganisms and inhibits their growth.
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.
Swim bladder disease, also called swim bladder disorder or flipover, is a common ailment in aquarium fish. The swim bladder is an internal gas-filled organ that contributes to the ability of a fish to control its buoyancy , and thus to stay at the current water depth without having to waste energy in swimming. [ 1 ]
Diseases frequently seen in common goldfish include: Swim Bladder Disease is developed when the fish has buoyancy problems due to internal gas build-up. [4] Swim bladder disease may be caused by insufficient fiber, poor water quality, or overfeeding. The fish "may also look physically swollen or bloated..."; it may also swim sideways or upside ...
In rainbow trout fry syndrome, acute disease with high mortality rates occurs. Infected fish may show signs of lethargy, inappetence and exophthalmos before death. [9] A presumptive diagnosis can be made based on the history, clinical signs, pattern of mortality and water temperature, especially if there is a history of the disease in the area.
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.