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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. If pathogens breach these defences, fish can develop inflammatory responses that increase the flow of blood to infected areas and ...
Dermocystidium erschowii Garkavi, Denisov & Afanas'ev 1980— a skin parasite of carp; Dermocystidium fennicum Pekkarinen et al. 2003— a skin parasite of perch [9] Dermocystidium gasterostei Elkan 1962 [7] — a parasite of sticklebacks [10] Dermocystidium granulosum Sterba & Naumann 1970 [7] Dermocystidium guyenotii Thélin 1955 [7]
Ichthyosis (also named fish scale disease) [1] is a family of genetic skin disorders characterized by dry, thickened, scaly skin. [2] The more than 20 types of ichthyosis range in severity of symptoms, outward appearance, underlying genetic cause and mode of inheritance (e.g., dominant, recessive , autosomal or X-linked ). [ 3 ]
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.
Enteric redmouth disease is a bacterial infection of freshwater and marine fish caused by the pathogen Yersinia ruckeri. It is primarily found in rainbow trout and other cultured salmonids. The disease is characterized by subcutaneous hemorrhaging of the mouth, fins, and eyes. It is most commonly seen in fish farms with poor water quality.
[7] [8] These plant and animal pathogens can come from marine environments, or crossover from terrestrial diseases. [3] Little is still known about how these diseases transmit, and scientists are still researching how to control diseases and protect corals. [5] Studies do show that there is no vertical transmission in coral pathogens.
Whether stressed fish are particularly prone to infestation is unclear. Sea-lice infection causes a generalized chronic stress response in fish since feeding and attachment cause changes in the mucus consistency and damage the epithelium resulting in loss of blood and fluids, electrolyte changes, and cortisol release. This can decrease salmon ...
If disease occurs eradication is required. Once the disease is eradicated, good husbandry, surveillance and biosecurity measures are necessary to prevent recurrence. In countries free of epizootic ulcerative syndrome, quarantine and health certificates are necessary for the movement of all live fish to prevent the introduction of the disease.