his disease is usually called “White Spot Disease”, since the parasite can be seen with the naked eye as one mm diameter white spots distributed over the body and fins when it is in the trophozoite stage, the feeding phase of the parasite. It should be noted that, despite appearances, the parasites actually sit within the epidermis, and not on the surface. This makes treatment more complicated, as a topical approach will not easily work.
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We have recently seen a high incidence of cataracts in farmed salmon in several European countries, Canada, and Chile. Salmonids depend on vision for normal feed intake and, not surprisingly, cataracts have been shown to reduce feed conversion efficiency and growth rates, which ultimately raise the cost of rearing fish. Consequently, cataracts can have a significant economic impact on salmonid aquaculture. It is important to note at the outset that “cataracts” is a clinical definition, and their presence does not necessarily mean that changes can...
Infectious salmon anaemia (ISA) is a disease caused by infectious salmon anaemia virus (ISAV), genus Isavirus, family Orthomyxoviridae that affects primarily marine-farmed Atlantic salmon (Salmo salar). Recorded for the first time in 1984 in Norway, it still causes recurrent epidemic outbreaks in Chile. The disease is present in most countries that farm Atlantic salmon: Norway, Scotland, Ireland, Faroe Islands, Canada, USA, and Chile. The virus is adapted to cold-water salmonid fish and has an optimum growth at 15°C. Atlantic salmon is the only species known...
Tenacibaculosis is primarily a skin infection causing ulcerative dermatitis in a range of commercially important species worldwide. Three species belonging to the genus Tenacibaculum have been associated with the disease: T. dicentrarchi, T. finnmarkense, and T. maritimum. These bacteria are all Gram-negative and filamentous. In marine fish, the most common isolate is T. maritimum. There is variation in the external pathological signs of the disease, depending on the species and age of the fish involved. Different names have been used for this usually ulcerative dermatitis; they include salt water columnaris...
