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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 increased occurrence of devastating viral diseases in shrimp culture systems threatens the sustainability of both the aquaculture industry and the commercial shrimp fishery. HPV is associated with reduced growth rates of juvenile shrimp without showing any gross signs of disease and can lead to mass mortalities in shrimp populations. [21]
Shellfish poisoning includes four syndromes that share some common features and are primarily associated with bivalve molluscs (such as mussels, clams, oysters and scallops.) [1] As filter feeders, these shellfish may accumulate toxins produced by microscopic organisms, such as cyanobacteria, diatoms and dinoflagellates.
PSP affects those who come into contact with the affected shellfish by ingestion. [1] The toxins responsible for most shellfish poisonings—mainly saxitoxin, although several other toxins have been found, such as neosaxitoxin and gonyautoxins I to IV—are water-insoluble, and heat- and acid-stable.
The shrimp-farming industry has developed several broodstocks of both P. stylirostris and P. vannamei that are resistant against IHHN infection. [1] The disease is caused by a single-stranded DNA virus of the species Decapod pestylhamaparvovirus 1, earlier known as IHHN virus, the smallest of the known penaeid shrimp viruses (22 nm). [2]
Getty Images In August, as the price of shrimp soared to $5.80 a pound, CNN called the new price on headless crustaceans an "all-time high." But do you know what consumers today would call that price?
The highest mortality rates occur in L. vannamei, which is one of the two most frequently farmed species of shrimp. Untreated, the disease causes mortality rates of up to 90 percent within 30 days. A first outbreak of NHP had been reported in Texas in 1985; the disease then spread to shrimp aquacultures in South America. [2]
This category is dedicated to the various Fish diseases. For an overview of this subject go to Fish diseases. Subcategories.