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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.
Digenea (Gr. Dis – double, Genos – race) is a class of trematodes in the Platyhelminthes phylum, consisting of parasitic flatworms (known as flukes) with a syncytial tegument and, usually, two suckers, one ventral and one oral.
Trematodes can cause disease in many types of vertebrates, including mammals, birds, reptiles, and fish. Cattle and sheep can become infected by eating contaminated food. These infections lead to a reduction in milk or meat production, which can be of significant economic importance to the livestock industry.
The economic impact of such parasites can be severe, especially where prevalence rates are high; they may also have a severe impact on wild fish stocks. The diseases caused by myxosporeas in cultured fish with the most significant economic impact worldwide are proliferative kidney disease (PKD) caused by the malacosporean T. bryosalmonae, and ...
Myxosporea is a class of microscopic animals, all of whom are parasites.They belong to the Myxozoa clade within Cnidaria.They have a complex life cycle that comprises vegetative forms in two hosts—one an aquatic invertebrate (generally an annelid but sometimes a bryozoan) and the other an ectothermic vertebrate, usually a fish.
The name literally translates as "the fish louse with many children". The parasite can infect most freshwater fish species and, in contrast to many other parasites, shows low host specificity. It penetrates gill epithelia, skin and fins of the fish host and resides as a feeding stage (the trophont) inside the epidermis.
Animal parasites of fish (2 C, 62 P) Pages in category "Parasites of fish" The following 148 pages are in this category, out of 148 total.
In fish, the disease is most important in salmonids. Marine and freshwater fish can be infected. These protozoans can be found on most continents. Bloodfeeding leeches are implicated in the transmission of the bloodborne species. The protozoans can be identified in skin and gill biopsies and blood samples.