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The walleye epidermal hyperplasia viruses are two species of retroviruses classified under Epsilonretrovirus, a genus in the family of Retroviridae. [1] There are three genome sequenced and identified exogenous retroviruses of this genus which include two known types ( WEHV-1 and WEHV-2 ) associated with walleye epidermal hyperplasia disease.
Skin lesions from WDSV and WEHV were both identified in walleye from Oneida Lake, New York in 1969. [2] The tumors associated with these viruses appear to have a seasonal cycle appearing in the fall then regressing in the springtime, an individual walleye appears to form the neoplasia once in the lifetime in the fish.
Dermatophagia (from Ancient Greek δέρμα (derma) 'skin' and φαγεία (phageia) 'eating') or dermatodaxia (from δήξις (dexis) 'biting') [3] is a compulsion disorder of gnawing or biting one's own skin, most commonly at the fingers. This action can either be conscious or unconscious [4] and it is considered to be a type of pica ...
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However, the disease can also develop without the fish showing any external signs of illness, the fish maintain a normal appetite, and then they suddenly die. The disease can progress slowly throughout an infected farm and, in the worst cases, death rates may approach 100 per cent. It is also a threat to the dwindling stocks of wild salmon.
Walleye is the most popular fish for sport fishing in Saskatchewan, and can be caught in many rivers, reservoirs, and lakes. [32] The International Underwater Spearfishing Association record for largest spearfishing -caught walleye is held by a 13.3-pound walleye caught in 2014 on the South Saskatchewan River north of Lake Diefenbaker .
They may be distinguished from walleyes by the distinctly spotted dorsal fin, by the lack of a white splotch on the caudal fin, by the rough skin over their gills, and by their generally more brassy color, or darker (almost black) color in some regions. The typical sauger is 300 to 400 g (11 to 14 oz) in weight.
Trichophagia is a form of disordered eating in which persons with the disorder suck on, chew, swallow, or otherwise eat hair. [1] The term is derived from ancient Greek θρίξ, thrix ("hair") and φαγεῖν, phagein ("to eat"). [2]