DESCRIPTION OF A NEW DISEASE CONDITION OCCURRING IN FARMED COHO SALMON, ONCORHYNCHUS-KISUTCH (WALBAUM), IN SOUTH-AMERICA
DESCRIPTION OF A NEW DISEASE CONDITION OCCURRING IN FARMED COHO SALMON, ONCORHYNCHUS-KISUTCH (WALBAUM), IN SOUTH-AMERICA
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DOI：
10.1111/j.1365-2761.1991.tb00585.x
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发表时间：
1991-03-01
影响因子：
2.5
通讯作者：
DIAZMUNOZ, DN
中科院分区：
文献类型：
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作者：
BRANSON, EJ;DIAZMUNOZ, DN
智利南部安库德湾养殖的银鲑（Oncorhynchus kisutch（Walbaum））死亡率很高。 大多数受影响的鱼有类似的皮肤病变，从小面积的凸起的鳞片，通过白色凸起的斑块到浅溃疡。 这些鱼通常也是深色的，昏昏欲睡的，无精打采的。 然而，一些受影响的鱼看起来很正常，没有皮肤病变。 内部病理包括不同程度的腹水、腹膜炎和全身苍白。 脾脏普遍增大。 肾脏和肝脏肿胀，呈灰色，常伴有苍白的局灶性病变。 在受影响的鱼中存在广泛的组织病理学，组织坏死，血管内坏死血栓，大嗜碱性细胞和嗜碱性颗粒，一些游离在组织中，一些包含在细胞内。 嗜碱性颗粒，当地称为“UA”，或未鉴定的物质，被认为是主要的病原体，很可能是立克次体样微生物。
High levels of mortalities have been experienced in farmed coho salmon, Oncorhynchus kisutch (Walbaum), in the Gulf of Ancud, southern Chile. Most affected fish had similar skin lesions ranging from small areas of raised scales through white raised plaques to shallow ulcers. The fish were also generally dark, lethargic and anorexic. However, some affected fish appeared grossly normal with no skin lesions. Internal pathology consisted of varying degrees of ascites, peritonitis and general pallor. Spleens were generally enlarged. Kidneys and livers were swollen and grey in colour, often with pale focal lesions. Extensive histopathology was present in affected fish with tissue necrosis, intravascular necrotic thrombi, large basophilic cells and basophilic granules, some free in the tissues, some contained within cells. The basophilic granules, known locally as the 'UA', or unidentified agent, were thought to be the main aetiological agent, and are likely to be a rickettsia-like organism.