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首页> 外文期刊>Aquatic Living Resources >Occurrence and lack of transmissibility of gonadal neoplasia in softshell clams, Mya arenaria, in Maine (USA) and Atlantic Canada
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Occurrence and lack of transmissibility of gonadal neoplasia in softshell clams, Mya arenaria, in Maine (USA) and Atlantic Canada

机译：在缅因州（美国）和加拿大大西洋的软壳蛤，Mya arenaria中发生性腺肿瘤的发生和缺乏可传播性。

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Gonadal neoplasms (germinomas) in softshell clams, Mya arenaria, have only been reported from locations in Maine, USA despite the fact that the geographic range of M. arenaria extends from Labrador to North Carolina on the east coast of North America. To more accurately determine the geographic distribution of this disease, adult clams (n = 18-60 per sample) obtained between 1989 and 1997 from sites along the entire coast of Maine and from Atlantic Canada (New Brunswick, Nova Scotia, and Prince Edward Island) were examined histologically for the presence of neoplasia. Gonadal neoplasms were present at 10 of the 28 locations sampled, including sites in Maine, New Brunswick, Nova Scotia, and Prince Edward Island, at prevalences ranging from 3.3 to 50% and at all stages of development. Prevalence and stage of development, however, were consistently greater at sites located between Penobscot Bay, Maine and Passamaquoddy Bay, New Brunswick. There was no correlation between mean clam size (shell length) and prevalence. Clams with neoplasia were predominantly female. To assess possible disease transmissibility and subsequent mortality rates, naive clams were transplanted to a site where neoplasia is enzootic and placed in close proximity to clams having the disease. After 6 months, no evidence of neoplasia was found in the transplanted clams even though cumulative mortality (14.7%) was greater than that in local clams (3.4%). These results suggest that gonadal neoplasms in M. arenaria progress slowly and cause little mortality once present in an individual and may not have an infectious etiology. Loss of reproductive output is a potential long-term effect of the disease.
机译：尽管蛤c分枝杆菌的地理范围从拉布拉多延伸到北美东海岸的北卡罗来纳州，但仅在美国缅因州才报道过软壳蛤My性腺中的性腺瘤（生殖器瘤）。为了更准确地确定这种疾病的地理分布，在1989年至1997年之间从缅因州整个海岸和加拿大大西洋（新不伦瑞克省，新斯科舍省和爱德华王子岛）采集了成年蛤（（每个样品n = 18-60） ）进行了组织学检查是否有肿瘤形成。采样的28个地点中有10个存在性腺肿瘤，包括缅因州，新不伦瑞克省，新斯科舍省和爱德华王子岛的地点，患病率从3.3％到50％不等，并且处于发育的各个阶段。但是，在缅因州Penobscot湾和新不伦瑞克省Passamaquoddy湾之间的地点，患病率和发育阶段一直较高。蛤的平均大小（壳长）与患病率之间没有相关性。患有赘生物的蛤主要为雌性。为了评估可能的疾病传播性和随后的死亡率，将幼稚的蛤transplant移植到赘生性动物的位置，并将其放置在与患有该疾病的蛤close非常接近的位置。 6个月后，尽管累积死亡率（14.7％）高于当地蛤（3.4％），但在移植的蛤中未发现赘生物。这些结果表明，沙眼分枝杆菌的性腺肿瘤进展缓慢，一旦出现在个体中几乎不会引起死亡，并且可能没有传染性病因。生殖输出的丧失是该疾病的潜在长期影响。

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