Mycobacteriosis is the second most common infectious disease in zebrafish research colonies, and most often this is caused by Mycobacterium chelonae. The infection is characterized by multiple granulomas in the kidney, coelomic cavity, particularly the ovary. However, most fish still appear clinically normal. Developmental genetics remain a primary area of research with the zebrafish model, and hence, an important use of adult zebrafish is as brood fish to produce embryos. We investigated the effects of experimentally induced M. chelonae infections on fecundity. A total of 480 5D wild-type zebrafish were divided into four groups: controls, males infected, females infected, and both sexes. Exposed fish developed high prevalence of infection, including many females with ovarian infections. Fish were then first subjected to four separate group spawns with four replicate tanks/group. Then, a third of the fish were subjected to pairwise spawns, representing 20 pairs/group, and then the pairs were evaluated by histopathology. Overall, the group and pairwise spawns resulted numerous eggs and viable embryos. However, we found no statistical correlations between infection status and number of eggs or viability. In contrast to Egg Associated Inflammation and Fibroplasia, lesions in infected ovaries were more localized, with large regions of the ovary appearing normal.

译文

结核分枝杆菌病是斑马鱼研究群体中第二大最常见的传染病,通常是由螯虾分枝杆菌引起的。感染的特征是肾脏,腔腔,尤其是卵巢中的多个肉芽肿。但是,大多数鱼在临床上仍看似正常。发育遗传学仍然是斑马鱼模型研究的主要领域,因此,成年斑马鱼的重要用途是作为繁殖胚胎的育雏鱼。我们调查了实验诱导的M. chelonae感染对生殖力的影响。总共480只5D野生型斑马鱼分为四组:对照组,雄性感染,雌性感染以及男女。裸露的鱼类感染率很高,包括许多感染卵巢的雌性。然后,首先对鱼类进行四个单独的产卵,每个产卵有四个重复的水箱。然后,对三分之一的鱼进行成对产卵,代表每对20对,然后通过组织病理学对成对进行评估。总的来说,成对产卵和成对产卵产生了许多卵和有生命的胚胎。但是,我们没有发现感染状况与卵数或生存力之间的统计相关性。与卵子相关的炎症和纤维化形成相反,受感染的卵巢中的病变更局限,卵巢的大部分区域显示正常。

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