Aquaculture Center of São Paulo State University (CAUNESP), Jaboticabal, Brazil.
Parasitol Res. 2013 Jan;112(1):443-6. doi: 10.1007/s00436-012-3069-5. Epub 2012 Aug 14.
The determination of mean intensity of parasitism for colony-forming sessile protozoan such as Epistylis has been a great problem in parasitological studies. Some alternatives have been proposed by researchers for laboratory and field conditions. This study describes the criteria to establish the parasitic intensity score for epistylidid infestation in fish. Parasite distribution and the host-parasite relationship in four species of Brazilian cultured catfish and their hybrids are discussed. The highest prevalence rates were found in the hybrid jundiara, Leiarius marmoratus male × Pseudoplatystoma reticulatum female (96.4 %), followed by jurupoca, Hemisorubim platyrhynchos (60 %), and the hybrid surubim, Pseudoplatystoma corruscans male × P. reticulatum female (52.7 %). Positive correlation between parasitic intensity score and the fish size, weight, and relative condition factor were also observed. These findings indicate that Epistylis infestation in Brazilian catfish is an emerging disease in cultured fish.
对于群体形成的固着原生动物（如 Epistylis）的寄生平均强度的测定，一直是寄生虫学研究中的一个大问题。一些研究人员已经为实验室和野外条件提出了一些替代方法。本研究描述了用于确定鱼类中 epistylidid 感染寄生强度评分的标准。讨论了巴西养殖鲶鱼及其杂交种中四种鱼类的寄生虫分布和宿主-寄生虫关系。杂交 jundiara（Leiarius marmoratus 雄性 × Pseudoplatystoma reticulatum 雌性）的流行率最高（96.4%），其次是 jurupoca（Hemisorubim platyrhynchos）（60%）和杂交 surubim（Pseudoplatystoma corruscans 雄性 × P. reticulatum 雌性）（52.7%）。还观察到寄生强度评分与鱼的大小、体重和相对条件系数之间存在正相关关系。这些发现表明，巴西鲶鱼中的 Epistylis 感染是养殖鱼类中的一种新兴疾病。
