Different groups parasitize the gills of fishes, and the organisms can interact in positive, negative, or neutral ways, depending on parasitic abundance, environmental conditions, and the availability of resources. Here, we studied the distribution of ectoparasites on the gills of the mullet Mugil curema in the Cabedelo port region (Brazil), asking if (1) the gill parasites of M. curema fix on specific host gill arches and/or (2) co-occur in the same gill arches within a host individual; (3) if the abundance of one parasite taxon affects the abundance of another on the same gill arches; and (4) considering distinct major groups, if parasites present patterns of co-occurrence on hosts and gill arches different from the expected at random. We used generalized linear models, generalized linear mixed models, and models with zero inflation to define the microhabitats (arches) with the highest abundances of parasites and null models to analyze the co-occurrences of gill parasite groups. Three taxa of Monogenea (Ligophorus brasiliensis Abdallah, Azevedo & Luque, 2009, Ligophorus sp. 1 and Ligophorus sp. 2) and six species of Copepoda were recorded (Bomolochus nitidus Wilson, 1911; Caligus praetextus Bere, 1936; Ergasilus atafonensis Amado & Rocha, 1997; Ergasilus bahiensis Amado & Rocha, 1997; Ergasilus caraguatatubensis Amado & Rocha, 1997 and Ergasilus lizae Krøyer, 1863). We found that, in general, the gill parasites were more abundant/prevalent on specific arches (I and II) of the hosts, shared such preferences and co-occurred on the gill arches. The presence of one taxon influenced the occurrence of another only in the arches I and II; as a result, the infracommunities were characterized as interactive in the gills of this host species.

不同的群体将鱼类的para寄生，根据寄生虫的丰度，环境条件和资源的可用性，生物体可以以积极，消极或中立的方式相互作用。在这里，我们研究了Cabedelo港口地区（巴西）的鱼Mugil curma ill上的外寄生虫分布，询问是否（1）curma的。寄生虫。修复特定的宿主腮弓和/或（2）在宿主个体内的同一腮弓中同时出现；（3）如果一个寄生生物分类单元的丰度影响了同一g弓上另一个寄生生物的丰度；（4）考虑不同的主要群体，如果寄生虫在宿主和g弓上呈现的共生模式与随机预期的不同。我们使用广义线性模型，广义线性混合模型和零膨胀模型来定义寄生虫丰度最高的微生境（拱形），并使用空模型来分析para寄生虫群的同时出现。Monogenea的三个分类群（Ligophorus brasiliensis Abdallah，Azevedo＆Luque，2009，Ligophorus sp.1 and Ligophorussp。2）和6个物种桡足类的记录（Bomolochus大足威尔逊，1911;鱼虱praetextus贝雷，1936;鳋atafonensis阿马多＆罗沙，1997; 鳋bahiensis阿马多＆罗沙，1997;鳋caraguatatubensis阿马多＆罗沙，1997年和鳋lizae柯石谛， 1863年）。我们发现，通常来说，g寄生虫在宿主的特定牙弓（I和II）上更为丰富/普遍，具有相同的偏好，并同时在the弓上出现。一个分类单元的存在仅影响第一和第二拱门中另一个分类单元的出现；结果，在该寄主物种的ill中，该亚群落被认为是相互作用的。