Braga do Amaral Rafael, Augustus de Araújo Guilherme, Damacena-Silva Luciana, Lopes Rocha Thiago, Massato Takemoto Ricardo, De Marco Júnior Paulo
Laboratory of Theory Metacommunity and Landscape Ecology, Federal University of Goiás, Goiânia, Goiás, Brazil, 74.690-900.
Postgraduate Program in Biodiversity Animal, Federal University of Goiás, Goiânia, Goiás, Brazil, 74.690-900.
Ann Parasitol. 2025 Jul 13;71:31-48. doi: 10.17420/ap71.544.
The success of Trematoda and Nematoda infection in fish involves a complexity of variables. The objective of this study was to report the parasitological descriptors (prevalence, mean abundance, and mean intensity) and community status of Myloplus nigrolineatus as well as to evaluate the relationship between abundance and richness of endoparasites with biometric parameters, sex, Kn the hosts, percentage cover native vegetation and water temperature. A total of 7,256 endoparasites were found: 861 digeneas and 6,395 specimens of nematodes were collected in the intestine from Myloplus nigrolineatus. One species of Digenea and five species of Nematoda were collected. The initial documentation of the prevalence (%) of endohelminth species in M. nigrolineatus revealed the following: Dadaytrema oxicephala (70%), Chabaudinema americanum (52%), Cucullanus pinnai pinnai (13%), Myleusnema bicornis (65%), Procamallanus (Spirocamallanus) inopinatus (9%) and Rondonia rondoni (35%). The mean intensity and mean abundance were 329.82 ± 416 and 315.48 ± 417, respectively. The trematode Dadaytrema oxycephala was considered a central and dominant species. The total abundance was explained by the variables total length, relative condition factor (Kn), percentage cover native vegetation and water temperature. Fish relative condition factor (Kn) and sex were not influenced by the parasite infection and did not impair the body condition of the hosts. The GLMM showed there is no relationship between abundance and richness of endoparasites with percentage cover native vegetation, while that every twenty centimeters more in the total length of the hosts, the abundance of endoparasites in the intestine increases, approximately, 2 specimens.
吸虫和线虫在鱼类中的感染成功涉及多种复杂变量。本研究的目的是报告黑带油鲇的寄生虫学描述指标（患病率、平均丰度和平均强度）及群落状况，并评估内寄生虫的丰度和丰富度与宿主的生物测量参数、性别、Kn、本地植被覆盖百分比和水温之间的关系。共发现7256条内寄生虫：从黑带油鲇肠道中收集到861条复殖吸虫和6395条线虫标本。收集到1种复殖吸虫和5种线虫。对黑带油鲇体内内蠕虫物种患病率（%）的初步记录显示如下：尖首达氏吸虫（70%）、美洲查氏线虫（52%）、平氏库氏线虫（13%）、双角油鲇线虫（65%）、异尖异尖线虫（9%）和朗多尼亚朗多尼吸虫（35%）。平均强度和平均丰度分别为329.82±416和315.48±417。复殖吸虫尖首达氏吸虫被认为是核心优势物种。总丰度可由全长、相对条件因子（Kn）、本地植被覆盖百分比和水温等变量来解释。鱼类相对条件因子（Kn）和性别不受寄生虫感染影响，也不损害宿主的身体状况。广义线性混合模型显示，内寄生虫的丰度和丰富度与本地植被覆盖百分比之间没有关系，而宿主全长每增加20厘米，肠道内寄生虫的丰度大约增加2个标本。
