Abstract：
The current conservation status of Percichthys trucha (Creole perch) is Least Concern, although the population trend is considered to be decreasing. We conducted an extensive survey of parasite fauna in this species over two decades in its distribution range in Argentina. Fish were collected using gill and trawl nets. Parasites were collected, identified, and counted to calculate prevalence and mean intensity. The present work reports the parasite species infecting P. trucha, using data from our own survey and from previously published records. This information enables us to evaluate infection and distribution patterns, assess the role of P. trucha as host, determine the specificity of the parasites, and evaluate the threat represented by introduced, invasive parasites. The data set consists of a total of 453 host-parasite-locality records, of which only 15 are exclusively bibliographic. We found 44 parasite taxa: 19 digeneans, 4 monogeneans, 5 cestodes, 8 nematodes, 4 acanthocephalans, 3 crustaceans, and 1 mollusk. The most represented families were Diplostomidae, Heterophyidae, and Dactylogyridae. This study increases the number of parasite species known from 25 to 44. It can be concluded that this parasite fauna is characterized by high diversity, particularly of digeneans, and most of the parasites reproduce within this host, a pattern which is related to the top position of this fish species in the trophic webs. Six parasite species (Allocreadium patagonicum, Homalometron papilliferum, Acanthostomoides apophalliformis, Duplaccessorius andinus, Pseudodelphys limnicola, and Hysterothylacium patagonense) exhibit high host specificity (only matures in Creole perches) and are widely distributed, which could now be considered as \"biogeographical core helminth fauna.\" Some P. trucha populations are affected by the invasion of alien fishes like Cyprinus carpio and pathogenic parasites like Lernaea cyprinacea and Schizocotyle acheilognathi. Our findings emphasize the need for further research.
摘要：
Percichthystrucha（克里奥尔鲈鱼）的保护现状是最不受关注的，尽管人口趋势被认为正在下降。我们在阿根廷的分布范围内对该物种的寄生虫动物进行了广泛的调查。使用g和拖网收集鱼。收集了寄生虫，已识别,并计数以计算患病率和平均强度。本工作报告了感染Trucha的寄生虫物种，使用来自我们自己的调查和以前发布的记录的数据。这些信息使我们能够评估感染和分布模式，评估P.trucha作为宿主的作用，确定寄生虫的特异性，并评估引入的威胁，侵入性寄生虫.数据集由453个宿主-寄生虫-局部记录组成,其中只有15个是专门的书目。我们发现了44个寄生虫类群:19个双子，4个单基因，5个昆虫，8线虫，4个棘头鱼，3甲壳类动物，和1只软体动物。最具代表性的家庭是二倍体科，杂科，和Dactylogyridae。这项研究将已知的寄生虫物种数量从25种增加到44种。可以得出结论，这种寄生虫动物群具有高度多样性的特点，尤其是对二族，大多数寄生虫在这个宿主内繁殖，与该鱼类在营养网中的最高位置有关的模式。六种寄生虫（巴塔哥尼合金，伞形突起,假象刺五加,Duplaccessoriusandinus,假德尔菲,andHysterothylaciumpatagonense)exhibithighhostspecificity(onlymaturesinCreoleperches)andarewidelydistributed,现在可以被认为是“生物地理学核心蠕虫动物”。\“一些P.trucha种群受到外来鱼类如鲤鱼和致病性寄生虫如Lernaeacyprinacea和Schizocotyleacheilognathi的入侵的影响。我们的发现强调了进一步研究的必要性。
