College of Life Sciences, Shaanxi Normal University, Xi'an, Shaanxi, China.
Shaanxi Key Laboratory for Animal Conservation, Shaanxi Institute of Zoology, Xi'an, Shaanxi, China.
PLoS One. 2020 Mar 18;15(3):e0230320. doi: 10.1371/journal.pone.0230320. eCollection 2020.
In this study, two parasites on the fins of Homatula variegata were recorded from March to September 2016. A dissection mirror was used to examine the distribution and quantity of the ectoparasitic Gyrodactylus sp. and Paragyrodactylus variegatus on the host Homatula variegata in different seasons. The present study explored possible explanations for the site specificity of gyrodactylid parasites in 442 Homatula variegata infected with 4307 Gyrodactylus sp. (species identification is incomplete, only characterized to the genus level) and 1712 Paragyrodactylus variegatus. These two gyrodactylid parasites were collected from fish fins, and the fish were harvested in China's Qinling Mountains.The results indicated that the highest number of Gyrodactylus sp., which was numerically the dominant species, appeared on the fish fins in April, while the highest number of Paragyrodactylus variegatus was found on the fish fins in March. The two parasite species appeared to be partitioned spatially, with Gyrodactylus sp. occurring more frequently on pectoral and pelvic fins, and P. variegatus occurring more frequently on caudal fins. However, Gyrodactylus sp. appeared to occur on fish of all lengths, while P. variegatus tended to occur more abundantly on shorter fish rather than on longer fish. At lower Gyrodactylus sp. infection levels (<100), the pelvic and pectoral fins were the main locations of attachment, followed by the dorsal fin. For infections of more than 100 parasites, more samples of Gyrodactylus sp. were located on the pectoral fin. For a low number of Paragyrodactylus variegatus infections (<100), the pelvic and pectoral fins were the preferred locations of attachment, followed by the caudal fin. Between April and September, there were many monogenean parasites on fish fins, and the fish size was within the range of 5-10 cm. However, when a fish was longer than 10 cm long, the number of parasites on its fins greatly decreased.
本研究于 2016 年 3 月至 9 月记录了杂斑光唇鱼（Homatula variegata）鳍上的两种寄生虫。使用解剖镜检查了不同季节寄生在宿主杂斑光唇鱼（Homatula variegata）鳍上的外寄生 Gyrodactylus sp. 和 Paragyrodactylus variegatus 的分布和数量。本研究探索了 442 条杂斑光唇鱼（感染了 4307 只 Gyrodactylus sp.（种属鉴定不完全，仅鉴定到属级）和 1712 只 Paragyrodactylus variegatus）中 Gyrodactylus 寄生虫的部位特异性的可能解释。这两种 Gyrodactylus 寄生虫均采集自鱼鳍，鱼来自中国秦岭地区。结果表明，数量最多的 Gyrodactylus sp.（数量优势种）出现在 4 月的鱼鳍上，而 Paragyrodactylus variegatus 则出现在 3 月的鱼鳍上。这两种寄生虫似乎在空间上是分开的，Gyrodactylus sp. 更频繁地出现在胸鳍和腹鳍上，而 P. variegatus 更频繁地出现在尾鳍上。然而，Gyrodactylus sp. 似乎出现在所有长度的鱼上，而 P. variegatus 则倾向于出现在较短的鱼上，而不是较长的鱼上。在较低的 Gyrodactylus sp. 感染水平（<100）下，附着的主要部位是腹鳍和胸鳍，其次是背鳍。对于超过 100 个寄生虫的感染，更多的 Gyrodactylus sp. 样本位于胸鳍上。对于数量较少的 Paragyrodactylus variegatus 感染（<100），附着的首选部位是腹鳍和胸鳍，其次是尾鳍。在 4 月至 9 月期间，鱼鳍上有许多单殖吸虫寄生虫，鱼的大小在 5-10 厘米之间。然而，当鱼的长度超过 10 厘米时，鱼鳍上的寄生虫数量大大减少。
