Helminth infection, with high mortality rate, causes significant damage to fish industry worldwide In Kashmir, about 31 species of helminths are known to affect local fish population. In this study, we investigated seasonal variation of helminth parasites in snow trout (Schizothorax plagiostomus Heckel,1838) and scale carp (Cyprinus carpio communis Linnaeus, 1758) collected from Sukhnag stream for a period of two years (February 2017 to January 2019). Helminths Adenoscolex oreini (cestode), Diplozoon kashmirensis (trematode), and Pomphorhynchus kashmirensis (acanthocephalan) were recovered from S. plagiostomus while Bothriocephalus acheilognathi (cestode) and P. kashmirensis have been recovered from C. carpio communis. Prevalence and mean intensity of helminth infection was highest in S. plagiostomus (25.26% and 13.79) and lowest in C. carpio communis (10.82% and 8.47), respectively. Prevalence of helminths was at its peak in summer (June/July) and lowest in winter (December/January) in both native (S. plagiostomus) and exotic (C. carpio communis) fish species. This study revealed significant seasonal and monthwise variation in parasitic load of fishes which could be due to the difference in temperature, feeding habits of fish, fish species, immunity levels and other abiotic conditions of the water body.

中文翻译：

---

克什米尔苏克纳格河一些淡水鱼类中蠕虫感染的发生率和发生率

蠕虫感染具有很高的死亡率，对全世界的鱼类产业造成重大破坏。在克什米尔，已知约有31种蠕虫会影响当地的鱼类种群。在这项研究中，我们调查了两年（2017年2月至2019年1月）从Sukhnag溪流中采集的鳟鱼（Schizothorax plagiostomus Heckel，1838）和鳞鱼（Cyprinus carpio communis Linnaeus，1758）的蠕虫寄生虫的季节性变化。蠕虫Adenoscolex oreini（种马），Diplozoon克什米尔种（trematode）和Pomphorhynchus kashmirensis（棘头动物）从S. plagiostomus中回收，而Bothriocephalus acheilognathi（Cestode）和克什米尔P. kashmirensis已从鲤鱼C. carpio communis中回收。斜纹葡萄球菌的患病率和平均强度分别为最高的斜。链霉菌（25.26％和13.79），最低的鲤鱼线虫感染（10.82％和8.47）。在本地（S. plagiostomus）和外来（C. carpio communis）鱼类中，蠕虫的流行在夏季（6月/ 7月）达到高峰，在冬季（12月/ 1月）达到最低。这项研究表明，鱼的寄生负荷有明显的季节性和逐月变化，这可能是由于温度，鱼的摄食习惯，鱼的种类，免疫力水平和水体的其他非生物条件的差异所致。