Centre of Research for Development, University of Kashmir, India.
Vet Parasitol. 2012 Oct 26;189(2-4):218-26. doi: 10.1016/j.vetpar.2012.04.029. Epub 2012 Apr 27.
Monogeneans are of great interest to the ecologists because of their simple life cycle and are considered as one of the important and sensitive parasites to any changes in water quality. The monogenean gill parasite, Diplozoon kashmirensis of the Carassius carassius was examined with the aim to evaluate the infection level and the factors influencing the infection. Our results showed that highest prevalence (34.22%) of D. kashmirensis was in the lake having high trophic status and least prevalence (10.90%) in the lake having least trophic status. Infection levels were significantly higher at the basins/sites having deteriorated water quality in comparison to the basins/sites having better water quality. The combined effect of pollutants and eutrophication showed decrease in intensity of D. kashmirensis in one of the polluted/hypertrophied site in the hypertrophic lake (Anchar Lake), while as synergistic effect (i.e. increase) on prevalence and intensity was observed in one of the polluted/hypertrophied site in the eutrophic lake (Dal Lake). Sex was not an important factor influencing the D. kashmirensis in three lakes. The study showed that condition factor was significantly higher in the hypertrophic lake and in an uninfected fish. In addition microhabitat influenced the Diplozoon infection. Most preferable site for the D. kashmirensis was middle sector of the gill. Furthermore, the gill parasite showed significantly positive correlation (r(p)=0.6, P<0.05) with water temperature in the hypertrophic lake, thus showing the impact of water temperature on this parasite. It was concluded that intra lake differences, season, condition factor, microhabitat and water temperature influenced the infection of D. kashmirensis. It seems from the data that eutrophic and hypertrophic habitats were favourable for the D. kashmirensis. The D. kashmirensis showed both antagonistic and synergistic response to the combined effect of pollution and eutrophication.
单殖吸虫对生态学家来说很有研究价值，因为它们的生命周期很简单，被认为是对水质变化很敏感的重要寄生虫之一。本研究以鲤鱼（Carassius carassius）的鳃单殖吸虫 Diplozoon kashmirensis 为研究对象，旨在评估其感染水平以及影响感染的因素。结果表明，在富营养化程度高的湖泊中，D. kashmirensis 的感染率最高（34.22%），而在富营养化程度最低的湖泊中，感染率最低（10.90%）。与水质较好的湖区相比，水质恶化的湖区和湖区中，D. kashmirensis 的感染水平显著更高。在富营养化湖泊（安查尔湖）的一个污染/富营养化地区，污染物和富营养化的综合影响降低了 D. kashmirensis 的强度，而在富营养化湖泊（达尔湖）的一个污染/富营养化地区，观察到协同作用（即感染率和强度增加）。性不是影响三个湖泊中 D. kashmirensis 的重要因素。研究表明，在富营养化湖泊和未感染的鱼类中，条件因素显著较高。此外，微生境影响 Diplozoon 感染。D. kashmirensis 最偏好的部位是鳃的中部。此外，鳃寄生虫与富营养化湖泊的水温呈显著正相关（r(p)=0.6，P<0.05），表明水温对这种寄生虫有影响。研究结论为，湖泊内差异、季节、条件因素、微生境和水温影响 D. kashmirensis 的感染。从数据来看，富营养化和富营养化的生境有利于 D. kashmirensis 的生长。D. kashmirensis 对污染和富营养化的综合影响表现出拮抗和协同反应。
