Kumar Ruchika, Madhavi Rokkam, Sailaja Bade
Department of Zoology, Andhra University, Visakhapatnam, 530 003 India.
J Parasit Dis. 2017 Mar;41(1):40-47. doi: 10.1007/s12639-015-0746-1. Epub 2016 Jan 13.
Spatial distribution of ectoparasites on the gills of the mullet collected from two sites, the unpolluted reference site (Site I) and the heavily polluted North western arm of Visakhapatnam harbour (Site II), was analysed. Of the various ectoparasite species found on the gills of the mullet, only (Monogenea) and (Copepoda), occurred commonly at both the sites with more or less high prevalence and mean intensity. at site I preferred gill arch 1 and posterior most and central sections, whereas at site II, it showed preference for gill arch 3, and posterior and proximal sections of the gill. is highly specific in site selection. It preferred gill arch 1 and the anterior and distal parts at both the sites. favoured gill arch 3 and anterior and proximal sectors, a safe place providing absolute protection from the environmental pollution. It is concluded that the distribution of various ectoparasites on the gills of is determined by the force of ventilation water current, the behavioral response of the parasite to the stress induced by pollution and the surface area of gill arches.
分析了从两个地点采集的鲻鱼鳃上外寄生虫的空间分布情况，这两个地点分别是未受污染的参照地点（地点I）和维沙卡帕特南港污染严重的西北分支（地点II）。在鲻鱼鳃上发现的各种外寄生虫物种中，只有（单殖吸虫）和（桡足类）在两个地点都普遍存在，且感染率和平均感染强度或多或少都较高。地点I的（单殖吸虫）更喜欢鳃弓1以及最靠后的中央部分，而在地点II，它更喜欢鳃弓3以及鳃的后部和近端部分。（单殖吸虫）在地点选择上具有高度特异性。它在两个地点都更喜欢鳃弓1以及前部和远端部分。（桡足类）喜欢鳃弓3以及前部和近端区域，这是一个能提供绝对保护免受环境污染的安全场所。得出的结论是，鲻鱼鳃上各种外寄生虫的分布是由通风水流的力量、寄生虫对污染诱导压力的行为反应以及鳃弓的表面积决定的。
