Poléo A B S, Schjolden J, Hansen H, Bakke T A, Mo T A, Rosseland B O, Lydersen E
Department of Biology, University of Oslo, P.O. Box 1066, Blindern, N-0316 Oslo, Norway.
Parasitology. 2004 Feb;128(Pt 2):169-77. doi: 10.1017/s0031182003004396.
Atlantic salmon (Salmo salar) parr (age 0+), infected by the ectoparasite Gyrodactylus salaris, were exposed to aqueous aluminium (Al), copper (Cu), zinc (Zn), iron (Fe) and manganese (Mn), at 4 different concentrations. There was a negative correlation between G. salaris infections and metal concentrations in both Zn- and Al-exposed salmon. In the Zn-experiment, all 4 concentrations tested caused a decrease in the G. salaris infections, while in the Al-experiment the G. salaris infection did not decline at the lowest concentration. The number of G. salaris increased continuously during the experiments in all control groups, and in all groups exposed to Cu, Fe and Mn. At the highest concentration, however, copper seemed to impair the growth of G. salaris infection. The results show that aqueous Al and Zn are environmental factors of importance controlling the distribution and abundance of the pathogen G. salaris. Other pollutants might also have an influence on the occurrence of G. salaris. Finally, the results demonstrate that aqueous Al and Zn have a stronger effect on the parasite than on the salmonid host, suggesting that both metals may be used as a pesticide to control ectoparasites such as G. salaris.
感染了体外寄生虫鲑三代虫（Gyrodactylus salaris）的0龄大西洋鲑（Salmo salar）幼鱼，被暴露于4种不同浓度的水溶性铝（Al）、铜（Cu）、锌（Zn）、铁（Fe）和锰（Mn）中。在暴露于锌和铝的鲑鱼中，鲑三代虫感染与金属浓度之间存在负相关。在锌实验中，所测试的所有4种浓度均导致鲑三代虫感染减少，而在铝实验中，最低浓度时鲑三代虫感染并未下降。在所有对照组以及所有暴露于铜、铁和锰的组中，实验期间鲑三代虫的数量持续增加。然而，在最高浓度时，铜似乎会抑制鲑三代虫感染的增长。结果表明，水溶性铝和锌是控制病原体鲑三代虫分布和丰度的重要环境因素。其他污染物可能也会对鲑三代虫的发生产生影响。最后，结果表明水溶性铝和锌对寄生虫的影响比对鲑科宿主的影响更强，这表明这两种金属都可作为杀虫剂来控制鲑三代虫等体外寄生虫。
