Cloutier Véronique B, Glémet Hélène, Ferland-Raymond Bastien, Gendron Andrée D, Marcogliese David J
Centre de Recherche sur les Interactions Bassins Versants, Ecosystèmes Aquatiques, Université du Québec a Trois-Rivières, 3351 Boulevard des Forges, Trois-Rivières, G9A 5H7 Québec, Canada.
J Aquat Anim Health. 2012 Jun;24(2):100-4. doi: 10.1080/08997659.2012.675934.
The possible influence of parasites on the short-term and long-term growth and condition of yellow perch Perca flavescens was examined by investigating correlations between parasite abundance and specific growth variables. The following parasites were enumerated in age-1 yellow perch collected from Lake St. Pierre in June 2008: Apophallus brevis, Diplostomum spp., Ichthyocotylurus spp., Tylodelphys scheuringi, Phyllodistomum superbum, and Raphidascaris acus. Short-term growth was estimated using RNA/DNA ratios and long-term growth via the total length and condition as measured by the Fulton index. No correlation was found between parasite abundance and short-term growth, but a negative influence of combined infections of T. scheuringi and P. superbum on long-term growth was detected. In addition, the abundance of Ichthyocotylurus spp. was positively correlated with the condition of the yellow perch. Together these results suggest that limited or subtle pathogenic effects in juvenile fish are not discernable in recent growth but only in long-term growth indices. Furthermore, in future studies examination of parasite effects on fish growth should account for multiple infections.
通过研究寄生虫丰度与特定生长变量之间的相关性，考察了寄生虫对黄鲈（Perca flavescens）短期和长期生长及健康状况的潜在影响。在2008年6月从圣皮埃尔湖采集的1龄黄鲈中，统计了以下几种寄生虫：短阿波吸虫（Apophallus brevis）、复口吸虫属（Diplostomum spp.）、鱼杯尾吸虫属（Ichthyocotylurus spp.）、舍氏泰勒吸虫（Tylodelphys scheuringi）、华丽叶形吸虫（Phyllodistomum superbum）和尖锐绕体线虫（Raphidascaris acus）。利用RNA/DNA比率估计短期生长，通过全长和用福尔顿指数衡量的健康状况评估长期生长。未发现寄生虫丰度与短期生长之间存在相关性，但检测到舍氏泰勒吸虫和华丽叶形吸虫的混合感染对长期生长有负面影响。此外，鱼杯尾吸虫属的丰度与黄鲈的健康状况呈正相关。这些结果共同表明，幼鱼中有限或细微的致病作用在近期生长中难以察觉，而仅在长期生长指标中有所体现。此外，在未来的研究中，考察寄生虫对鱼类生长的影响时应考虑多重感染。
