Spatial and temporal distribution of Lepeophtheirus salmonis (Krøyer) larvae in a sea loch containing Atlantic salmon, Salmo salar L., farms on the north-west coast of Scotland.
Spatial and temporal distribution of Lepeophtheirus salmonis (Krøyer) larvae in a sea loch containing Atlantic salmon, Salmo salar L., farms on the north-west coast of Scotland.
复制标题
苏格兰西北海岸养殖场内含有大西洋鲑鱼 Salmo salar L. 的海湾中鲑鱼 Lepeophtheirus Samis (Krøyer) 幼虫的空间和时间分布。
作者：
M. Penston;C. Millar;A. Zuur;I. Davies
一项浮游生物调查调查了苏格兰西北海岸一个海湖中海虱幼虫的空间和时间分布。在两年的时间里，在五个采样站的两个深度(0米和5米)大约每周收集一次浮游生物拖网。调查始于2002年3月，当时研究区域的大西洋鲑鱼养殖场养鱼，在养殖场完成捕捞后于2004年3月完成。回收的虱子90%以上是鲑鱼列蚤(Lepephtheirus salmonis(Krøyer))；因此，本文的结果主要涉及该物种。使用广义加性模型对数据进行分析，其中包含时间、深度和台站的解释变量。无节幼体密度最高的地点与养殖场相邻，这表明在生产周期内，当地养鱼场有时可能是幼虫的来源。幼虫密度有明显的时间趋势，农场的放牧和收获可能是这些增加和减少的原因，特别是在生产周期的开始和结束时。桡足类的分布比无节幼体的分布更广泛，说明幼虫可以从放生地点传播到几公里外。
A plankton survey investigated spatial and temporal distributions of larval sea lice in a sea loch on the north-west coast of Scotland. Plankton tows were collected approximately weekly at two depths (0 and 5 m) at five sample stations over a 2-year period. The survey began in March 2002 when Atlantic salmon, Salmo salar L., farms in the study area stocked with fish and finished in March 2004, after farms completed harvesting. Over 90% of lice recovered were Lepeophtheirus salmonis (Krøyer); therefore, the results of this paper refer largely to that species. The data were analysed using generalized additive models with explanatory variables for time, depth and station. Greatest densities of nauplii were recovered at stations adjacent to farms indicating that the local salmon farms were a likely source of larvae at times during the production cycle. There were significant temporal trends in larval densities and the stocking and harvesting of farms can possibly account for these increases and decreases, particularly at the start and at the end of the production cycle. The distribution of copepodids was more widespread than that of nauplii, indicating that the larvae can be transported several kilometres from the point of release.