Kennedy R J, Allen M
Agri-Food and Biosciences Institute, Newforge Lane, Belfast, Northern Ireland, BT9 5PX, U.K.
J Fish Biol. 2016 Sep;89(3):1651-65. doi: 10.1111/jfb.13068. Epub 2016 Jul 4.
The movements of adult Atlantic salmon Salmo salar were determined as they migrated to spawning habitats in a large lacustrine catchment, Lough Neagh, in Northern Ireland. The minimum average ground speed of S. salar through the lake was 2·1 km day(-1) and the mean residence time was 11 days. Tagged S. salar tended to actively migrate through the lake which represented a transitory habitat for adult S. salar. Migration time from the release site, through the lake, to a spawning tributary decreased during the migratory period. During the 4 year study period between 20·5 and 41·6% of tagged S. salar which entered the lake each year, explored at least one other channel before ascending the final spawning tributary. Exploratory behaviour was more likely in S. salar which spawned in the tributaries furthest from the sea. Exploratory behaviour was also more likely to occur during periods of reduced discharge in the natal stream. The fishery management implications of complex pre-spawning behaviour in a mixed stock lacustrine system, are discussed.
在北爱尔兰的内伊湖这个大型湖泊集水区中，研究人员确定了成年大西洋鲑（Salmo salar）洄游至产卵栖息地的活动情况。大西洋鲑在湖中洄游的最低平均地面速度为2.1千米/天，平均停留时间为11天。带有标记的大西洋鲑倾向于积极地在湖中洄游，湖泊对成年大西洋鲑来说是一个过渡栖息地。在洄游期间，从放流地点经湖泊到产卵支流的洄游时间有所减少。在20.5%至41.6%的每年进入湖泊的带有标记的大西洋鲑中，在洄游至最终产卵支流之前，至少会探索一条其他河道。在距离大海最远的支流中产卵的大西洋鲑更有可能出现探索行为。探索行为也更有可能在其出生溪流流量减少的时期发生。文中还讨论了混合种群湖泊系统中复杂的产卵前行为对渔业管理的影响。
