论文部分内容阅读
在北海道知床半岛周边海域,用小型数据记录器监测细鳞大马哈鱼Oncorhyncus gorbuscha和大马哈鱼O.keta的回归游泳行为,探讨其与环境水温的关系。数据记录间隔时间为1 s,连续记录时间为226 h。于2008年8月至10月期间,在知床沿岸放流了带有数据记录器的洄游途中的大马哈鱼和细鳞大马哈鱼个体(分别为30尾和5尾),分别有13尾、3尾个体被捕获。研究表明:试验个体有一系列的上浮和下沉行为,并且频繁地回到表层水面,垂直移动中的深潜水是对表层高水温和暖流分层水中的一种适温调节行为。因此,尽管表层水温较高,性成熟后的大马哈鱼仍会回到表层水面寻找其产卵场所。
A small data logger was used to monitor the return swimming behavior of Oncorhyncus gorbuscha and O.keta in the waters off Shirei Peninsula in Hokkaido to investigate its relationship with ambient water temperature. The data recording interval is 1 s and the continuous recording time is 226 h. Between August and October 2008, a total of 30 salmon and 31 salmon fish (30 and 5 respectively) were released on the Shiretoko coast with data loggers during their migration , 3 individuals were captured. The results show that there are a series of floating and sinking behaviors in the test individuals, and they frequently return to the surface water. The deep diving in the vertical movement is a suitable temperature regulating action on the surface water with high temperature and warm water. Therefore, despite the higher surface water temperatures, the salmon will return to the surface water to find its spawning grounds.