Upstream migratory behaviour in landlocked Arctic charr |
| |
Authors: | Ingemar Näslund |
| |
Institution: | (1) Department of Aquaculture, Swedish University of Agricultural Sciences, Box 1457, S-90124 Umeå, Sweden |
| |
Abstract: | Synopsis Extensive upstream migration of landlocked Arctic charr during spring floods was recorded in several tributaries of an oligotrophic lake in north-west Sweden. Migration was confined to a period of about two weeks and residence in most creeks was of short duration. Only fish migrating to two small productive lakes remained in the new habitat over the summer. Repeated annual migrations were only recorded in the creek leading to these lakes and no straying was observed among repeat migrants. Water temperatures provided the primary cues for initiation and direction of migration, although an ability to detect productive habitats by odour was indicated. Creek size, feeding opportunities during migration and conspeeific odour were subordinate guiding factors. |
| |
Keywords: | Fish migration Timing Size of migrants Repeat migration Proximate factors Ultimate factors Salvelinus alpinus Salmonidae |
本文献已被 SpringerLink 等数据库收录! |