The onset of downstream movement of juvenile Atlantic salmon, Salmo salar L., in a chalk stream

摘要: The downstream movements of wild Atlantic salmon, Salmo salar L., from their established feeding territories in the River Itchen, Hampshire, UK, were logged continuously over an 11-month period using a passive integrated transponder (PIT) antenna system. time these was then related to number monitored and calculated environmental parameters. Initial movement smolts April correlated with onset darkness, at which salmon moved alone. No relationship found between migrating river flow or maximum daily water temperature. timing parr October March random regard sunset temperature, suggesting cue that initiates may be different outside spring smolt period.