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Temporal and spatial relationships in the movements of loch dwelling brown trout, Salmo trutta L., recorded by ultrasonic tracking for 24 hours
Author(s) -
Tytler P.,
Holliday F. G. T.
Publication year - 1984
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.1984.tb04840.x
Subject(s) - salmo , brown trout , biology , ellipse , trout , home range , salmonidae , fishery , mark and recapture , range (aeronautics) , zoology , ecology , fish <actinopterygii> , habitat , demography , mathematics , geometry , population , sociology , materials science , composite material
Ultrasonic telemetry was used to record simultaneously, over one complete April day, the movements of four adult brown trout, Salmo trutta , which were residents of a shallow Scottish loch. The daily movements were generally along linear tracks. The home ranges are described as standard and 95% confidence ellipses. The area of standard ellipses ranged from 330 to 633 m 2 while 95% confidence ellipses were larger, ranging from 513 to 979 m 2 . The distances separating individuals, which ranged from 1 to 70 m, were greatest during peaks of activity. Although there was considerable spatial overlap of individual home ranges, the trout were not within visual range for most of the tracking period. Close encounters (proximity <2.5m) occurred most frequently and lasted longest at night. It is concluded, from this study, that brown trout in small productive lochs are solitary but may hold temporary station within widely overlapping home ranges.