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- Title
Changes in movement, range and habitat preferences of adult grayling from late summer to early winter.
- Authors
Nykänen, M.; Huusko, A.; Lahti, M.
- Abstract
Radio-tagged adult grayling Thymallus thymallus (n=22), monitored from mid August to mid December1999 in the River Kuusinkijoki, Finland, shifted by the end of September (water temperature 10.0–14.5°C) from riffle sites to deeper and slower pool sites 0.7–1.6km up- or downstream. In early winter (c. 0°C water temperature), eight of 13 fish still under study made a further shift into new pool sites, possibly triggered by ice formation. The summer range of grayling in the riffles was smaller (mean±S.D. length: 75±146 m) than the autumn range (99±46 m) in the pools, but gross daily movements were equally short in both the seasons (18±34m and 15±7 m, respectively). In late summer, adult grayling preferred water depths 80120 cm and mean velocities >40 cm s&sup-1;. In autumn, the preferred ranges were 100–240cm and <30 cm s&sup-1;, respectively. Substratum was mainly boulders in the summer sites, and gravel or pebbles in the autumn sites.
- Subjects
GRAYLING; HABITATS; BIOTELEMETRY; WINTER; FISHES
- Publication
Journal of Fish Biology, 2004, Vol 64, Issue 5, p1386
- ISSN
0022-1112
- Publication type
Article
- DOI
10.1111/j.0022-1112.2004.00403.x