Chemical Basis for Homing of Atlantic Salmon ( Salmo salar ) to a Hatchery
Based on recoveries from traps situated at a hydroelectric dam and a hatchery 1500 m downstream, the return location of hatchery reared and wild Atlantic salmon is examined. During the fall runs of 1971 and 1972, 97% of ascending wild salmon returned to the dam; only 3% were recovered at the hatcher...
| Published in: | Journal of the Fisheries Research Board of Canada |
|---|---|
| Main Authors: | , |
| Format: | Article in Journal/Newspaper |
| Language: | French |
| Published: |
Canadian Science Publishing
1973
|
| Subjects: | |
| Online Access: | http://dx.doi.org/10.1139/f73-159 http://www.nrcresearchpress.com/doi/pdf/10.1139/f73-159 |
| Summary: | Based on recoveries from traps situated at a hydroelectric dam and a hatchery 1500 m downstream, the return location of hatchery reared and wild Atlantic salmon is examined. During the fall runs of 1971 and 1972, 97% of ascending wild salmon returned to the dam; only 3% were recovered at the hatchery. Despite the fact that the hatchery discharge contributed only 1/1000th of the river’s flow, 67% of the hatchery-reared fish returned to the hatchery and 33% to the dam.Tank tests demonstrated a clear-cut preference by hatchery adults for diluted hatchery effluent vs. river water. Wild fish showed no preference to either water. Well water, a component of hatchery effluent, was avoided by both hatchery and wild fish. Addition of CuSO 4 to preferred water altered its effectiveness. |
|---|