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- Title
Observations of avoidance reactions of migrating salmon to a mobile survey vessel in a riverine environment.
- Authors
Yunbo Xie; Michielsens, Catherine G.J.; Gray, Andrew P.; Martens, Fiona J.; Boffey, Jacqueline L.
- Abstract
Detailed avoidance reactions of adult migrating salmon to a mobile survey vessel were successfully observed with side-looking dual-frequency identification sonar (DIDSON) in the lower Fraser River (British Columbia, Canada). Both adult sockeye (Oncorhynchus nerka) and pink salmon (Oncorhynchus gorbuscha) returning to the river were found to avoid the approaching vessel by initiating lateral movements away from the vessel, making the fish unlikely to be insonified by the downward-looking transducers towed by the vessel. The vessel was found to have an estimated mean interference range of 4 m from its propeller. Analyses of the data concluded that once the vessel and fish were separated by more than 7 m, the vessel no longer affected the normal migration behaviour of the fish.
- Subjects
SALMON; SONAR; SOCKEYE salmon; FISHES; PINK salmon; ONCORHYNCHUS; AQUATIC animals; FISH populations; FISHERIES
- Publication
Canadian Journal of Fisheries & Aquatic Sciences, 2008, Vol 65, Issue 10, p2178
- ISSN
0706-652X
- Publication type
Article
- DOI
10.1139/F08-128