Research Document - 2002/032

Rainbow trout (Oncorhynchus mykiss) investigations
in Trout River, Newfoundland, 2001.

By Mullins, C.C., and T. R. Porter

Abstract

In 2001 investigations were undertaken in Trout River, Newfoundland to verify the presence of rainbow trout (Oncorhyncus mykiss) and to determine the extent to which they have become established. Rainbow trout abundance, in-stream distribution, spawning success and habitat utilization was investigated. The study was a collaboration of the Department of Fisheries and Oceans, Gros Morne National Park, the Atlantic Salmon Federation, and the Community of Trout River. The results indicate that rainbow trout have established a small population in Trout River. This is the first confirmed rainbow trout population in western Newfoundland. Atlantic salmon and brook trout are also present throughout the Trout River system as well as other species. The length frequency distribution of rainbow trout collected indicates that they have successfully reproduced for several years. The distribution of rainbow trout within the Trout River system appears to be restricted to Trout River Pond, the mainstem of Trout River downstream from Trout River Pond, and Feeder Brook, the first tributary (approximately 1.0 km) upstream from the estuary. More intensive surveys to determine rainbow trout spawning locations and rearing areas may suggest reasons for this or reveal a wider distribution within the river system. Studies of habitat preference may also reveal the extent to which rainbow trout would colonize other river systems.

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