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Invasive species in Canadian Columbia

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Bronwen Lewis
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Conference Poster. summary of invasive species work in the Robson Reach
 
Bronwen Lewis
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As Columbia River fisheries management work proceeds on invasive adult Northern Pike (NP) removal techniques, in the Robson Reach, additional data was required for the assessment of NP recruitment. One key question to support the design of a future control program is whether NP are recruiting locally in the Robson Reach of the Columbia River, or are juvenile and adult NP present as a result of downstream migrants from the Pend D’Oreille system continuing to restock the Robson Reach area. By looking for larval NP, we will confirm the establishment of a breeding NP population, which may have fisheries management implications. No larval NP have been captured to date in the Canadian Columbia River, so more directed sampling was necessary to fully evaluate the potential for successful recruitment which would indicate successful establishment of a population of breeding NP in the Robson Reach. Additionally, another objective of this study is to confirm the most effective NP larvae sample techniques for a larger river system like the Columbia River. A variety of methods will be deployed during this study( i.e. light traps, minnow traps, backpack shocking, beach seining, and plankton tow) to ascertain their potential to use in future abundance and distribution studies in this area.