Targeting aggregations of telemetered Lake Trout to increase gillnetting suppression efficacy

North American Journal of Fisheries Management
By: , and 



Conserving Yellowstone Cutthroat Trout Oncorhynchus clarkii bouvieri by suppressing invasive Lake Trout Salvelinus namaycush in Yellowstone Lake is a high priority for Yellowstone National Park resource managers. Here, we tested whether targeting telemetered Lake Trout could increase the efficacy of Lake Trout suppression by gill netting. Mobile acoustic tracking surveys were performed to identify aggregations of tagged Lake Trout in summer (June–August) 2017. Lake Trout aggregations were relayed daily to suppression crews by phone, radio, or text and a printed map. Suppression crews set 30 large-mesh gill nets targeting telemetered Lake Trout aggregations (target treatment) and 124 large-mesh gill nets not targeting telemetered aggregations (nontarget treatment). Mean loge(CPUE) was higher for the target treatment (0.37; 95% credible interval [CRI] = 0.08–0.65) than for the nontarget treatment (−0.37; 95% CRI = −0.51 to −0.21). Mean of the target treatment was higher than the mean of the nontarget treatment for over 99% of the 1,000 draws from the joint posterior distribution. Because of telemetry costs, mean CPUE per US$10,000 spent was similar between the target treatment (0.20; 95% CRI = 0.15–0.26) and the nontarget treatment (0.15; 95% CRI = 0.13–0.17). Telemetry is an effective strategy for improving Lake Trout CPUE, which corresponds to an increased efficiency in the Lake Trout suppression program.

Study Area

Publication type Article
Publication Subtype Journal Article
Title Targeting aggregations of telemetered Lake Trout to increase gillnetting suppression efficacy
Series title North American Journal of Fisheries Management
DOI 10.1002/nafm.10401
Volume 40
Issue 1
Year Published 2020
Language English
Publisher Wiley
Contributing office(s) Montana Cooperative Fishery Research Unit
Description 7 p.
First page 225
Last page 231
Country United States
State Wyoming
Other Geospatial Yellowstone Lake, Yellowstone National Park
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