Adult Pacific Lamprey Migration in the Columbia and Snake Rivers

Résumé du livre

The 2013 adult Pacific lamprey studies used an integrated set of technologies to address multiple questions about Pacific lamprey (Entosphenus tridentatus) migration in the Columbia River Hydrosystem at a variety of scales. Our objectives were to calculate lamprey passage times through various river reaches, to estimate escapement past the monitored sites, and to evaluate potential correlations between lamprey migration and physiological factors. The results summarized in this report primarily address reach-scale and system-wide migration using detection data from lamprey tagged with half duplex (HD) passive integrated transponder (PIT) tags. The multi-year HD-PIT dataset provides baseline data for understanding migration-scale questions about adult Pacific lamprey and for evaluating changes in lamprey passage performance in the hydrosystem. The HD-PIT monitoring complements ongoing active telemetry and experiments to test lamprey behavior at main stem dams. Companion 2013 study reports provide results from lampreys tagged with acoustic transmitters (JSATS) and released upstream and downstream from Bonneville Dam (Noyes et al. 2014), behaviors of the HD-PIT tagged fish in and near Bonneville lamprey passage structures and other modifications (Corbett et al. 2014), and results from using dual frequency identification sonar (DIDSON) to monitor adult lampreys inside and near fishways at Bonneville and John Day dams (Kirk et al. 2014). -- Executive summary, pages v-vi.