Quantitative assessments of high-resolution telemetry data reveal behavior and movement of bighead and silver carp are impacted by a carbon dioxide barrier in outdoor ponds

Resource managers need effective methods to limit the spread of invasive Asian carps (Hypophthalmichthys spp.) into new areas. This study evaluated carbon dioxide (CO2) as a barrier and deterrent to Asian carps in a small outdoor pond. Telemetered silver carp (Hypophthalmichthys molitrix) and bighead carp (Hypophthalmichthys nobilis) were monitored for 72h (24h before CO2, 24h during CO2, 24h after CO2) using a two-dimensional acoustic telemetry array to evaluate behavioral responses to CO2. Water quality was measured concurrent with acoustic telemetry to determine the concentration and extent of the CO2 plume. Results are intended to provide information on the potential application of CO2 as an invasive fish deterrent strategy.