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1 September 2015 Could High Salinity Be Used to Control Bullfrogs in Small Ponds?
David L. Ward, Colton Finch, Heidi Blasius
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Abstract

We examined survival of bullfrog (Rana catesbeiana) eggs and tadpoles at 3 ppt and 6 ppt salinity in the laboratory to determine if low-level salinity could be used to eradicate bullfrogs from small ponds that contain native fishes. Bullfrog eggs and tadpoles <10 days old experienced 100% mortality when held at 6 ppt salinity for 10 days. Bullfrog tadpoles 10–15 days old experienced significantly reduced survival when exposed to salinity of 6 ppt for 10 days. Older bullfrog tadpoles (>9 months old) appeared unaffected by 14 days of 6 ppt salinity. Salinity of 3 ppt did not impact survival of bullfrog tadpole eggs or tadpoles at any of the life stages we tested. Adding salt to ponds in the early spring to increase salinity to 6 ppt may be a cost effective way to eradicate bullfrogs from small ponds without harming native fishes.

David L. Ward, Colton Finch, and Heidi Blasius "Could High Salinity Be Used to Control Bullfrogs in Small Ponds?," Journal of the Arizona-Nevada Academy of Science 46(2), 50-52, (1 September 2015). https://doi.org/10.2181/036.046.0203
Published: 1 September 2015
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