Biological Invasions

, Volume 19, Issue 6, pp 1739–1744

Unexpected survival of sharptooth catfish Clarias gariepinus (Burchell 1822) during acute rotenone toxicity trials will complicate management of invasions

  • Martine S. Jordaan
  • Tatenda Dalu
  • Ryan J. Wasserman
  • Etienne Slabbert
  • Olaf L. F. Weyl
Invasion Note

Abstract

The sharptooth catfish Clarias gariepinus is an emerging global invader for which control strategies might include the use of piscicides such as rotenone. Experimental exposure demonstrated that C. gariepinus was less susceptible to rotenone than most other fish species, with unexpected survival observed at rotenone concentrations of 87.5 and 100 µg L−1. C. gariepinus were also observed exhibiting avoidance behaviour to rotenone treated water and were found to be capable of recovering from rotenone exposure. As such, effective eradication might not be attainable even at a dose exceeding 100 µg L−1 with exposures of longer than 24 h. This exposure scenario may pose an unacceptable risk to non-target fauna and highlights the difficulty associated with managing current and future invasions.

Keywords

Acute toxicity Behaviour effects Biodiversity restoration Global invader Invasions Rotenone 

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Copyright information

© Springer International Publishing Switzerland 2017

Authors and Affiliations

  1. 1.CapeNature Scientific ServicesStellenboschSouth Africa
  2. 2.South African Institute for Aquatic BiodiversityGrahamstownSouth Africa
  3. 3.Department of Zoology and EntomologyRhodes UniversityGrahamstownSouth Africa
  4. 4.School of ScienceMonash University MalaysiaBandar SunwayMalaysia
  5. 5.Central Analytical FacilityStellenbosch UniversityStellenboschSouth Africa
  6. 6.Centre for Invasion BiologySouth African Institute for Aquatic BiodiversityGrahamstownSouth Africa

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