Red-eared terrapin: Direct removal of adults

How is the evidence assessed?
  • Effectiveness
  • Certainty
  • Harms
    not assessed

Study locations

Key messages

  • A replicated field study in Spain found that Aranzadi turtle traps were effective in trapping red-eared terrapins from a river but did not eradicate the population.
  • A study in the British Virgin Islands found that using sein nets to trap adults and juveniles was not successful in eradicating the population.


About key messages

Key messages provide a descriptive index to studies we have found that test this intervention.

Studies are not directly comparable or of equal value. When making decisions based on this evidence, you should consider factors such as study size, study design, reported metrics and relevance of the study to your situation, rather than simply counting the number of studies that support a particular interpretation.

Supporting evidence from individual studies

  1. A replicated field study conducted in 2008, in the Arga River, Spain (Valdeón et al. 2010) found that modified Aranzadi turtle traps were effective at trapping red-eared terrapin Trachemys scripta elegans and Trachemys scripta scripta but did not eradicate the populations, and that these traps performed better than modified Bolue traps, and fish-baited traps, which trapped very few terrapins.   The modified Aranzadi turtle traps caught an average of 70% of observed terrapins.  During five months of spring and summer 2008, one of each of the three trap types was set in each of two areas of the Arga River, Spain.  On separate dates, one of each trap type was also set in 11 different water bodies.  The baited traps were visited on consecutive days, while basking traps were checked weekly during five months of spring and summer of 2008.

    Study and other actions tested
  2. A study in 2003 in a pond at botanic gardens in Tortola, British Virgin Islands (Perry et al. 2007) found that using sein nets to trap red-eared terrapin Trachemys scripta adults and juveniles was not successful in eradicating the population.  Twelve adults and approximately twenty juveniles were removed.  Additional capture efforts removed further adults and juveniles in July and October 2004.  Experimental methods were not available.

    Study and other actions tested
Please cite as:

Aldridge, D., Ockendon, N., Rocha, R., Smith, R.K. & Sutherland, W.J. (2020) Some Aspects of Control of Freshwater Invasive Species. Pages 555-87 in: W.J. Sutherland, L.V. Dicks, S.O. Petrovan & R.K. Smith (eds) What Works in Conservation 2020. Open Book Publishers, Cambridge, UK.

Where has this evidence come from?

List of journals searched by synopsis

All the journals searched for all synopses

Control of Freshwater Invasive Species

This Action forms part of the Action Synopsis:

Control of Freshwater Invasive Species
Control of Freshwater Invasive Species

Control of Freshwater Invasive Species - Published 2017

Control of Freshwater Invasive Species Synopsis

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What Works in Conservation

What Works in Conservation provides expert assessments of the effectiveness of actions, based on summarised evidence, in synopses. Subjects covered so far include amphibians, birds, mammals, forests, peatland and control of freshwater invasive species. More are in progress.

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