Conservation Evidence strives to be as useful to conservationists as possible. Please take our survey to help the team improve our resource.

Providing evidence to improve practice

Action: Procambarus crayfish control: Sterilization of males Control of Freshwater Invasive Species

Key messages

Read our guidance on Key messages before continuing

  • One replicated laboratory study in Italy found that exposing male red swamp crayfish to X-rays reduced the number of offspring they produced by 43%.


Supporting evidence from individual studies


A replicated laboratory study conducted between 2005 and 2006 in Italy (Aquiloni et al. 2009) found that male red swamp crayfish Procambarus clarkii, exposed to X-rays had a reduced reproductive ability. The number of offspring they successfully produced was reduced by 43% compared to a control group (no x-ray exposure). X-ray exposure did not affect the males’ survival and mating abilities. Irradiated males had smaller testes and altered sperm production that lasted for at least a year. A total of 122 males were tested, half in a control group with no irradiation. Male crayfish were placed individually inside a plastic tube and exposed to a 6 MeV electron beam for five minutes. Testes and sperm production were measured, as were the number of viable offspring produced post-mating.


Referenced papers

Please cite as:

Aldridge, D., Ockendon, N., Rocha, R., Smith, R.K. & Sutherland, W.J. (2019) Some aspects of control of freshwater invasive species. Pages 569-602 in: W.J. Sutherland, L.V. Dicks, N. Ockendon, S.O. Petrovan & R.K. Smith (eds) What Works in Conservation 2019. Open Book Publishers, Cambridge, UK.