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: Ponto-Caspian gammarids: Exposure to parasites Control of Freshwater Invasive Species

Key messages

Read our guidance on Key messages before continuing

  • A replicated, laboratory study in Canada found that an introduced parasitic mould reduced populations of an invasive shrimp.


Supporting evidence from individual studies


A replicated, controlled laboratory study in 2011 in Canada (Kestrup et al. 2011) found that a parasitic water mould (oomycete) of unknown origin infected and killed invasive gammarids Echinogammarus ischnus. Invasive shrimps exposed to water carrying the mould had a 52% mortality rate after seven days, compared with 16% mortality in native shrimps. Laboratory tests used 20 replicate aquaria each containing 10 invasive and 10 native (Gammarus faciatus) shrimps. Two litres of river water was placed in each aquarium from the St. Lawrence River, which was the location of the mould’s original discovery.  Aquaria were checked twice daily for seven days and dead individuals were removed.

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.