Differential infection of exotic and native freshwater amphipods by a parasitic water mould in the St. Lawrence River

  • Published source details Kestrup A.M., Thomas S.H., van Rensburg K., Ricciardi A. & Duffy M.A. (2011) Differential infection of exotic and native freshwater amphipods by a parasitic water mould in the St. Lawrence River. Biological Invasions, 13, 769-779.


This study is summarised as evidence for the following.

Action Category

Ponto-Caspian gammarids: Exposure to parasites

Action Link
Control of Freshwater Invasive Species
  1. Ponto-Caspian gammarids: Exposure to parasites

    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.

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