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Providing evidence to improve practice

Action: Ponto-Caspian gobies: Changing salinity Control of Freshwater Invasive Species

Key messages

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  • A replicated, controlled laboratory study in Canada found 100% mortality of round gobies within 48 hours of exposure to water of 30% salinity.


Supporting evidence from individual studies


A replicated, controlled laboratory study from 2006 to 2007 at the Great Lakes Institute for Environmental Research in Canada (Ellis & McIsaac 2009) found that round gobies Neogobius melanostomus cannot survive for more than two days in water with 30% salinity. All fish survived five hours in water of 30% salinity. It did not make a difference if the water became salty gradually or immediately. Up to about a fifth of the fish were still alive after 24 hours. However, after 48 hours, all fish were dead.  Gobies were taken from a river in Canada.  Ten gobies were put in each of 12 aquaria containing 16 litres of filtered river water. The water in four of the aquaria had 30% salinity from the beginning. The salinity in another four aquaria was 4% at the start of the experiment and increased every hour to 8, 14, 24 and 30%. Every hour for five hours, and after 24 and 48 hours, dead gobies were removed and counted.

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.