Ponto-Caspian gammarids: Change water pH
Overall effectiveness category Unlikely to be beneficial
Number of studies: 1
Background information and definitions
Making the water more acidic (lowering the pH) through the use of chemicals may kill gammarid shrimps because their exoskeletons are likely to be dissolved by the acid. Prolonged exposure to acidic water may affect the ability of the shrimps to lay down new exoskeletons and to moult.
Supporting evidence from individual studies
A controlled laboratory study in 2011 in England, UK1 (Stebbing et al. 2011) found that lowering the pH of water did not kill the killer shrimp Dikerogammarus villosus. None of the shrimp died during the test period. Tests were conducted on 5 captive shrimp immersed for 15 minutes in de-chlorinated water of different pH values. Values ranged from pH 7.2-3.1. Hydrochloric acid was used to adjust the pH of the test solutions. Dead and live shrimp were counted.Study and other actions tested