The finding of Dikerogammarus haemobaphes, which is a relative of Dikerogammarus villosus in the River Severn plus the Worcester and Birmingham Canal, has sent shudders through environmentalists and anglers.
It is believed the invasive non-native species that has spread from Eastern Europe had spread over a distance of more than 20 miles.
Killer shrimp are voracious predators that kill a range of native species particularly juvenile fish the impacts its close relative may have are uncertain.
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