A shrimp (Dikerogammarus haemobaphes), which is a relative of the so-called 'killer shrimp' has been found on the River Severn at Tewkesbury and Bevere near Worcester and on two canals in Worcestershire. It is the first time it has been found in this country.
According to the Department for the Environment, Food and Rural Affairs (Defra) the ) is "a voracious predator [which] kills a range of native species, including young fish, and can significantly alter ecosystems".
But the Environment Agency is unsure what the impact of this new species will be. They say until they have further information it will be treated as a "high impact species" and have a team working to establish how far the shrimp has spread along the river.
More top news
Mainly dry with clear spells but possibly one or two light showers near coasts overnight, remaining largely dry on Sunday.
After a cool start, Sunday looks set to be a dry and bright day, with sunny spells.
A mother from Birmingham has issued a warning after her daughter, 4, was bitten by a spider.