Brits have been warned of the risk of an invasion of Chinese mitten crabs - crustaceans that can damage riverbanks, have a negative impact on the fishing industry and give a painful bite if threatened.

Source: https://www.lincolnshirelive.co.uk/news/local-news/first-uk-trap-chinese-mitten-8834358

But the chemicals can be harmful to some fish, frogs, crustaceans and other aquatic species.

Source: https://www.abqjournal.com/2601977/judge-says-fire-retardant-drops-are-polluting-streams-but-allows-use-to-continue.html

Pictured: The bony mouth of the sheepshead is used to crush crustaceans.

Source: https://mulletwrapper.net/alabama-anglers-land-11-record-setting-saltwater-fish-in-2022/

There, krill — small crustaceans that form the basis of the ocean food chain — eat them and become infected with larval stages of the nematodes.

Source: https://www.salon.com/2023/04/18/how-to-be-smart-when-it-comes-to-ordering-cooking-and-eating-raw-fish--_partner/

The Wildlife Trusts said: "They are fearsome predators, catching small fish and crustaceans with their long stinging tentacles.

Source: https://www.dailystar.co.uk/news/latest-news/fearsome-ocean-predators-lurking-uk-30785426