Introduction
The UK is facing a growing population of Chinese mitten crabs, an invasive species that has the potential to cause significant environmental damage. These crustaceans, native to East Asia, are known for their distinctive furry claws and can be found in freshwater habitats. They pose a threat to the ecosystem by burrowing into river beds, blocking waterways, and competing with native species for resources.
Invasive Species in the UK
Chinese mitten crabs were first spotted in the UK in 1935 in the river Thames and have since spread to other waterways across the country. There has been a recent surge in sightings in Cambridgeshire, raising concerns about the growing population. To address this issue, the Natural History Museum and the UK Department for Food, Agriculture and Rural Affairs have launched initiatives to encourage the public to report sightings and help track the crab population.
The Impact and Control Measures
Chinese mitten crabs have the ability to reproduce rapidly, with adult females producing multiple spawnings of eggs. This contributes to the increase in their population. To tackle the rising numbers, various organizations have taken measures such as installing the first permanent Chinese mitten crab trap in Lincolnshire. By trapping and monitoring the crabs, it is hoped that their population can be managed effectively.
Edible Delicacy and Health Concerns
Despite being an invasive species, Chinese mitten crabs are considered a delicacy in China, particularly during the autumn season. They are served steamed whole with vinegar and can reach high prices in the market. While they are safe to consume, there are health concerns related to the presence of bacteria and pollutants in their bodies. Some studies have found high levels of bacteria and chemicals in crabs from the river Thames, highlighting the need for caution when consuming them raw or lightly cooked.
