Crayfish help Russia to monitor pollution

Scientists in St Petersburg are using crayfish and snails to monitor pollution levels.

    Scientists in St Petersburg, Russia have been using crayfish and snails to monitor pollution levels.

    The heart-rate stress of the crayfish and snails are monitored and compared to levels recorded before putting the crustaceans into potentially polluted environments.

    The crayfish are put into the river Neva while the snails breathe air from an incinerator which burns St Petersburg's sewage. These creative methods are vital to the protection of the city's four million people.

    Al Jazeera's Barnaby Phillips reports from St Petersburg.

    SOURCE: Al Jazeera


    YOU MIGHT ALSO LIKE

    Interactive: Take a tour through divided Jerusalem

    Interactive: Take a tour through divided Jerusalem

    Take a tour through East and West Jerusalem to see the difference in quality of life for Israelis and Palestinians.

    Stories from the sex trade

    Stories from the sex trade

    Dutch sex workers, pimps and johns share their stories.

    Inside the world of India's booming fertility industry

    Inside the world of India's booming fertility industry

    As the stigma associated with being childless persists, some elderly women in India risk it all to become mothers.