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

    How different voting systems work around the world

    How different voting systems work around the world

    Nearly two billion voters in 52 countries around the world will head to the polls this year to elect their leaders.

    How Moscow lost Riyadh in 1938

    How Moscow lost Riyadh in 1938

    Russian-Saudi relations could be very different today, if Stalin hadn't killed the Soviet ambassador to Saudi Arabia.

    The great plunder: Nepal's stolen treasures

    The great plunder: Nepal's stolen treasures

    How the art world's hunger for ancient artefacts is destroying a centuries-old culture. A journey across the Himalayas.