Jellyfish threaten to ‘dominate’ oceans

Giant jellyfish are taking over parts of the world’s oceans due to overfishing and other human activities, researchers say. Dr Anthony Richardson and his colleagues from CSIRO Marine and Atmospheric Research says jellyfish numbers are increasing, particularly in South East Asia, the Black Sea, the Gulf of Mexico and the North Sea. Jellyfish are normally kept in check by fish, which eat small jellyfish and compete for jellyfish food such as zooplankton, he says. But with overfishing, jellyfish numbers are increasing. Jellyfish feed on fish eggs and larvae, further impacting on fish number.  Full Story : Abc.net.au…..