Overview: `Jellyfish‘, a group that includes scyphomedusae, hydromedusae,siphonophores and ctenophores, are important zooplankton predatorsthroughout the world‘s estuaries and oceans. These beautiful creatureshave come to public attention as featured exhibits in aquaria and innews headlines as invaders and as providers of genes used inbiomedical research. Nevertheless, jellyfish are generally consideredto be nuisances because they interfere with human activities bystinging swimmers, clogging power plant intakes and nets of fishermenand fish farms, and competing with fish and eating fish eggs a
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