Quagga mussel (Dreissena rostriformis bugensis) colony. This freshwater mussel is native to Eastern Europe. It was first detected in the US in 1989. It is an aggressive invasive species that kills and out-competes other mussels and alters the local environment. It is a prolific breeder, with females able to produce one million eggs per day. Its large colonies can block pipes and cause damage to infrastructure and boats. Photographed at Parker Dam on the Colorado River, at the California/Arizona border, USA.
July 24th, 2016
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