All photographs © Julie Conrads, unless otherwise noted. Please contact me before reuse. Quagga mussels at 15 m depth, Lake Constance · © Christoph Walcher, Eawag Dense quagga mussel colony, Lake Constance · © Christoph Walcher, Eawag Quagga mussels on a harbour post, Bottinghofen, Lake Constance Quagga mussels covering rocks, Bielersee Quagga mussel shells at ~40 m depth, Lake Constance Benthic macroinvertebrate survey, Lake Zurich Benthic macroinvertebrate survey, Lake Zurich Benthic macroinvertebrate survey, Lake Zurich Benthic macroinvertebrate survey, Lake Zurich Benthic macroinvertebrate survey, Lake Zurich Benthic macroinvertebrate survey, Lake Zurich Benthic macroinvertebrate survey, Lake Zurich Benthic macroinvertebrate survey, Lake Zurich Benthic macroinvertebrate survey, Lake Zurich Benthic macroinvertebrate survey, Lake Zurich Benthic macroinvertebrate survey, Lake Zurich Benthic macroinvertebrate survey, Lake Zurich Benthic macroinvertebrate survey, Lake Zurich Benthic macroinvertebrate survey, Lake Zurich Benthic macroinvertebrate survey, Lake Zurich Benthic macroinvertebrate survey, Lake Zurich Benthic macroinvertebrate survey, Lake Zurich Benthic macroinvertebrate survey, Lake Zurich Benthic macroinvertebrate survey, Lake Zurich Benthic macroinvertebrate survey, Lake Zurich
