sourceTaxonName: Gymnocephalus cernua
targetTaxonName: Gammarus zaddachi
localityName: Germany|Elbe River Estuary.
referenceCitation: Hölker, F. and C. Hammer. 1994. Growth and food of the ruffe <i>Gymnocephalus cernuus</i> (L.) in the Elbe estuary. Arch. Fish. Mar. Res. 42(1):47-62.