The rnacrophyte communities present in Lake Parkinson (37°19'S 174O41'E), a 1.9 ha eutrophic sand‐dune lake, are described 5 years after removal of grass carp(Ctenopharyngodon idellaVal; 218 kg ha−1). Eradication of the adventive submerged speciesEgeria densaPlanchon (dependenton vegetative reproduction from stem fragments) as a result of grass carp stocking led to the re‐establishment of a predominantly native macrophyte association from seeds, spores, and buried rhizomes after grass carp removal. EmergentEleocharis sphacelataR. Br. re‐established around the lake margins and throughout the lake's shallow southwestern arm, whereas submerged communities domin ated byPotamogeton ochreatusRaoul andNitella hookeriA. Br. grew to a maximum depth of 5 m.