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Introduced European carp now outnumber native fish in the rivers of New South
Wales, a two-year study has found. Some reaches of the Murray-Darling river
system contain one carp per square metre. And although some 55 000 fish were
sampled, 16 native species were not detected at all. Scientists with the New
South Wales Fisheries Research Institute say that dams and irrigation projects
have altered river flows, favouring the carp.