Story: Life in fresh water

Junction of Kawarau and Clutha

Junction of Kawarau and Clutha

These two images show the town of Cromwell at the junction of the Kawarau and Clutha rivers in 1903 (top) and 2005. Built in the late 1980s, the Clyde Dam impounded the two rivers, producing Lake Dunstan in 1993. Hydroelectric schemes have altered many New Zealand river catchments. Dams remain one of the major threats to freshwater ecosystems. They obstruct the pathways of fish, and few invertebrates can cope with the fluctuations in river levels downstream (caused by releasing more water to generate more power, when demand surges in the evenings).

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How to cite this page:

Roger Young, 'Life in fresh water - Factors affecting life in fresh water', Te Ara - the Encyclopedia of New Zealand, (accessed 14 June 2024)

Story by Roger Young, published 24 Sep 2007