Possible competitive exclusion of common river galaxias(Galaxias vulgaris)by koaro(G. brevipinnis)following impoundment of the Waipori River, Otago, New Zealand

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Abstract
Common river galaxias (Galaxias vulgaris) are apparently absent from the Waipori River above Lake Mahinerangi, but widespread elsewhere in the Taieri River system including tributaries just below the dam. Koaro (G. brevipinnis) abound in tributaries of Lake Mahinerangi, but are rare in the Taieri River. We hypothesise that koaro have replaced common river galaxias in streams above the Mahinerangi Dam since it was built.