Plankton blooms are common in a number of nutrient-rich freshwater lakes in the North Island. This photograph shows a plankton bloom in the right side of Lake Ōrākai, Hawke's Bay, and clear water in the left. Silver carp introduced into the left side were able to eat much of the plankton.
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Fisheries New Zealand
Reference: A. D. Carruthers, Effect of silver carp on blue-green algal blooms in Lake Orakai. Napier: N. Z. Ministry of Agriculture and Fisheries, 1986, p. 19
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