This female rainbow trout was running upstream to spawn at Tokaanu in 1983 and was caught in a fish trap. It was stripped of roe (eggs), which were used in a hatchery together with milt (sperm) from males caught in the trap to produce fingerling trout. For many decades trout hatcheries were an important part of freshwater fisheries management. Today, however, most populations of trout are self-sustaining and hatchery releases are only done in waterways that lack good spawning areas.
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Department of Conservation
Photograph by Bob Bedingfield
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