This rainbow trout from a tributary stream of Lake Rotoiti, near Rotorua, shows markings typical of spawning fish – crimson on the gills and sides, with a greyish-yellow background. Lake-dwelling rainbow trout are more silvery, often with dark olive-green on the back. Within days of their swimming upriver to spawn, the silver changes – as seen here.
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New Zealand Herald
Reference:
290905NZHAGTROUT01.JPG
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