A number of fish have shown up dead as a result of drying up riverbeds in the wider Marlborough region.
It comes after concerns from Fish and Game Nelson Marlborough earlier this week over the effects of warmer temperatures on freshwater species.
Fish and Game regional manager Rhys Barrier told 1 NEWS as water levels recede, fish are becoming trapped in small pools of water with nowhere to go.
"26C will end up killing brown trout if they're in it too long," Mr Barrier said.
On Friday, Fish and Game staff visited the Opouri tributary of the Rai River, where they spotted several dead fish which were being "cleaned up" by hawks and shags.
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The Rai River has been below its minimum flow levels for the past week.
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