Even successful anglers could be taking home fewer trout and salmon from some waterways this fishing season, beginning on October 1.
The Otago Fish and Game Council is introducing a new set of regulations with new bag limits to ensure fish stocks are maintained.
Fish and game officer Cliff Halford said the changes had been approved by the Minister of Conservation and were made after consultation with angling groups earlier this year.
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They were designed to take account the increased population in the lakes region, and the "degradation of many lowland streams with declining fish numbers", Mr Halford said.