With opening falling on a weekday during the school holidays, retirees and school children were out in force.
Water levels were ideal at Lake Opuha, with most anglers catching 1kg-1.3kg brown trout.
Central South Island Fish & Game rangers said about 30 anglers fished the lake from boat and shore, a relatively low number compared with recent openings.
At the Rangitata River, anglers fishing with worm bait were the most successful.
A small number of anglers were checked on at the Ōrāri and Pareora rivers.
Anticipation for Pareora was high as some fish seen appeared to be quite large but were proving difficult to catch.
The relatively low river allowed shoreline anglers easy access and most had hooked a fish by lunchtime.
The fishing season for local fisheries, like Ōpihi River and Lake Opuha remains open until April 30.
Many high country rivers and lakes remain closed until their opening day on the first Saturday in November (2).
This includes Lake Alexandrina and the Hakataramea River.