Fish & Game officers are preparing to quiz more than 1000 anglers about their fishing habits on opening day as the new fishing season gets underway on Rotorua's lakes.
Lakes Tarawera, Okataina and Rotoiti will reopen after a three month shutdown for spawning over winter, with more than 1200 anglers expected to try their luck.
Fish & Game officers use opening day as a major data-gathering opportunity.
They stake out boat ramps and take to the water to survey hundreds of anglers on their fishing success and methods, and weigh and measure fish.
This season the lure of a fish with a $25,000 prize tag is expected to push numbers up.