This classic and award winning clip from the movie “Once in a Blue Moon” documents one of New Zealand’s rarest fly fishing phenomena, the mouse hatch. In an unpredictable cycle of physical conditions, there is a massive flowering of New Zealand’s beech trees. This creates an overabundance of seeds, which leeds to an explosion in the rodent population. With so many mice around, big brown trout continuously gorge themselves aggressively on mouse after mouse. Behind the lens are husband and wife team Carl McNeil and Jeannie Ackland, who successfully documented this incredible natural event.