Ayukai,-T. Standing stock of microzooplankton on coral reefs: A preliminary study. J.-PLANKTON-RES. 1991. vol. 13, no. 4, pp. 895-899. The standing stock of microzooplankton on mid-shelf coral reefs in the central Great Barrier Reef was investigated based on samples collected with a Niskin bottle in Feb and Oct 1989. The observed net decrease in standing stock of microzooplankton across the reef flat suggests that a lack of information on their standing stock on coral reefs has led to an underestimate of the allochthonous energy input to coral reef systems.