Abstract
This investigation was carried out by using a new type of bottom sampler with a circular quadrat (0.08 m2) for analyzing the number of replicate samples required to estimate the species number, density and biomass of zoobenthos along a shallow shore of Lake Haruna, Gunma Prefecture, in August 1978. In the shallow part of stony zone where the samples presented a poor fauna and a large variation, a vast number of replicate samples are required to estimate the total number of taxa and individuals, and total biomass, whereas, in the deeper stony zone (about 2 meters offshore) and aquatic plant zone with an abundant fauna and a smaller variation of samples, about six replicate samples are required to estimate the number and the biomass at 30% level of permissible error and 95% level of confidence of the mean. The species showing a low density and an aggregated distribution requires a large number of samples.
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