<i>Proteobacteria</i> and <i>Bacteroidetes</i> are major phyla of filterable bacteria passing through 0.22 μm pore size membrane filter, in Lake Sanaru, Hamamatsu, Japan

141 filterable bacteria that passed through a 0.22 μm pore size filter were isolated from Lake Sanaru in Hamamatsu, Japan. These belonged to <i>Proteobacteria</i>, <i>Bacteroidetes</i>, <i>Firmicutes</i>, or <i>Actinobacteria</i> among which the first two phyla comprised the majority of the isolates. 48 isolates (12 taxa) are candidates assignable to new bacterial species or genera of <i>Proteobacteria</i> or <i>Bacteroidetes</i>.