This is a juvenile Eumicrotremus uenoi lumpsucker, estimated length 3mm from head to tip of caudal fin. Adults of this species are generally a single color, losing the white rings that characterize the juveniles. This fish is sitting on Colpomenia sinuosa algae. The white crystals are grains of sand, which provide a sense of scale. This species is found in the North Pacific, on the western coast of Japan and southern coast of the Korean peninsula. Photographed at magnification of four times life-size.
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