Pseudoblennius percoides Gunther is a marine sculpin, commonly found on the shallow rocky coast of Japan. The author operated artificial insemination of this fish on December 7, 1955, at the Mekari Aquarium in Moji City, Kyushu, and observed egg development and hatched larvae (P1. 1～12). The eggs are sticking to each other and laid in an egg mass, not adhering to other substances. The egg is bluish green or yellowish green, spherical in shape measuring 1.6～2.0 mm in diameter with several colorless oil globules measuring 0.05～O.3 mm which become united into a single one in the course of development. Hatching took place in about 17 days at the water temperature 16.2-18.6℃. Newly hatched larva is 5.6 mm in total length with several melanophores and xanthophores. Some larvae lack the melanophores on the tail. The myotome number is 10-.41+29=39-40 (vertebral number of this fish is 13+24=37). In one day after hatching many melanophores appeared on the tail . In 4 days the yolk is almost consumed.
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