ICE GOBY (SHIRO-UO), LEUCOPSARION PETERSII, MAY BE A USEFUL MATERIAL FOR STUDYING TELEOSTEAN EMBRYOGENESIS

The highly diverse Perciformes are the most numerous and most advanced group of the teleosts, but experimental embryology has almost complet ely neglected them. The ice goby (shiro-uo), Leucopsarion petersii, de serves attention as a useful species for this purpose. It is readily a vailable commercially from fishermen, and their mature adults can be e asily kept and bred in the laboratory. Its totally transparent eggs an d embryos develop swiftly and easily under simple culture conditions. Cleavage is finished in 17 hr at 20 degrees C and most organs are esta blished in 3 clays. Main stages of embryonic development and methods o f handling are described.