Chaeturichithys hexanema Bleeker is widely distributed in Japan, Korea, and Southern China. It is one of the common sea gobies in Japan throughout. It lives the bottom-life on the sandy mud-bottom of the coastal water of some 5～50 meters deep. It is caught mainly by the small trawl-net all the year round (Fig. 1). The spawning season seems to extend from February to May in Kyushu and Seto Island Sea. The fertilized egg by artificial insemination is ellipsoid, 2.9 mm in long axis and 0.8 mm in short axis; and has adhesive filaments at its basal end. The incubation-period is about 10*1/2 days at the temperature 14～17℃ (Fig. 2). The number of the ovarian eggs is given in Table 1 (1,731～19,258). The newly hatched larva is 4.2 mm in total length; and the yolk is absorbed in 7 days. The larvae, 10.8～24.0 mm in total length, live a pelagic life in the coastal water where the adult fish live, feeding on planktonic copepods. The juveniles, over 21 mm in total length, are found to carry the bottom-life. They appear from May to June in Fukuoka Bay, Kyushu (Fig. 3). The goby attains about 135 mm in total length in one year and becomes mature. In two years, it attains the length of 155 mm. The life-span seems to be over three years.
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