Egg Size Difference among Three Populations of the Goby, Tridentiger obscurus

Abstract

Tridentiger obscurus (Temminck et Schlegel) is a common goby which lives in estuaries, rivers, ponds and lakes in Japan (Nakamura, 1942; Okada, 1960: 654).In recent years Katsuyama et al. (1972) proposed that this species can be classified into two subspecies, T.o.obscurus and T.o.brevispinis, based on some morphological differences.In the present study, I investigated the size of eggs and larvae of these two types of T. obscurus during the summer of 1976.