“…To maintain the reproduction and propagation of natural living resources, it is important to understand the reproductive biology associated with oocyte differentiation and yolk formation (vitellogenesis) during oogenesis. However, comprehensive ultrastructural studies of teleost fish oogenesis by observations from electron microscopy in Korea have been reported for a relatively small number of species, mainly those of economic importance, including Agrammus agrammus ( Chung & Lee, 1985 ), Sebastes schlegeli ( Chung & Chang, 1995 ), Hexagrammos otakii ( Kang et al., 2004 ) and Boleophthalmus pectinirostris ( Chung et al, 2009 ). To date, there have been several studies on reproduction in K. bicoloratus , including reproductive ecology ( Jun 2003 ; Jun et al, 2006 ), egg and larval development ( Kim, 1982 ; Kim & Han, 1989 ; Han & Kim, 1997a ; Jun et al, 2002 ) and growth and maturity ( Mori et al., 1986 ; Chen et al, 1992 ; Uehara & Shimizu, 1999 ), and egg and larval development ( Minami, 1984 ; Jun et al, 1999a ).…”