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Early Gonadogenesis and Sex Differentiation of a Marine Medaka, Oryzias dancena (Beloniformes; Teleostei)  

Song, Ha Yeun (Department of Aquaculture, Pukyong National University)
Nam, Yoon Kwon (Institute of Marine Living Modified Organisms (iMLMO), Pukyong National University)
Bang, In-Chul (Department of Marine Biotechnology, Soonchunhyang University)
Kim, Dong Soo (Institute of Marine Living Modified Organisms (iMLMO), Pukyong National University)
Publication Information
Korean Journal of Ichthyology / v.21, no.3, 2009 , pp. 141-148 More about this Journal
Abstract
Sex differentiation and gonad development were investigated in a marine medaka species, Oryzias dancena (Beloniformes; Teleostei). The average time to hatch was 11 days post-fertilization (dpf) at $25^{\circ}C$. Primordial germ cell (PGC) was first observed at 5 dpf and migrated to presumptive gonadal area between the gut and pronephric duct at 9 dpf. Male and female gonads were morphologically differentiated at 12 days post-hatching (dph). Early oocytes at perinucleolus stage as well as the formation of spermatid and efferent duct were observed at 28 dph. At 6 weeks of age, the ovary exhibited yolk granulation in many oocytes, while testis possessed a considerable number of spermatogonia and spermatids. The first ovulation was observed in 9-week-old females, and at the same age, males contained fully-matured spermatozoa. Data obtained in this study indicate that the gonad differentiation of O. dancena is the typical type of differentiated gonochorism.
Keywords
Gonad development; gonochoristic type; Oryzias dancena; sex differentiation;
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