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Embryogenesis and Early Ontogenesis of a Marine Medaka, Oryzias dancena  

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.4, 2009 , pp. 227-238 More about this Journal
Abstract
The egg development and morphological changes of larvae, juveniles and adults of Oryzias dancena were observed. Fertilized eggs were incubated at $25{\pm}1^{\circ}C$; the process of embryonic development was observed by light microscopy and based on diagnostic features of the developing embryos. The average time to hatch was 11 days after fertilization. The hatched larvae averaged $4.40{\pm}0.24mm$ in total length (TL). The yolk sacs of the larvae were almost absorbed at 3 days after hatching and $4.55{\pm}0.23mm$ TL. At 21 days after hatching, the larvae were $7.23{\pm}0.73mm$ TL and had reached the juvenile stage. First ovulation was about 9 weeks after hatching and at $22.58{\pm}2.73mm$ TL.
Keywords
Egg development; marine medaka; morphological; Oryzias dancena;
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