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KMID : 0894520090130040281
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Development & Reproduction
2009 Volume.13 No. 4 p.281 ~ p.289
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Embryonic and Larva Development of Slime Flounder, Microstomus achne
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Byun Soon-Gyu
Lee Sung-Hun
Hwang Jae-Ho
Han Kyeong-Ho
Kang Kyeong-Wan
Kim Jin-Do
Kim Yi-Cheong
Lee Bae-Ik
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Abstract
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The slime flounder Microstomus achne were caught at Geomun Island, Yosu-si, Jeollanamdo from January to March in 2006. The fertilized eggs were observed for morphological development of egg, embryo and larva. Eggs were colorless transparent, separative pelagic, absent of oil globule, and the diameter was 1.64±0.03 ㎜ (n=50). The eggs were hatched at 168 hours 40 minutes after fertilization in the range of 9.8~13.0℃ (mean 11.4±1.6 ℃). Total length of newly hatched larva was 4.05±0.18 ㎜ (n=20). The larva had developed membranous fin showing waterdrop-shaped structure, and their mouth and anus were not open. The myotomes were 14~15＋33~34=47 ~49. The egg yolks were 1.64±0.12 ㎜ in major axis, and 1.23±0.19 ㎜ in minor axis. At 12 days after hatching, the total length was 7.32±0.42 ㎜ (n=20). The egg yolk was completely absorbed and transferred to post larval stage. Star-shaped melanophores and branch-shaped xanthophores in the edge of membranous fin were more densed. Chrysanthemum-shaped melanophores in the notochord were densed and formed 4~5 melanophore bands. At 90~93 days after hatching, morphological features of the larva, 19.91±1.63 ㎜ TL (n=20), were transferred to juvenile stage showing similar features with those of the adult fish.
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KEYWORD
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Microstomus achne, Egg development, Larvae and juveniles
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