찰가자미(Microstomus achne)의 난발생 및 자치어 형태 발달 = Embryonic and Larva Development of Slime Flounder, Microstomus achne

국문 초록 (Abstract)

이 연구는 2006년 1월부터 3월까지 전남 여수시 거문도 해역에서 어획된 찰가자미의 어미로부터 실험실 내 자연 산란을 유도하여 난발생 및 자치어 형태발달을 관찰하였다. 수정란은 무색 투명한 분리부성란이고, 유구는 없었으며, 난경은 1.64±0.03 ㎜(n=50)였다. 부화에 소요되는 시간은 수온 9.8～13.0℃(평균 11.4±1.6℃)에서 수정 후 168시간 40분이었으며, 부화직후의 평균 전장은 4.05±0.18 ㎜(n=20)였다. 부화 직후 자어는 막지느러미가 발달하였고, 물방울 모양 구조를 이루고 있으며, 입과 항문은 열려 있지 않았다. 이때 근절은 14～15＋33～34=47～49개였으며, 난황은 장경이 평균 1.64± 0.12 ㎜, 단경은 평균 1.23±0.19 ㎜였다. 부화 후 12일째 자어의 전장은 평균 7.32±0.42 ㎜(n=20)로 난황은 완전히 흡수되어 후기 자어기로 이행하였고, 막지느러미 가장자리에는 별 모양 흑색소포와 나뭇가지 모양의 황색소포가 더욱 밀집되었고, 척색은 국화 모양의 흑색소포가 밀집되어 4～5개의 흑색소포대를 형성하였다. 부화 후 90～93일째 평균전장이 19.91± 1.63 ㎜(n=20)였고, 모든 지느러미 줄기 수가 정수에 달하였으며, 모든 반문이 형성되어 치어기로 이행하였다.

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