빙어의 난발생과정과 자어의 형태발달 = Eggs Development and Larval Development of the Ice Fish , Hypomesus transpacificus nipponensis McAllister

국문 초록 (Abstract)

1990年 3月, 慶尙北道 盈德郡 江口面에 位置한 五十川과 慶尙南道 密陽市 密陽江에서 채집하여 人工受精한 卵을 실험실로 운반하여 卵發生過程과 孵化仔魚의 成長에 따른 形態變化를 觀察한 결과는 다음과 같다.
1. 빙어의 受精卵은 球形의 沈性附着卵으로 무색 투명하며, 卵徑은 0.85∼1.05㎜(평균 0.97㎜, n=50)이다.
2. 孵化에 소요된 시간은 평균 16.5℃에서 약 170시간만에 孵化한다.
3. 孵化直後의 仔魚는 全長 3.85∼4.25㎜(평균 4.05㎜, n=10)로, 아직 입과 항문이 열려 있지 않고, 눈에 色素胞가 착색되어 있으며, 근절수는 52∼54개이다.
4. 孵化 4∼5日째의 仔魚는 全長이 5.20∼5.65㎜(평균 5.37㎜, n=10)로 卵黃은 거의 흡수되고, 눈의 色素는 더욱 짙어진다.
5. 孵化 20日째의 後期仔魚는 全長이 8.20∼8.55㎜(평균 8.38㎜, n=10)로 脊索末端이 45˚각도로 위로 굽어진다.
6. 孵化 25日째의 後期仔魚는 全長이 9.15∼9.75㎜ (평균 9.63㎜, n=10)로 등지느러미와 뒷지느러미에 각각 융기하기 시작하여 原基가 나타난다.

다국어 초록 (Multilingual Abstract)

Artificial fertilization of ice fish, Hypomesus transpaciticus nipponensis caught at Milyang-river and Osib-chun brook was performed in March 24, 1990, and the hatched larvae were reared for 25 days to describe the development of eggs and larvae. Fertilized eggs were spherical in shape, measuring 0.85∼1.05 ㎜ in diameter (mean: 0.97 ㎜) and translucent adhesive with many small-sized oil globules on the surface. Hatching in the indoor tank started from the 170 hours after fertilization under 16.5℃ water temperature. Newly-hatched larvae were measured 3.85∼4.25 ㎜ in total length (mean: 4.05 ㎜), and mouth and anus were not yet open. They had one yolk sac on the anterior part of abdomen, straight-type's notochord, and 52∼54 myotomes. The larva of 5 days old transformed to postlarval stage and measured 5.20∼5.65 ㎜ (mean: 5.37 ㎜) in total length. As the yolk sac was completely absorbed, mouth and anus were open, and they fed rotifers vigorously. In 20 days after hatching, the larvae grew to 8.38 ㎜ in TL, and the caudal notochord flex at 45℃. In 25 days after hatching, total length reached 9.63 ㎜. The part of the fin-fold of the future dorsal and anal fins became high.