소라 Turbo cornutus SOLANDER 의 증식에 관한 연구 -Ⅰ : 소라의 산란과 초기발생 Spawning and early development of the top shell , Turbo cornutus SOLANDER = STUDIES ON THE PROPAGATION OF TOP SHELL -Ⅰ

국문 초록 (Abstract)

1972∼1974年 5∼7月에 여수근처산 소라 Turbo cornutus를 材料로 하며 産卵誘發刺載, 受精率, 卵發生 幼生의 成長 生殘率및 發生初期幼生의 적염분 농도등에 대하여 調査하였으며 그 結果를 要約하면 다음과 같다.
1. 산란유발 방법으로 간출자극, 가온자극, 정자액첨가등의 方法을 每日 번갈아 17回 實施한 結果 간출자극에서 2回 加溫자극에서 1回의 방란 방정이 일어났고 이때의 수정율은 83.8∼96.4%였다.
2. 수정난의 난경은 0.182±0.0028㎜였고 난막경은 0.245±0.0093㎜였다.
3. 초기유생의 발생과정은 水溫 20.6∼25.4℃ 범위에서 11.05∼11.15 시간후에 부화하였고 3.0∼3.5日後에 附着이 始作되어 5日後에 完了되었다.
4. 부착된 幼生의 성장은 부화 10日後 殼徑0.31㎜, 59日後 1.15㎜, 72日後 1.97㎜, 90日後에는 2.66∼3.15㎜, 150日後에는 각고 5.24∼6.49㎜로 各各 成長 하였다.
5. 부착치패의 부화후 150日間의 飼育에서 經過日數(D)에 따른 殼徑(S) 및 殼口經(A)의 成長開係式은
1972年 S=0.33e^(0.02070)D
A=0.19e^(0.02073)D
1973年 S=0.32e^(0.02282)D
A=0.16e^(0.02596)D의 지수곡선식으로 各各 表示되었다.
6. 부화후 150日까지의 각경(S)과 각구경(A)과의 상대성 장식은
1972年 A=0.6478S-0.1575
1973年 A=0.5897S-0.0515의 회귀직선식으로 表示되었다.
7. veliger 幼生의 부화11日後의 着生率은 0.020∼0.181% 였으며 附着以後 150日 동안의 생잔율은 7.4∼21.6%였다.
8. 수온 21.0∼23.7℃에서 알과 浮遊幼生의 發生 및 生殘에 適當한 鹽分濃度의 범위는 30∼35‰였다.

다국어 초록 (Multilingual Abstract)

Fertilization and early development of turbo cornutus was studied based on the samples which were collected in Yeosu area.
Particular emphasis was paid on induction of artificial spawing, fertilization rate, preembryonic development, the growth of the early larva and larval survival to various salinity.
Among the various methods for induction of artificial spawning which have been tested for the present study, drying by exposure to air is the most efficient, and percentage fertilization rate was 83.8-96.4, The diameter of fertilized eggs was 0.182±0.0028㎜; and the diameter of egg membrane was 0.245±0.0093㎜. Under the temperature range of 20.6-25.4℃ the larvae hatched out after 11:05-11:15 hours of fertilization. After 3.0-3.5 days of fertilization the planktonic larvae begand to settle, and the settlement terminated within 5 days.
During the period of 150 days of early culturing the diameter growth of shell(M) and the diameter of shell aperture(A) was formulated as follows:
1972 M=0.33e^(0.02070D)
A=0.19e^(0.02282D)
1973 M=0.32e^(0.02282D)
A=0.16e^(0.02596D)
During the same period of early culturing the relative growth of shell diameter and the diameter of shell aperture was formulated as follows:
1972 A=0.6478 S-0.1575
1973 A=0.5897 S-0.0515
After 11 days of larval hatching 0.02-0.18% of planktonic larvae settled. After 150 days of settlement the survival rate of the early shells was 7.4-21.6%, Under the temperature range of 21.0-22.7℃ the optimum salinity range for the development of egg and the planktonic larvae was 30-35‰.