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ISSN : 1225-3480
인위적인 가온만으로도 새꼬막의 성숙 및 정상적인 난 발생이 이루어지는지 알아보기 위해 생존율, 성비, 비만도, 생식소발달빈도, 생식소지수, 수정률, 부화율 및 D형 유생까지의 발생소요시간을 조사하였다. 생존율은 대조구에 비해 가온구에서 낮았으며, 성비는 암컷의 비율이 높았다. 비만도는 대조구와 가온구가 유의한 차이를 보이는 가운데 수온 17℃ 이상부터 증가폭이 높게 나타났다. 생식소발달빈도는 암․수 모두 대조구의 경우 발달이 느렸으며, 가온구는 수온 20℃인 사육 21일부터 28일 사이에 성숙기에 도달한 개체들이 80%이상 관찰되었다. 생식소지수는 대조구에 비해 수온이 높을수록 증가하는 경향을 보였다. 새꼬막의 수정률은 82.17 ± 3.55% 였으며, 부화율은 63.57 ± 2.36%로 나타났다. D형 유생의 발생소요시간은 약 15시간으로 나타났다.
The investigated of survival rate, sex ratio, condition index, gonad development frequency, gonad index, fertilization rate, hatching rate and time required development of D shape larvae of the ark shell, Scapharca subcrenata. Survival rate was lower in heating group compared with control group(P < 0.05). Sex ratio(female:male) observed 1:0.97 in control group, 1:0.62 in heating group. Condition index was significantly higher in heating group than control group(P < 0.05) and higher increased more than water temperature 17℃ of heating group. Gonad development observed slow in control group but more than ripe stage 80% in heating group(21-28 day, 20℃). Gonad index was higher in heating group compared with control group(P < 0.05). Fertilization rate and hatching rate of the ark shell was observed 82.17 ± 3.55% and 63.57 ± 2.36%, respectively. The time required development of D shape larvae of the ark shell was observed 15 hour after fertilization. The suggested that results of the ark shell by heating were effective sex maturation and normal egg development.
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