제주연안에 서식하는 오분자기, Haliotis diversicolor aquatilis의 생식주기
Reproductive Cycle of Small Abalone, Haliotis diversicolor aquatilis in Jeju Coastal Waters
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제주도 성산 연안 지역에 서식하는 오분자기의 생식주기를 조사하기 위하여 2006년 5월부터 2007년 4월까지채집된 개체를 대상으로 생식소지수와 생식세포 발달단계, 황색 과립세포 출현양상과 생식상피의 형태변화를 조사하였다. 생식소지수(GI)의 월별 변화는 암컷과 수컷 개체 모두 유사한 경향을 보였다. 암컷 GI는 2006년 5월 21.63±2.42에서6～8월 55.38±11.73으로 최대값을 보였고, 9월 27.75±4.76으로 감소하였다가 10월 51.36±7.47 증가한 후 2007년 4월까지낮은 값(7.65±0.85)을 유지하였다. 오분자기의 생식주기는 생식세포 발달 단계에 따라 연속적인 6단계로 구분하였다. 암컷은 분열증식기(2월과 5월), 성장기(2월～5월), 성숙기(4월～7월), 부분산란기(5월～11월), 퇴행기(10월～12월) 그리고 회복기(9월～10월, 12월～2월) 등으로 구분할 수 있었다. 수컷은 분열증식기(2월과 5월), 성장기(3월～5월), 성숙기(4월～7월),방정기(6월～11월), 퇴행기(11월～2월) 그리고 회복기(9월～2월) 등으로 구분할 수 있었다. 생식소내 황색과립세포는 성숙및 산란기보다 분열증식기, 성장기, 퇴행기, 회복기에 많이 관찰되었다. 오분자기 GI 및 생식소의 조직상 관찰 결과, 암컷은 5월부터, 수컷은 6월부터 일부 개체가 부분산란 및 방정을 시작하여 8～9월에 1차 산란을 한 후 10～11월에 2차 산란에 가입하는 경향을 보여 일 년에 2회 이상의 산란시기를 갖는 다회 산란특성을 보였다
Abstract
Reproductive cycle of the small abalone, Haliotis diversicolor aquatilis which collected from Seong-san coastal waters, Jeju, Korea were investigated monthly from May 2006 to April 2007 using histological methods. The gonad index (GI) of male and female reached a peak in June (70.72±5.20) and July (55.38±11.73). Subsequently, GI decreased in September (Male, 21.27±2.91; Female, 27.75±4.76) and increased again in October (Male, 48.49±8.39; Female,51.36±7.47), respectively. After that, GI gradually decreased. In March 2007, GI was reached the minimum (Male,8.46±0.57; Female, 9.69±0.88). The reproductive cycle of female and male could be divided into six successive stages ;In female, multiplication (February and May), growing (February to May), mature (April to July), partial spawning (May to November), degenerating (October to December) and recovery (September to October and December to February) stage. In male, multiplication (February and May), growing (March to May), mature (April to July), spawning (June to November),degenerating (November to February) and recovery (September to February) stage. The yellowish granular cells have been observed more in multiplication, growing, degenerating, and recovery stage than mature and partial spawning stage. The results of GI and histological observations of the gonads suggested that this species could be presumed as multi- spawning characteristics more two times in spawning seasons
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