ISSN : 1225-3480
이 연구는 1999년 11월부터 2000년 9월까지 Micronesia Chuuk Island 연안에서 채집한 Trochus niloticus의 생식세포형성과정, gonad bulk index (GBI), 월별 난모세포 크기 변화 생식주기 그리고 산란리듬 탐색을 조직학적인 방법으로 조사하였다. T. niloticus는 자웅이체로 성비는 암수 1:1이었다 (p > 0.05). 난소는 난황구기 단계의 난모세포와 정소는 정세포와 정자가 연중 관찰되었다. 월별 GBI는 2월, 3월, 4월 그리고 6월에 다른 달보다 높았다. 주 산란은 4-5월 그리고 6-7월에 일어났지만, 부분 산란하는 개체가 연중 관찰되었다. 월령에 따른 GBI는 다른 월령보다 보름에 높아, 산란은 보름과 하현 사이에 일어나는 것으로 추정된다.
Gametogenesis, changes of gonad bulk index (GBI), monthly variation in oocyte diameter, reproductive cycle and spawning with lunar cycle of the top shell, Trochus niloticus were investigated by histological examination. The specimens were sampled in the coastal waters of Chuuk Island, Micronesia, form November 1999 to September 2000. T. niloticus is a gonochorism, and the female and male were present in an approximately 1:1 ratio (p > 0.05). The ovary contained with the oocyte of yolk stage, the testis composed of the spermatid and spermatozoa at around the year. Monthly GBI were higher at February, March, April and June than the other months. Major spawning occurred between April and May, and June and July but the individuals of partially spawning were presented throughout the year. GBI with lunar cycle were higher at the full moon than the other lunar phase. These results suggest that the spawning occurred between the full moon and last quarter moon.
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