서해안에 서식하는 쏙(Upogebia major, de Hann 1841)과 가시이마쏙(Austinogebia wuhsienweni, Yu 1931) 암컷의 생식 주기
Annual gametogenic cycles of female mud shrimp Upogebia major (de Haan, 1841) and Austinogebia wuhsienweni (Yu, 1931) on the west coast of Korea
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이 연구에서는 우리나라 서해안에 서식하는 쏙 (U. major)과 가시이마쏙 (A. wuhsienweni) 암컷의 연중 번식주기를 조직학적 방법을 이용하여 조사하였다. 채집된 시료는 연령에 따른 성숙 및 번식생태 차이가 있는지 알아보기 위해 두흉갑장 (carapace length, CL)을 기준으로 성체와 어린 개체로 구분하여 분석하였다. 두흉갑장 25 mm 미만의 어린 쏙 (U. major)의 경우에는 생식소 발달단계가 대부분 연중으로 초기발달기 (62~100%)와 후기발달기(10~38%)로 관찰되어 번식에 참여하지 않는 것으로 확인된 반면, 두흉갑장 25 mm 이상의 성체 쏙의 경우에는 뚜렷한 계절적 변화 패턴이 관찰되었다. 성체 쏙의 생식소 발달단계는 11월에서 이듬해 3월까지 초기발달기와 후기발달기가 관찰되고, 완숙기의 성숙난은 4월부터 10월까지 관찰되었다. 두흉갑장 15 mm 이상 가시이마쏙 성체의 경우에는 생식소 내 완숙된 성숙난이 연중 관찰되었으며, 완숙기는 1월부터 6월까지로 관찰되었다. 반면, 두흉갑장 15 mm 이하 어린 가시이마쏙의 경우에는 연중 미성숙 상태를 유지하였다. 우리나라에 서식하는 두 종의 쏙류는 암컷 성체의 생식소 성숙기간이 다른 것으로 조사되었으며, 또한 외포란 시기도 쏙은 월에서 4월, 가시이마쏙은 6월에서 9월로 전혀 다른 성 성숙 주기를 지닌 것으로 확인되었다. 이 연구는 조직학적 방법을 이용한 국내 서식 쏙류의 번식 주기를 최초로 구명한 연구로 쏙류의 생리생태를 이해하는데 중요한 기초자료로 활용될 것으로 기대되며, 패류 양식장 내 쏙류의 구제 방안 도출을 위한 기초자료로 활용될 것으로 기대된다.
Abstract
The annual reproductive cycle of two species, Upogebia major (de Haan 1841) and Austinogebia wuhsienweni (Yu 1931), of the female mud shrimp from the west coast of Korea was investigated using histology. The collected samples were divided into adult and juvenile groups to understand the mature period of age class based on the carapace length (CL). Juvenile Upogebia (CL<25 mm) were mostly inactive gonad with early (62%-100%) and late (10%-38%) development stages during the year, whereas the adult shrimp showed a seasonal pattern of gonad maturation (CL≥25 mm). The early and late developmental stages of oocytes were observed in adult Upogebia from November to March and mature eggs appeared from April to October. In adult Ausitnogebia (CL≥15 mm), fully grown oocytes were consistently observed during the study period, in which the ripe stage was found between January and June. On the other hand, most juvenile Austinogebia (CL<15 mm) maintained an immature state in the gonad. Both species of the mud shrimp reproduced from ovigerous females in the adult population and their egg-bearing period was distinguished from January to April for U. major and from July to September for A. wuhsienweni.
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