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ISSN : 1225-3480
일본재첩의 자원관리를 위한 기초조사로 배우자 형성과정 및 생식주기, 군성숙도, 발생과정 등을 조사한 결과, 자웅이체 난생 종으로 암컷의 생식소는 회흑색, 수컷의 생식소는 유백색을 띄어 육안적으로 뚜렷히 구별되었다. 배우자의 형성과 성장은 수온에 지배되는 것으로 나타났으며, 성숙한 난모세포는 원형으로 그 크기는 약 80<TEX>$\mu\textrm{m}$</TEX> 전후였다. 생식주기는 초기활성기 (2-4월), 후기활성기 (5-7월), 완숙기 (6-9월), 부분산란기 (7-9월), 퇴화 (9-10월) 및 비활성기 (10-익년 5월)의 연속적인 5 단계로 구분할 수 있었으며, 방란.방정후 생식소 자체가 완전히 퇴화되지 않고 새로운 조직에서 신생되면서 비활성기를 지나 이듬해 봄에 다시 분화가 활발히 개시되었다 따라서 일본재첩의 번식생태는 긴 생식소의 발달기간에 비해 짧은 방란.방정기를 가지는 종으로 특징 지워진다. 자원의 증식과 관리를 위한 자료로 매우 중요한 군성숙도를 조사한 결과 암컷과 수컷의 50% 개체가 각각 생식에 참가하는 각장은 약 10-12 mm로 추정되었고, 각장 16 mm 이상이면 전 개체가 생식에 참가하는 것으로 나타났으며, 생식에 참가하는 최소각장에 있어 암.수 개체간 차이는 볼 수 없었다. 방출된 알은 분리침성란으로 수정란의 난경은 약 80-90 <TEX>$\mu\textrm{m}$</TEX> 범위에 있었으며, 수온 26.5-28.<TEX>$0^{\circ}C$</TEX>에서 수정 후 약40분이 지나면서 극체 (polar body) 가 방출되었다. 수정 14시간 후에는 낭배기, 27시간 후에는 담륜자기로 발생하였다. 이어 수정후 4일경부터 유각이 형성되고 폐각근, 장관, 면반 등이 분화된 D형 자패가 출현하였다. 개체간 성장 차이는 있었지만 57일간의 사육일수에 대한 각장과 각고의 상대성장식을 구한 결과, 사육일수 (X) 에 대하여 각장 (Y) 의 성장은 Y = 14.4X + 209.58 (<TEX>$r^2$</TEX>= 0.9078), 각고 (Y) 는 Y = 11.5l7X + 167.48 (<TEX>$r^2$</TEX>= 0.8744)로 나타났다.
Gametogenes, reproductive cycle, first sexual maturity(biological minimum size), sex ratio and larval development of the marsh clam Corbicula japonica were investigated monthly by histological observations. Samples were collected in brackish water of Gokgang stream, Kyungsangbuk-Do, Korea, from August 1997 to July 1998. Sexuality of Corbicula japonica is dioecious and the species are an oviparous clam. The gonads are irregularly arranged from the sub-region of mid-intestinal gland in visceral cavity to reticular connective tissue of foot. The ovary is composed of a number of ovarian sac which are branched arborescent. Oogonia actively proliferate along the germinal epithelium of ovarian sac, in which young oocytes are growing. The testis is composed of a number of testicular tubules, and the epithelium of the tubule has function of germinal epithelium, along which spermatogonia actively proliferate. A great number of undifferentiated mesenchymal tissue and eosinophilic granular cells are abundantly distributed between developing oocytes and spermatocytes in the early developmental stages. With the further development of the ovary and testis these tissue and cells gradually disappear. Then the undifferentiated mesenchymal tissue and eosinophilic granular cells are considered to be related to the growing of the oocytes and spermatocytes. The spawning period is from July to September, and the main spawning occur between July and August when seawater temperatures reach above 22<TEX>$^{\circ}C$</TEX>. The reproductive cycle of this species can be divided into five successive stages; early active (February to April), late active (May to July), ripe (June to September), partially spawned (July to September), degenerative (September to October) and resting stage (October to February). Percentages of first sexual maturity of female and male clams ranging in length from 10 mm to 12 mm are over 50% and 100% for clams over 16.0 mm in shell length. Fertilized eggs or Corbicula japonica were 80-90 <TEX>${\mu}{\textrm}{m}$</TEX> in diameter. In the early embryonic development of C. japonica, the appearance of polar body, trochophore and D-shaped veliger were observed around 40 min., 27 hours and 4 days after spawning, respectively, at a water temperature of 26.5-28.<TEX>$0^{\circ}C$</TEX>. The size of larvae of early umbo stage was about 185-210 <TEX>${\mu}{\textrm}{m}$</TEX> in shell length, 160-180 <TEX>${\mu}{\textrm}{m}$</TEX> in shell height around 7 days after fertilization. The correlation of relative growth between the culture day (D) and shell length (SL) was expressed by the following simple formula from D-shaped veliger to metamorphosing stage; SL = 13.300D + 209.36(<TEX>$r^2$</TEX>= 0.9078).
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