Reproductive Cycle of the Venus Fish, Aphycypris chinensis

왜몰개, Aphyocypris chinensis의 생식주기

  • Lee, Sung-Kyu (Toxicology Research Center, Korea Institute of Chemical Technology) ;
  • Choi, Shin-Sok (Department of Biology, College of Natural Science, Chungnam National University) ;
  • Yeom, Dong-Hyuk (Toxicology Research Center, Korea Institute of Chemical Technology)
  • 이성규 (한국화학연구소 안전성연구센터) ;
  • 최신석 (충남대학교 자연과학대학 생물학과) ;
  • 염동혁 (한국화학연구소 안전성연구센터)
  • Published : 2000.12.30

Abstract

The gonadosomatic index (GSI), hepatosomatic Index (HSI), egg size distribution, gonad development and reproductive characteristics of venus fish, Aphyocypris chinensis, were examined during March 1997- March 1998 in agricultural waterways of the Sedo-myun, Puyo county, Chungnam Province, Korea. Annual reproductive cycle was classified into the following five successive phases by monthly changes in GSI and the characteristics of ovary: quiescent phase (January- February), secondary growing and mature phase (March-May), ripe and spawning phase (June-July), degenerating and resting phase (August-September) and primary growing phase (October-December). The hepatosomatic index (HSI) showed clear seasonal pattern with two separate peaks. However, it exhibited a negative correlation to changes of GSI values. The regression analysis suggested that fecundity showed a strong positive linear relationship ($r^2\;=\;0.91$, n = 34) with body weight. The sex ratio of female to male was 1.4 : 1 in the natural population during the study. The minimum reproductive size of female and male venus fish was 38 mm and 33 mm in fork length, respectively.

1997년 3월부터 1998년 3월까지 충청남도 부여군 세도면 모세올 지역의 농수로에서 채집한 왜몰개, Aphyocypris chinensis를 대상으로 생식생태를 조사하기 위하여 연간 생식소숙도지수(GSI), 간숙도지수(HSI), 난경조성과 생식소 발달과정 및 다른 번식특성들을 조사하였다. GSI 변화, 생식소의 발달과정 및 난경조성에 대한 분석결과, 1${\sim}$2월은 정체기, 3${\sim}$5월은 2차 성장기 및 성숙기, 6월에서 7월 사이는 완숙 및 산란기, 8${\sim}$9월은 퇴화 및 휴지기, 10${\sim}$12월은 1차 성장기로 나타낼 수 있었다. HSI는 연간 2개의 피크를 나타냈으며 GSI의 변화와는 역상관 관계를 보였다. 조사지점에서의 왜몰개 암컷의 포란수는 체중과 1차 함수적으로 증가하였으며 (r$^{2}$ =0.91, n = 347), 성비는 1.4 : 1 (암컷 : 수컷) 이었다. 생식가능한 최소 체장(fork length) 범위는 암컷에서는 38 mm, 수컷에서는 33mm로 조사되었다.

Keywords

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