만경강의 삼천에 서식하는 점줄종개 Cobitis lutheri의 성장과 산란생태에 대해 조사하였다. 연령은 산란기인 7월을 기준으로 1년생은 전장 40~60 mm, 2년생은 전장 60~80 mm, 3년생 이상은 80~110 mm로 추정되었다. 성비(수컷/암컷)는 0.78이었고, 암컷이 수컷보다 20~30 mm가 더 컸다. 이차성정 인 골질반(lamina circularis)은 만 1년이 되면서 생성되었으며, 수컷은 성숙 및 산란기인 4월부터 9월까지 반문의 성적이형을 보였다. 산란성기는 수온이 $24{sim}26^{circ}C$가 되는7월 초부터 중순까지로 추정되었다. 성숙한 암컷의 포란수는 $1,127{pm}453$개, 난경은 $1.09{pm}0.02$ mm였다.
Growth and spawning ecology of Cobitis lutheri (Teleoste: Cobitidae) were investigated in the Samcheon Stream, Mangyeong River, Jeollabuk-do, Korea from 2005 to 2006. Age group of C. lutheri estimated from the total length indicated that the 40 ~ 60 mm group is 1 year old, the 60 ~ 80 mm group is 2 years old, and the 80 ~ 110mm group is 3 ${leq}$ years old. The sex ratio (Male/Female) was 0.78, and the female was 20 ~ 30 mm larger than the male. Lamina circularis at the base of pectoral fins in the males as a secondary sexual character was created 12 months after hatching. A change of lateral coloration of males was observed from April to September. The spawning season was early to middle July with water temperatures of $24{sim}26^{circ}C$. The average number of eggs was $1,127{pm}453$ with the egg diameter of $1.09{pm}0.02$ mm.
