CAJ | 학술논문

2011年4月中旬至5月下旬，在长白山头道白河上游捕捞北方条鳅样本846尾，对其种群结构进行了，分析，结果表明：捕捞群体的体长为2．2—14．6em，平均8．8cm，以10-12cm体长组和2-4cm体长组的数量最多，两者所占的比例合计达75．3％，呈明显的双峰型分布格局．雌性和雄性群体的体长组成相似；捕捞群体的总体性比接近1：1，但不同体长组的性比不同，个体小者（体长小于8cm）雌性所占比例较低，个体大者（体长大于13cm）雌性所占比例则明显偏高；春季迁移过程一般是大个体在先，小个体在后．
2011년4월중순지5월하순，재장백산두도백하상유포로북방조추양본846미，대기충군결구진행료，분석，결과표명：포로군체적체장위2．2—14．6em，평균8．8cm，이10-12cm체장조화2-4cm체장조적수량최다，량자소점적비례합계체75．3％，정명현적쌍봉형분포격국．자성화웅성군체적체장조성상사；포로군체적총체성비접근1：1，단불동체장조적성비불동，개체소자（체장소우8cm）자성소점비례교저，개체대자（체장대우13cm）자성소점비례칙명현편고；춘계천이과정일반시대개체재선，소개체재후．
846 samples of Nemacheilus nudus was caught in the upper reaches of Toudaobaihe River in Changbai Mountain from mid April to late May,2011 ,and the population structure was analyzed. The results showed that the body length of population is from 2.2 cm to 14.6 cm with an average of 8.8 cm, and most in 10 - 12 cm length group and 2 - 4 cm length group,which account for 75.3% of the whole population totally, assuming obviously a bimodal distribution pattern. The body length composition of the female is similar to that of the male ones. The sex ratio is close to 1 ： 1 in the overall caught population, but it is different in different body length groups. The female proportion is lower in the smaller groups （ body length less than 8 cm） while it is obviously high in that of the larger ones（ body length more than 13cm） the Generally the larger individuals migrate first while smaller ones later in the spring migration process.