We compared the population size after spawning this year with the size before reproduction season of last year to deduce the degree of population fluctuation . the scope of investigation is almost the same with that of last year except that the middle and upper segments of skyline creek were excluded 本年度的调查范围和去年度所做的普查范围大致相同，但司界兰溪中、上游溪段在去年度调查结果显示已无鱼群分布踪迹，同时因为本年河川流量过大，故于本年度并未调查。
