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１９９６年 ８月、 １１月各一次调查人溪河的底栖动物。共采集到底栖动物 ３９种，其数量为８７．３ｉｎｄ／ｍ２，生物量为０．９５０４ｍｇ／ｍ２。优势种类为方巢石蚕、四节蜉、小蜉、光石蝇和溪大蚊五种。火溪河底栖动物具有明显的山地型、流水型特点，时空分布一致。应用ＢＭＷＰ记分系统、ＢＢＩ／ＦＢＩ生物指数和Ｓｈａｎｎｏｎ多样性指数对火溪河水质进行评价，表明水质清洁。作者建议以方巢石蚕 ７０．０ｉｎｄ．／ｍ２作为火溪河水质清洁与轻污的一个界定值。
In August and November 1996, each survey of zoobenthos in Renxi River was conducted. A total of 39 species of zoobenthos were collected, the number of which was 87.3 ind / m2 and the biomass was 0.9504 mg / m2. The dominant species are Fang nest stone silkworm, four knot, small knot, light stonefly and river mosquito five. Fire brook benthic animals have obvious mountainous, water-type features, the same space-time distribution. The evaluation of the water quality of the Huoxi River using the BMW P score system, BBI / FBI bioinformatics and Shannon’s diversity index showed that the water quality was clean. The authors suggest Fang Fang Shi silkworm 70.0ind. / M2 as a definition of the clean water and light pollution of the Huoxi River.