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分别于2009年8月和2010年5月对直湖港支流龙延河水系的鱼类集群现状及其影响因素进行研究.结果表明,研究区域有多种鱼类存在,共采集到31种,隶属于5目9科22属;春、夏两季鱼类集群的种类数没有明显差异,但春季的鱼类多度和生物量均显著高于夏季;主干支流、次级支流和支流末端等不同区位的鱼类组成也有一定差异;水体透明度、溶解氧与鲫、圆尾斗鱼、叉尾斗鱼多度显著正相关,而氮、磷等营养盐浓度与似鳊、餐条、鲫鱼等种类的多度呈负相关;水体营养盐浓度过高及相应的溶解氧、透明度降低均对鱼类群落产生了不利影响.
The status quo and influencing factors of fish cluster in Longyan River, a tributary of Straight Lake, were studied in August 2009 and May 2010, respectively. The results showed that there were 31 species of fish in the study area, Belonging to 5 orders, 9 families and 22 genera. There was no significant difference in the number of fish assemblages in spring and summer, but the fish abundance and biomass in spring were significantly higher than those in summer. The main tributaries, secondary tributaries and tributary ends There were also some differences in the composition of fish in different regions; the transparency of water bodies, dissolved oxygen and crucian carp, round-tailed betata, fork-tailed fish were significantly and positively correlated, while the nitrogen and phosphorus nutrient concentrations were similar Species abundance was negatively correlated; high concentrations of nutrients in the water body and the corresponding decrease in dissolved oxygen and transparency had an adverse impact on fish communities.