作　　者： ; ; ; ; ; ; ;

机构地区： 中国水产科学研究院珠江水产研究所

出　　处： 《淡水渔业》 2007年第4期37-40,共4页

摘　　要： 2006年5～7月对西江肇庆江段鱼苗的时空分布进行了研究,结果表明:5月17日及6月1日前后该江段有苗汛发生,鱼苗密度平均值为0.83尾/m3,最大值为7.9尾/m3;鱼苗密度昼夜分布有显著性差异(n=26,P<0.01),夜间的密度比白天的高;鱼苗的种类在昼夜分布上也有明显差异,四大家鱼鱼苗的分布主要集中于夜间;鱼苗的分布具空间差异性,近岸的鱼苗密度高于江中央的。 Based on the survey of fish fry in Xijiang River from May to July in 2006, Spatial and temporal distribution of fish fry was studied. The results showed that： in 17 May and 1 June the density of fish fry reached the highest level, with the average density of 0. 83 ind./m^3 , max density 7.9 ind./m^3 ; variation of fry abundance between night and day at surface was very conspicuous （n = 26, P 〈 0.01 ） , the density in night was higher than the density in day; variation of abundance was also obvious for different species fry, four famous freshwater fishes （ grass carp, black carp, silver carp and big head） were mainly sampled at night; variation of spatial distribution was observed, and the density of fish fry near shore was higher than the density in mid-river.

关 键 词： 西江 鱼类早期资源 时空分布

领　　域： [农业科学] [农业科学]