盐碱鱼池浮游动物的种类组成及数量变动

2004年6月1日至7月20日对天津市西青区李七庄乡程村的养殖池塘浮游动物的种类组成及数量变动进行了研究。调查结果表明,1#及2#鱼池浮游动物总共有16种。其中原生动物4属5种,平均数量为325．4个／L,占浮游动物总数的9．7％。轮虫6属8种,平均数量为2 831．1个／L,占总数的84．36％。枝角类l属1种,平均数量为175．5个／L,占总数量的5．23％。桡足类1属1种,平均数量为23．7个／L,占总数量的0．70％,另外,萼花臂尾轮虫、长三肢轮虫、角突臂尾轮虫、针簇多肢轮虫、异尾轮虫均为优势种,合计占浮游动物总数的91．8％。

Zooplankton Species and Quantity Changes in Saline-alkaline Ponds

Studies were carried out on species and quantity of zooplankton in fish ponds of Cheng village (Liqizhuang, Xiqing district, Tianjin), from June 1st to July 20th, 2004. The results show that there are 16 species in the fish pond No.1 and No.2. From those, protozoa have 4 genuses, 5 classes and the average quantity is 325.4cells/L, which is 9.7% of total. Rotifers have 7 genuses, 9 classes and the average quantity is 2831.1cells/L, which is 84.36% of total. Cludocera have 1 genus, 1 classes and the average quantity is 171.5celIs/L, 5.23% of total. Copepoda have 1 genus, 1 classes and the average quantity is 23.7cells/L, 0.7% of total. In addition there are several dominant classes, including Filinia longiseta、Trichocerca、Polyarthra trigla、Brachionus angularis and Brachionus calyciflorus, which contained 91.8% of total zooplankton.