几种培养方法对萼花臂尾轮虫(Brachionus calyciflorus)种群密度及其环境因子影响的比较研究

分别利用泥鳅 -藻 -轮虫和罗非鱼 -藻 -轮虫共生隔离培养的方法 ,研究萼花臂尾轮虫 ( Brachionuscalyciflorus)的种群密度和主要环境因子的变化。研究结果表明 :加入泥鳅的培养缸中 ,有 1 1 d轮虫数量超过 1 0 0 ind/ml,其中有 5d超过 2 0 0ind/ml,最高密度达 2 50 ind/ml;在罗非鱼的培养缸中 ,在整个实验过程中 ,种群密度超过 1 0 0 ind/ml以上的时间有 6d(第5～ 1 0天 ) ;单纯利用藻类培养轮虫时 ,种群密度较低 ,且维持时间较短 ,最高种群密度不足 1 0 0 ind/ml,利用藻类 -轮虫 -鱼类共存同一生态系统中 ,并使鱼类和轮虫隔离进行生态培养时 ,能提高轮虫种群密度 ,延长种群高峰期

The effects of different methods of cultivation on the densities of Brachionus calyciflorus(rotifer)and its environmental conditions

The density of rotifer Brachionus calyciflorus and the changes of environmental conditions were studied in aquarium,in which both rotifer and fish( Tilapia nilotica and Misgurnus anguillicaudatu) separated from each other were grown in medium of algae in outdoor.Results show that density of rotifer cultured with Misgurnus anguillicaudatus excesses 100 individual per ml in 11 days.There are 5 days in which rotifer densities attain 200 ind./ ml and the highest density attain 250 individual per ml.The time in which rotifer densities excesses 100 individual per ml is 6 days in aquarium cultured with Tilapia nilotica. In contrast,the density of rotifer is lower than that cultured with fish,and lasting time is shorter than that in aquarium with fish.The highest density of rotifer is under 100 ind./ml.The authors suggest that the lasting time of higher density of rotifer could be prolonged when it cultured with fishes.