附着基对分叉小猛水蚤(Tisbe furcata)种群密度及水体化学要素的影响

Effects of attached substance on population density of Tisbe furcata and water chemical elements during the mass culture

以分叉小猛水蚤(Tisbe furcata)为研究对象,对比室内养殖条件下添加附着基与否对分叉小猛水蚤的种群密度的影响,并同步分析水体化学要素(亚硝态氮、硝态氮、氨氮和磷酸盐)与桡足类种群密度的关系。研究结果表明,加入附着基并未达到增加桡足类种群密度的效果,反而有一定的抑制作用。对水体三氮一磷的分析表明亚硝态氮、硝态氮和磷酸盐含量均与桡足类种群密度呈极显著正相关,而氨氮浓度与桡足类种群密度间没有相关性,这与之前研究结果一致,进一步验证了现有养殖方法的可靠性。此外,添加附着基养殖池中快速升高的亚硝氮含量可能抵消了附着基的积极作用,因此,后续相关研究需要综合考量上述因素。

Tisbe furcata was cultured in indoor cement ponds in research base of Ludong University. The population density was compared under both adding and non-adding attached substances conditions. Then the relationships between population density and water chemical elements, nitrite, nitrate, ammonia nitrogen and phosphate were analyzed. The results showed that adding adhering substances could not increase the population density of T. furcata. The population density of T. furcata in substances-adding ponds was lower than that in ponds without adding substances. The concentrations of the nitrite, nitrate and phosphate were positively correlated with the copepods population density except for the concentration of the ammonia nitrogen. It is consistent with our previous results, which can verify the validity of the current mass culturing method. Moreover, the concentration of the ammonia nitrogen increases rapidly in substances-adding ponds, and it may decrease the positive effects of adding substances in the ponds. Therefore, further study might be needed.