单环刺螠对刺参养殖池塘底质的影响

Effect of Urechis unicinctus on Pond Sediment for Stichopus japonicus aquculture

对刺参单养池、刺参与单环刺螠混养池等养殖池中底泥硫化物、总碳(TC)、总氮(TN)、总磷(TP)、化学需氧量(COD)等指标进行检测对比,结果发现,单环刺螠与刺参混养模式下,底泥中硫化物、TC、TN、TP、COD的含量显著低于刺参单养池,表明单环刺螠对养殖池中底泥相关指标尤其硫化物具有改良效果.通过刺参单养池中硫化物与其他指标的相关性研究发现:硫化物与TC呈显著性正相关,r(相关系数)为0.933 0;与COD呈非显著性正相关,r为0.815 4;与TP呈非显著性正相关,r为0.727 7;与TN呈非显著性负相关,r为-0.161 0.经综合分析,该研究认为:单环刺螠在养殖池底泥指标的改良方面具有积极意义,可为刺参养殖池的生物修复提供理论依据.

Monoculture pond for Stichopus japonicus and polyeulture pond for S. japonicus and Urechis unicinctus are compared based on five environmental indexes of bottom sediments, including sulfide content, total carbon （TC） , total nitrogen （TN）, total phosphorus （TP）, and chemical oxygen demand（COD）. The results show that the inde- xes of TC, TN, TP and COD for po]yeulture pond are significantly lower than those for S. japonicus monoculture pond. This implies that U. unicinctus may have positive effect on the improvement of sediment. Furthermore, the correlation between sulfide content and other indicators of bottom sediments for S. japonicus monocuhure pond is analyzed. The results showe that sulfide content is significantly and positively correlated to TC, insignificantly and positively to COD and TP, with correlation coefficients of 0. 933 0, 0. 815 4, and 0. 727 7, respectively. Sulfide content is insignificantly and negatively correlated to TN, with correlation coefficient of -0. 161 0. Comprehensive analysis indicat that U. unicinctus may have beneficial effects on the improvement of sediment. Result of this work could provide theoretical basis for the bioremediation of S. japonicus culture system.