双齿围沙蚕对围塘养殖沉积物氮磷含量的影响

通过在单养鱼系统和鱼藻混养系统中投放不同密度梯度的底栖动物双齿围沙蚕,考察沙蚕对系统养殖环境的修复作用及适宜的沙蚕放养密度。结果显示,加入沙蚕对系统底部沉积物POM(氮、磷污染物)的去除效果显著,相比于单养鱼处理沉积物中氮、磷分别降低了9.59%～10.47%、7.11%～8.18%。此外,沙蚕不同的放养密度对于系统沉积物的修复效果及养殖效益具有显著影响。同样,沙蚕的加入促进了养殖主要经济品种黑鲷品质的提升,鱼体体长、体重以及成活率方面均显著高于单养鱼系统(F),最终产量达到了单养鱼(F)系统的128.33%～156.08%。放养密度为22.5 kg/hm²和30 kg/hm²的沙蚕所产生的环境与资源效益要显著优于放养密度为15 kg/hm²的处理,而在放养密度为22.5 kg/hm²和30 kg/hm²之间差异不大。综合两处理的修复效果及养殖效益,22.5 kg/hm²的放养密度既可有效修复系统的沉积物环境,又能促进养殖效益的提升。

Removing POM of sediment by Perinereis aibuhitensis Grube in earth pond

Rapid development of mariculture supplied the demand of quality protein for human,meanwhile,also resulted in environmental degradation and ecological imbalance.For this reason,lots of maricultureecological models for improving cultured environment were suggested.Among them,seaweeds/ macroalgae were introduced into the system and produced environmental effects.However,macroalgal effect was only restricted in water column,with no effect to improve quality of sediment.This article investigated three-dimensiona...