菊花心江蓠在网箱养殖区的生物修复作用

2003年8～12月，利用菊花心江蓠(Gracilaria lichenoides)在福建省东山县八尺门网箱养殖区进行生物修复实验。通过定点跟踪监测，定点连续监测，断面监测和平面监测，结果表明，江蓠对受污染的海水具有较好的修复效果。菊花心江蓠能有效提高水中的DO浓度，使修复实验区的DO浓度明显高于非养殖区和网箱养殖区的DO浓度；菊花心江蓠还能降低水中的IN、IP浓度，特别是3种价态的IN中，菊花心江蓠优先吸收铵氮，这对减轻网箱养殖区自身污染的影响更具实际意义。

Bioremediation of Gracilaria lichenoides in fish cage-farming areas

Water self-pollution and eutrophication have becoming the most important environmental problem in mariculture as its fast development.Using macroalgae to remove nutrition elements such as N and P,and produce O_2 is one of the most effective ways to prevent the pollution, enhance dissolved oxygen concentration, and avoid eutrophication.Bioremediation of polluted mariculture water has become the focusing point for the researchers all over the world.Gracilariae is a group of macroalgae, can improved the water quality and can be used as the raw material for agar production and the feed for abalone.Dongshan County of Fujian Province is an important base of abalone culture and cage culture in the nation.After about twenty years of mariculture, some sea areas such as Bachimen fish cage-farming in Dongshan County have been seriously polluted.The technique utilizing Gracilaria to remediate the mariculture water environment has been studied.Gracilaria lichenoides,which was introduced from Taiwan province in 1998,was applied as a remediator to rescue the pollution environment in the area of Bachimen fish cage-farming.The experiments were conducted in Dongshan island from August to December 2003.Water quality was monitored at fixed sites or sections or planes of different functional areas including bioremediation fish cage-farming and non-aquaculture during the experimental courses.The results showed that after the data collected from the areas of fish cage-farming and non-aquaculture were compared,G.lichenoides was effective in terms of uptakes of inorganic nitrogen and inorganic phosphorus,and improvement of the dissolved oxygen in the area of bioremediation on sunshine.In rainy weather,the effect of bioremediation was still obvious.While in the area of fish cage-farming, concentrations of inorganic nitrogen and inorganic phosphorus were higher and the concentrations of DO were apparently lower than that in the area of non-aquaculture.Especially,it was important to alleviate the self-pollution of fish cage-farming and G.lichenoides was prior to uptake ammonia of inorganic nitrogen.So it could avoid causing fish to death in the foul weather.Furthermore,the outputs of the bioremediatior G.lichenoides could be used as foods for abalones and thus enhance the total economic value of mariculture.This study also demonstrated an ecological approach for sustainable aquaculture.