养鳗池塘生态系统中矿物元素及其影响因素

对比分析了6口处于不同养殖阶段的日本鳗鲡(Anguill japonica)池塘水体、水源、底泥及饲料中的矿物元素,探讨了池塘生态系统中矿物元素的主要影响因素和生产管理对策,结果表明:1)养鳗池塘水体矿物元素与所处养殖阶段投入饲料的品种相关,底泥中矿物元素部分在养殖过程中积累而来；2)主成分分析结果表明钙、镁、铝元素是...

The mineral elements in Japanese eel(Anguill japonica) pond ecosystem and the influence factors

The mineral compositions of the pond water,water supply and bottom mud from 6 ponds for eel in different culture stage,as well as the minerals of the feeds were comparatively analyzed to study the main influential factors for the minerals in the pond system and the management measures.The results showed:1) the minerals composition of pond water was associated with the feeds in the culture stage.Parts of the minerals in bottom mud were accumulated in the course of culture.2) Calcium,magnesium and aluminum were the main factors for hierarchical cluster of water body samples and bottom mud samples,moreover,the Ca,Mg and Al contents of three eel feeds(the black eel feed,the elver feed and the adult feed) used in different stages were significantly different,which indirectly demonstrated that the feed type had relatively higher influence on the minerals in pond ecosystem.3) No manganese was detected in all 6 pond water bodies,and no phosphorus was detected in all water supplies,which indicated that phosphorus needed to be replenished in the primary culture stage,and manganese needed to be replenished in the whole culture course to enhance the reproduction and growth of algae.4) The daily management including changing water and disturbing bottom mud can alter the contents of the minerals in the pond ecosystem.Bottom mud disturbing promoted the minerals exchange between mud and water.The content of phosphorus,iron and calcium changed significantly(P<0.05).Therefore,bottom mud disturbing should be an important daily management measure in the healthy culture of eel.