Microbiochemical Studies on the Oxygen Deficient Layer in Inland Fish-farm Water Regions

内陆湾养殖业最不利的环境条件之一可能是夏季底层水中形成缺氧层，为了解决这一问题，本文旨在阐明内陆湾养殖场底泥有机污染的机理，并与通常的富营养化水域进行比较。从两种有机污染水域底泥中植物色素、有机碳氮、有机酸、氨基酸和糖组成等的垂直分布可以得出以下结论：尽管内陆养鱼海湾的海底承受着来自残留诱饵和鱼类排泄物的高含氮量的有机悬浮物的沉重负荷，水域底泥的有机污染可通过以下过程进行：1)底面有机悬浮物的沉积；2)水底表层的分解和矿化；3)海水的富营养化；j)浮游植物的生长；5)浮游植物死体的沉积；6)底泥的有机污染。

One of the most undesirable environmental conditions infish-culturing inland Bays might be the formation of oxygen deficient layer in bottom water in summer saeason.Toward an aid of the solution of the problem,wetried to elucidate the mechanism of organic polution of bottom sediment in fish-farm inland bays,comparin with that in usual eutrophicated water regions. From the vertical distributions of plant pigments,organic carbon and nitrogen,organic acids,aminoacid and sugar composition of organic substances in the bottom sediment,etc.in the two kinds of organic poluted water regions,the following inference can be drawn from the results obtained in this study.Namely,even though the sea bottom of fish-culturing inland bays are subjected to heavy loads of organic suspended matter with high nitrogen content which is derived from remaining bait and fish excretion,organic polution of the bottom sediment in the water region may proceed by th processes 1) sedimentaion of organic suspended matter on the bottom surface 2) decomposition and mineralization in the water-bottom surface layer 3) eutrophication of sea water j) growth of phytoplanktion 5) sedimentation of dead bodies of phytoplanktion 6) organic polution of bottom sediment.