1987 Fiscal Year Final Research Report Summary
Microbiochemical Studies on the Oxygen Deficient Layer in Inland Fish-farm Water Regions
| Project/Area Number |
61560241
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Fisheries chemistry
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| Research Institution | Kinki University |
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Principal Investigator |
KAWAI Akira Kinki University,Faculty of Agriculture,Professor, 農学部, 教授 (90027178)
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| Co-Investigator(Kenkyū-buntansha) |
EGUCHI Mituru Kinki University,Faculty of Agriculture,Research Asociate, 農学部, 助手 (40176764)
KITADA Hideo Kinki University,Faculty of Agriculture,Lecturer, 農学部, 講師 (50088192)
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| Project Period (FY) |
1986 – 1987
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| Keywords | Fish farm water region / Oxygen deficient layer / Bottom sediment / Plant pigments in bottom sediment / Amino acid and sugar composition / organic acids / 底泥の糖組成 / 低泥の有機炭素及び有機窒素 |
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| Research Abstract |
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.
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