2006 Fiscal Year Final Research Report Summary
Microbial degradation of biodegradable plastics in sea-water and application to fishing implements.
| Project/Area Number |
16580146
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
General fisheries
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| Research Institution | Tokyo University of Marine Science and Technology |
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Principal Investigator |
KANEHIRO Haruyuki Tokyo University of Marine Science and Technology, Faculty of Marine Science, Professor, 海洋科学部, 教授 (80134857)
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| Co-Investigator(Kenkyū-buntansha) |
TOKAI Tadashi Tokyo University of Marine Science and Technology, Faculty of Marine Science, Professor, 海洋科学部, 教授 (30237044)
WATANABE Toshihiro Fisheries Research Agency, National Research Institute of Fisheries Science, Head of office, 水産工学研究所・漁法学研究室, 室長 (90344332)
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| Project Period (FY) |
2004 – 2006
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| Keywords | Biodegradable plastics / Ghost Fishing / Deep sea water / Extreme conditions / Low temperature and high-pressures / Decrease of strength / Microbial degradation |
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| Research Abstract |
An application of environmentally degradable plastics for fishing nets may help solve the ghost fishing problem. In this study, biodegradation of several aliphatic polyesters was studied in deep seawater under a low temperature of near 0℃. After one to twelve months of soaking in deep sea water, the filaments did not keep its original shape and the strength reached zero. The results suggested that the strength decreasing of these aliphatic' polyesters in deep seawater is caused by microbial degradation.
From the deep sea water in Toyama Bay and from the surface sea water in Tokyo Bay, each two polycaprolactone(PCL) degrading bacteria (Toyama04, Toyamal0 from Toyama deep sea water and TUF-1, TUF-2 from Tokyo Bay, respectively) were isolated. 16S rDNA analysis showed these strains belong to the genus Pseudomonas. Toyama04, Toyamal0 and TUF-2 were close to Arctic seawater bacterium R7366. TUF-1 was close to Pseudomonas pachastrellae. Two strains isolated from the surface water were inoculated into ZoBell 2216E agar medium and medium containing granulated PCL. Only TUF-1 increased, and the TUF-1 and TUF-2 did not degraded PCL. From these results, the application of biodegradable plastics for fishing gears is suggested to be effective in reducing ghost fishing problem by derelict fishing gear.
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