碩士 / 國立高雄海洋科技大學 / 漁業生產與管理研究所 / 97 / Marine sessile organisms that adhere to fishing gears and buoys are one of major concerns to fishery industry, especially to set-net fishery and marine cage culture. Studies on the methods to reduce or prevent such type of attachment are valuable. Set-net and cage farming fisheries play an important role in fishery industry in Taiwan, as well as its fishing equipment, buoys. This study aims to develop a nanometer (TiO2) photo-catalyst coating technology for traditional ABS plastic buoys to reduce the adherence of sessile organisms to the buoys.
This study divides marine experiments in situ into two testing stages from 1st March to 31st December 2008. Study sites were the Hanyuan set-net fishing ground located in the northwest Taiwan and Mangfong set-net fishing ground located in the southwest Taiwan. The primary research results of the first stage (nano-float including TiO2 of 1%, 2% and 3%) and the second stage (nano-float including TiO2 of 3%, 6% and 9%) are as follow.
1.The experimental groups and control groups of buoys in the first
and second stage at the Hanyuan set-net fishing ground were both
attached with sessile organisms, comprising 50~100%, the
difference ranges from 12.5% to 25%. However, the condition of
adherence of sessile organisms to the buoys in the second stage
has remarkable improvement with less variety, main fouling
organisms are Chlorodesmis sp. and Gigartina intermedia, etc.
There is no significant difference (p>0.05) in the two experiments
in situ.
2.The experimental groups and control groups of buoys in the first
and second stage at the Mangfong set-net fishing ground were both
attached with sessile organisms, comprising 50~75 %, the
difference ranges from 12.5% to 25%. The condition of adherence of
sessile organisms to the buoys in the second stage has no
difference from the first stage, main fouling organisms are
Balanus amphitrite and Dermonema frappieri, etc.
There is no significant difference (p>0.05) in the two experiments
in situ.
3.To synthesize, although the percentage of adherence to the buoys
of the experimental groups in both stages could not achieve the
expected result to prevent sessile organisms adherence, but the
result indicated that buoys with higher percentage of nano TiO2
have less adherence of sessile organisms. On the other hand, the
variety of adherence organisms in the second stage is less than
the first stage, and most of them are phyto-sessile organisms.
This may due to the nano TiO2 component has different level of
effect on certain sessile organisms.
Regarding the percentage of adherence of sessile organisms in two testing sea areas, the percentage at the Hanyuan is higher than the Mangfong set-net fishing ground, possibly due to the Hanyuan has waters from both mainland China current in Taiwan Strait and rivers from land. In addition, the testing sea area is shallow with slow current, and the wave turbulences make it easier for nutrients from seabed goes upwards to sea surface, which fosters the development of sessile organisms.
This study may be limited by the uneven mixture of nano TiO2 and plastics, or the low percentage of nano TiO2 that was not enough to reach the characteristics of nano TiO2 during the research process. Nevertheless, the research result has importance in the fishery industry and provides a valuable base for further research and development.
| Identifer | oai:union.ndltd.org:TW/097NKIM8451019 |
| Date | January 2009 |
| Creators | Jen-Chun Hsu, 許仁駿 |
| Contributors | Huoo-Yuan Jenq, 鄭火元 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 89 |
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