| Summary: | 碩士 === 國立臺灣海洋大學 === 環境生物與漁業科學學系 === 95 === The recreational fishery is widely accepted in recent years. Many people enjoy angling in the inside harbour. But, angling in inside harbour is prohibited for a long time, until 2006 the embargo is removed and the Bi-Sha Harbour and Waimushan Harbor are opened to provide people an area for recreation. Because these harbours may be polluted by organotin compounds derived from antifouling paints in outer vessel hull, the crab catches may bio-accumulate some of organotin compounds. Therefore, if people take such crab as foods, they will fall into the crisis of organotin pollution. As a result, this study obtains sediment samples and crab samples in the inside harbour experimental stations, aims to analyze the organotin compounds concentration of sediments samples and crab samples and to assess the crisis of such crab foods.
The results show that concentration of butyltins (BTs) compounds of sediments in Waimushan Harbor (160.57~2469.27 ngs/g) is higher than those in Bi-Sha Harbor (63.32~1489.03 ng/g), and the highest composition of BTs compounds is TBT.
The concentration of BTs (34.43~1227.07 ng/g) in crab organisms in the Waimushan Harbor is higher than those in Bi-Sha Harbor (10.10~88.90 ngs/g). It shows that BTs pollution in the Waimushan harbor is more serious than Bi-Sha Harbor.
The bio-accumulation concentration (5.44~1182.47 ng/g) of BTs in the viscera of crab catches is higher than those in the muscle (4.66~47.10 ng/g), the average BTs differs 1.3 fold.
In two ports, sum of TBT and DBT of each crab sample is from the 9.67 to 454.32 ng/g, average 60.02 ng/g, lower than the TARL (tolerable average residue levels) of the risk valuation. It shows that taking the two harbors’ crab catches as foods will not cause bane to the human body.
Keywords: tributyltin, dibutyltin, monobutyltin, crab catches, sediments, Waimushan Harbor, Bi-Sha Harbo, risk assessment of crab foods.
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