|| The port of Kaohsiung which was the third largest harbor in the world previously is still the biggest one in Taiwan at present. Because of shipping coming from all over the world persistently and there are several shipyards and fishing ports in harbor, the harbor area is seriously polluted by organotin compound. Nevertheless, it is not understood whether the pollution of organotin affect the marine ecosystem around coastal areas out of harbor. The first goal of this study concerns about organotin contamination and distribution of the sediments and major benthic organisms around coastal areas out of harbor. The second one is to find the adequate indicator organism which fits for organotin contamination. Five major benthic organisms including Distorsio reticularis, Niotha conoidalis, Metapenaeopsis palmensis, Portunus argentatus and Portunus hastatoides were collected and investigated in this study.|
The organotin concentration of sediments in all stations was not detected totally. The organotin accumulations in Metapenaeopsis palmensis, Portunus argentatus and Portunus hastatoide are not obvious. In Portunus argentatus and Portunus hastatoide, both the contents of tributyltin (TBT) were not detected. In Metapenaeopsis palmensis, the concentration of TBT is between ND∼3.4 ng/g as tin. In Distorsio reticularis and Niotha conoidalis, organotin is measured in all station; monobutyltin (MBT) is the main composition of butyltins; TBT is less than 10 ng/g as tin. The concentration of butyltins in Niotha conoidalis decreased with the increased wet weight. There was no significant variation for organotin concentrations in Niotha conoidalis collected from each stations and seasons.
According to this study, the content of organotins in sediment around coastal areas out of harbor is obviously less than other coastal areas of large-scale harbors (Lisbon, Sines, Sagres, Huelva, Cadiz and Trafalgar). The organotin contamination around coastal areas out of harbor is not serious. Base on amounts, distributions and contents of organotin in organisms, Distorsio reticularis and Niotha conoidalis are better bethic indicator organisms than Metapenaeopsis palmensis, Portunus argentatus and Portunus hastatoides. Niotha conoidalis distributes over the depth less than 30 m, and therefore is a good indicator organism for this area. The facts that Distorsio reticularis distributes over the depth more than 30 m, suggest that it is a proper indicator organism for this area although lesser in population.