Species of Organotins in Imposex of Rock Shells and Hermaphroditic Oysters from the Western Coast of Taiwan

The amounts of organotin compounds such as butyltins [BTs: tributyl- (TBT), dibutyl- (TBT), monobutyl- (MBT)] and phenyltins [PhTs: triphenyl- (TPhT), diphenyl( OPhT), monopheny- (MPhT)] in rock shells, Thais clavigera, and oysters, Crassostrea gigas, collected from the western oyster mariculture areas in Taiwan varied with sexual (male, female as well as imposex of rock shells and hermaphroditic of oysters), season and location. After examining 1206 individuals of rock shells in summer (August 1999), autumn (November 1999) and winter (January 2000), the percentages of female at Shiangsan, Lukang and Chiku areas were decreased from 47.7%, 32.7% and 66.4% in summer to 1.4%, 3.2% and 43.7% in winter while the degree of imposex were increased from 36.9%, 40.0% and 16.4% in summer to 98.6%, 96.8% and 52.1% in winter, respectively. The higher the concentrations of BTs (mainly TBT) in rock shells, the higher percentages of degree of imposex on rock shells were observed. Extremely high concentrations of BTs (821±69 ng/g; mainly TBT, 611±26 ng/g) were observed in imposex of female at Shiangsan in winter. Relatively high concentrations of PhTs (143±26 ng/g; mainly TPhT (69±13 ng/g) and DPhT (58±12 ng/g) were found in male at the same site in summer. Similar trend with rock shells, the distributions of BTs [as high as 441±30 ng/g; mainly T8T (325±31 ng/g)] and PhTs [as high as 549±18 ng/g; mainly T8T (527±13 ng/g)] in oysters were found in hermaphroditic compared with those values in female and male. Good linear positive significant relations (p＜ 0.05 to 0.001) between organotin compounds, such as TBT, DBT, BTs and PhTs, in both oysters and rock shells were obtained. High TBT in oysters and rock shells in winter were caused by both environmental parameters (the pollution sources, such as antifouling paints from harbors, ship building and petro-chemical industries) and the biological factors (such as growth rate, spawning activity, etc.). High PhTs in animals in summer were due to the high consumption of fungicides in summer compared with those in winter. The season of oysters maturity and spawning activity in Taiwan related to organotins contents were also discussed.

並列關鍵字

Species of organotins ； Imposex and hermaphroditic ； Male and female ； Rock shell ； Oysters ； Taiwan

國際替代計量

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