Shell thickening in Crassostrea gigas: Organotin antifouling or sediment induced? |
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| Authors: | MJ Waldock JE Thain |
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| Institution: | Ministry of Agriculture, Fisheries & Food, Directorate of Fisheries Research, Fisheries Laboratory, Burnham-on-Crouch, Essex, CM0 8HA, UK |
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| Abstract: | Crassostrea gigas spat were cultured for 8 weeks in the presence of a mixed algal diet in experimental tanks containing bis (tributyl tin) oxide (TBTO) alone, TBTO and a marine sediment, or a marine sediment alone. Growth measurements taken on a weekly basis showed enhanced weight gain in oysters exposed to nominal 50 and 100 mg l?1 concentrations of marine sediment alone. Spat in low level TBTO treatments (0.15 μg l?1) grew less well than the controls and showed pronounced thickening of the upper shell valve. High levels of TBTO (1.6 μg l?1) severely inhibited oyster growth. Tissue concentrations of TBT compounds were measured at the end of the experiment. Bio-concentration factors of 3000- and 10000-fold were demonstrated for the high and low TBTO treatments respectively. |
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