Some Effects of Triphenyltin Chloride on Achnanthes subsessilis

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Abstract
Slimes in which the diatom A. subsessilis is the dominant fouling organism are commonly found on ships and panels coated with organotin-containing antifouling paints. Chlorophyll a and cell numbers were measured after treatment of cultured cells for up to 5 days with triphenyltin chloride (SnPh3Cl) [an effective biocide] Treatment of cells with SnPh3Cl for 1-2 h results in a greater degree of inhibition of H14CO3- fixation than treatment for up to 5 days in the same concentration of SnPh3Cl. Cells in which H14CO3- fixation is inhibited by 68% after 2 h treatment with SnPh3Cl are able to recover fully after 48 h in fresh medium without SnPh3Cl. The results are discussed in relation to the apparent success of A. subsessilis as a fouling organism.