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<br />Nopcocide/C hlorothaloni 1 <br />Zinc metal <br />Preventol A4/Dichlofluanid <br />Zinc naphthenate <br />Densil <br />Zineb <br />Pyridinetriphenylborane <br />Mancozeb <br />Thiram <br />Maneb <br />C~ <br />Effects Data. As mentioned above, appropriate (i. e., high quality and <br />published) acute and chronic toxicity data for TBT are currently <br />available for 29 and 7 marine species, respectively. As Table 2 <br />shows, considerably fewer toxicity data are available for the organic <br />booster biocides. This lack of toxicity data virtually eliminates the <br />ability to assess the comparative risks between these antifoulants and <br />TBT. With such limited toxicity data, particularly chronic toxicity <br />data, it is not possible to assess risks to the aquatic community and it <br />is not possible to know if sensitive species have been adequately <br />tested. TBT is a good example of this last point. The toxicity of TBT <br />was underestimated until about the mid-1980s when chronic tests of <br />some less standard species demonstrated that TBT was more toxic <br />than previously thought. Although TBT was found to be more toxic <br />than thought, the data provided the impetus for regulations on TBT <br />usage. As the TBT risk assessment demonstrated (Cardwell et al. <br />1999), these regulations helped reduce risks from TBT to acceptable <br />levels. This same scenario could occur with a new biocide, i.e., it <br />may be more toxic than originally thought given that the toxicity data <br />are so limited. Additional toxicity testing with these compounds will <br />be necessary if a comparative risk assessment with TBT is to be <br />meaningful. <br />Table 2. Number of marine species tested with different organic <br />