Table 8 



Relative Toxicities of Oils, Their Water-Soluble Fractions and Specific 

 Hydrocarbons on Two Species of Marine Animals. 



*OWD is oil- water dispersion, WSF is water-soluble fraction. 



returned to oil-free sea water, released the accumulated petroleum 

 hydrocarbons rapidly. A few days or weeks were required for complete 

 depuration. Oysters and clams, on the other hand, released the ac- 

 cumulated hydrocarbons very slowly, requiring in some cases, one 

 to two months for complete depuration. 



The fish, Fundulus similus, showed varying degrees of tolerance to 

 exposure to the water-soluble fraction of No. 2 fuel oil. The less tol- 

 erant fish accumulated substantially higher concentrations of naph- 

 thalenes in their tissues than did the tolerant fish. The sensitive fish 

 had particularly high concentrations of naphthalenes in the gall blad- 

 der, heart, liver and brain. The results strongly suggest that the sen- 



28 



