[Evaluation of toxicity of crude oil on pearl oyster pinctada radiata and its effects of free omino acids in their hemolymph]

ABSTRACT

In this project, the toxicity of crude oil of the Siri Island on the Pearl Oyster, species Pinctada radiata have been investigated. The speciemens were collected from [Nakhilu port] one of the Persian Gulf fishing ports. In the beginning, a range finding test had been done to examine the sensitivity of pearl oyster to oil pullution, then another test bioassayed. The toxicity of the crude oil in 96 hrs. In this second test concentrations of 10, 50 and 100 percent of water soluble fractins [WSF] of crude oil have been used and the end of this test, there was no mortality in any of the treated groups, even in 100 percent concentration of WSF during the 96 hours. Therefore it became clear that these Oyster have perfect resistance against different concentration of water soluble fractions of crude oil. In the second part of this project, considering the work of Roeisijadi and Anderson [1979], the short term stress effect of the oil pollutin and amount of free amino acids in hemolymph, which usually is considered as a stree indicator was examined. Again, the above experimental groups were examined and the results indicated that after 96 hrs, there were no significant difference in concentration of free amino acid