THE TOXICITY of GAS OIL and DISPERSANTS on the BARNACLE BALANUS AMPHITRITE AMPHITRITE DARWIN (CRUSTACEA: CIRRIPEDIA) from SHATT AL–ARAB RIVER, IRAQ

Abstract

The toxicity of gas oil and BP1100 dispersant to the larvae (nauplii) and adult barnacle Balanus amphitrite amphitrite was studied. The percentage of non motility and dead individuals of the nauplii and adults of the barnacle was directly proportional with the concentration and exposure time of the chemicals. The adults and nauplii of B. amphitrite amphitrite had a similar affectability to the BP 1100. The nauplii killed at lower concentration than the adults. Cirral activity of the adults barnacle was reduced when exposed to BP 1100. A comparison of the relative toxicity of the gas oil and three dispersants (BP1100, BP1100X and Corexit8666) to adult barnacle was also performed. The BP1100 was the most toxic dispersant, while BP1100X was the next most toxic dispersant. The remaining dispersant (Corexit8666) was relatively less toxic to the barnacle tested, while the gas oil was the least toxic.