Petroleum pollution of the ocean arises from activities undertaken to meet energy requirements such as extraction, transport, and general uses of petroleum products. Marine transport of oil has greatly increased over the past few decades and oil spills affect the living and non-living resources of the surrounding areas. In this study, the effectiveness of pear in the remediation of oil contaminated water was tested and the in-vessel bioremediation of the oil contaminated pear was evaluated. The results indicated that kiln dried pear is an excellent absorbent for extracting oil from water It has the ability to remove 99.998% of the oil from contaminated water having an oil slick of 1.3 cm in depth. Mixing the peat with the contaminated water allowed for the coagulation of the pear with oil, and thus increased the oil removal efficiency, but also increased the moisture content of the peat. Evidence of three microbial populations (psychrophilic, mesophilic and thermophilic) in the bioreactor demonstrated the potential of the in-vessel bioremediation process to achieve a much higher oil degradation efficiency at a lower cost compared to biopiling and lasd farming. The worming of the material in the bioreactor and the increased moisture content were signs of the conversion of complex organic carbon by these microbes into energy, CO2 and H2O. Higher temperatures caused by mesophilic and thermophilic activities resulted in a higher conversion rate. The moisture content, pH and the aeration rare were within the optimum range for the bioremediation process. The poultry manure provided all the required nutrients for microbial growth, bur nitrogen appeared to be the limiting factor: The bioremediation process achieved 56.7% reduction in oil content in about twelve days. Addition of a nitrogen source would have resulted in a much higher reduction percentage. The original humic mixture was reduced to a denser but porous material that looked like a garden soil with a dark brown color and no oil odor.