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This paper presents the concentrations of petroleum hydrocarbons in seventeen important commercial fish species, i.e.

The present investigation was designed to determin of residual of petroleum hydrocarbons in seawater and sediments from Aden coasts, Yemeni, during April 2004. Additional hydrographic data such as air and water temperatures, salinity, dissolved oxygen, pH and total alkalinity were also determinated in order to give a better appraisal of survey data. The mean concentrations of residual petroleum hydrocarbons in seawater were varied from 19ng/ l at Al-Omal Island to 239ng/l at free area and in sediment from 9ng/g at Al-Omal Island to 45 infront of refinery. The study revealed comparable level of petroleum hydrocarbons in this region to that reported for other parts of the world, which showed no pollution with petroleum hydrocarbons

The distribution of inorganic nutrient salts (ammonium, nitrite, nitrate, phosphate and silicate) and phytoplankton chlorophyll-a (Chl-a) were investigated in the Gulf of Aden and along the Arabian Sea coast, Yemen. Seventy two surface water samples were collected during cruises in August 2014 and January 2015. The sampled area extends from As Suqayyah in the west of the Gulf of Aden to Hawf in the east. The study showed that the average values of nutrient salts (μg/l) in waters collected in August 2014 and January 2015 were 0.83 and 0.60, 10.98 and 10.03, 16.41 and 14.73, 10.36 and 8.76, and 29.72 and 22.67 for ammonium, nitrite, nitrate, phosphate and silicate, respectively. The average values of Chl-a (mg/m3) in August 2014 and January 2015 were 0.26 and 0.21, respectively. The results showed that nitrate levels were very high but those of ammonium very low. This may reflect the oxidation of ammonia to nitrite and then nitrate, leading to a very favorable ratio of ammonia and nitrate values. The low levels of dissolved inorganic nitrogen (DIN)compounds, (ammonium, nitrite, and nitrate), phosphate, silicate and Chl-a indicated that the southern coast of Yemen is not in a eutrophic condition. The highest nutrient salt values were in the eastern part of the study area, and may have resulted from water originating from the Indian Ocean and upwelling. Statistical analysis to seek correlations between nutrient salts and Chl-a show very good to excellent correlation, which may be due toconstant coastal environment.

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