Uptake of Hydrocarbon Pollution by Fish Eggs and Larvae أثر التلوث البترولي على بيض ويرقات الاسماك

The current study took place in the middle and northern parts of the Firth of Forth, Western North Sea. The main objective of this study is to detennine the concentrations of total hydrocarbons (mg/1) in seawater (0.0 m and 1.0 m depths), fish eggs and larvae during the period March- May, 1988. Different concentrations of crude oil (0.124-2.480 mg/1) were used as standards. The intensities of each water sample were measured by an Ultra-Violet Fluorescence (UVF). Selected samples were then examined by gas chromatography. The highest mean values taken from surface water samples were found in March (0.34 mg/1), followed by May and April, with mean concentrations ofO.19mg/1 and 0.09 mg/1 being recorded respectively. Similar patterns of distribution were found at 1.0 m depth. The mean values recorded were 0.28 mg/1, 0.14 mg/1 and 0.07 mg/1 for March., May and April respectively. All values of hydrocarbons in March and May were hi~er at the surface than at 1.0 m. In April, hi~er concentrations were recorded at 1.0 m than at the surface. The results also show higher values of hydrocarbons in March than any other period. While the highest concentrations of hydrocarbons detected in fish eggs during March were 26.43 lLg/g, the lowest concentrations of hydrocarbons were 19.82 lLg/g. The highest concentrations of hydrocarbons recorded in April were 33.611Lg/gw, hile the lowest valuesw ere 20.46l Lg/g. In May, the highest and lowest concentrations found in fish eggs were recorded as 30.82 lLg/g and 4.081Lg/g respectively. The concentrations of hydrocarbons in fish eggs may reflect those found in surface seawaters. Hydrocarbon concentrations in fish larvae could not be detected in all ~amples analysed during either March or May. The highest concentrations of total hydrocallbons were found in fish larvae collected during the month of April. تمت هذه الدراسة في منتصف وشمال الفيرث ، غرب بحر الشمال، وأهم أهداف هذه الدراسة هو تعيين نسبة تركيزات مشتقات البترول في ماء البحر ( عينات سطحية ومن عمق واحد متر ) وكذلك الموجودة في بيض ويرقات الأسماك خلال الفترة ( مارس ـ مايو 1988م) ، فقد جمعت عينات بيض ويرقات الأسماك بواسطة شباك البونجو، كما قيست التراكيزات بواسطة الأشعة فوق البنفسجية واختيرت بعض العينات لقياسها بواسطة الغاز كروماتوجرافي .