Contamination of Lekki lagoon by petrogenic chemicals such as polycyclic aromatic hydrocarbons (PAH) and benzene, toluene, ethylbenzene, and xylene (BTEX) has been widely reported. The study was aimed at investigating the bioaccumulation of PAH and BTEX in Malapterurus electricus collected from Lekki lagoon in Lagos, Nigeria. BTEX was analyzed in the intestine, water, and sediment samples using 8260B Agilent 7890B gas chromatograph coupled to a mass spectrometer (GC-MS). While PAHs were tested in the same media using a gas chromatograph coupled to a flame ionization detector (GC-FID). Histopathological analysis of the fish intestine was conducted using haematoxylin and eosin (H&E) stains. Parasite intensity, antioxidant enzymes, and lipid peroxidation activities were investigated in the fish. The parasitic infection detected in Malapterurus electricus was Electrotaenia malopteruri. The parasite showed weak and no depurative capacities for BTEX and PAH respectively. The decrease in superoxide dismutase (SOD), catalase (CAT), and reduced glutathione (GSH) in conjunction with an increase in Malondialdehyde (MDA) characterized relatively higher susceptibility among the male fish. Varieties of tissue injuries increased with the standard length of the fish groups. Results suggest that lengthier and uninfected M. electricus were more susceptible to PAH in Lekki lagoon than the shorter and infected ones. The study demonstrated a promising tendency of the enteric parasite, E. malopteruri to depurate chlorobenzene, ethylbenzene, o-xylene, m+p-xylene, and 1,4-dichlorobenzene from the intestine of its host fish, M. electricus, while PAHs were poorly mediated by the parasite.

中文翻译：

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从尼日利亚拉各斯Lekki泻湖取样的电马拉普特氏菌（Siluriformes：Malapteruridae）及其肠寄生虫，Electaltaen malopteruri中PAH和BTEX的比较生物富集

广泛报道了岩石化学物质如多环芳烃（PAH）和苯，甲苯，乙苯和二甲苯（BTEX）对莱基泻湖的污染。该研究旨在调查从尼日利亚拉各斯的莱基泻湖收集的电马拉普勒氏菌中PAH和BTEX的生物蓄积性。使用与质谱仪（GC-MS）耦合的8260B Agilent 7890B气相色谱仪分析了肠，水和沉淀物中的BTEX。虽然使用与火焰离子化检测器（GC-FID）耦合的气相色谱仪在相同的介质中测试了PAH。鱼肠的组织病理学分析使用苏木精和曙红（H＆E）染色剂进行。在鱼中调查了寄生虫的强度，抗氧化酶和脂质过氧化活性。在电巨螯虾中检测到的寄生虫感染是毛鳞蝇。寄生虫对BTEX和PAH分别显示弱和无净化能力。超氧化物歧化酶（SOD），过氧化氢酶（CAT）的减少和谷胱甘肽（GSH）的减少与丙二醛（MDA）的增加有关，在雄鱼中具有较高的敏感性。各种组织损伤随鱼群标准长度的增加而增加。结果表明，更长和未感染的电分支杆菌比Lekki泻湖中的PAH更易感染PAH。该研究表明，肠道寄生虫E. malopteruri会从其寄主鱼M.electricus的肠道中纯化出氯苯，乙苯，邻二甲苯，间+对二甲苯和1,4-二氯苯，这是一种有前途的趋势。