Authman Mohammad M N, Abbas Hossam H H
Department of Hydrobiology, Veterinary Researches Division, National Research Center, El-Bohooth St. Dokki, Giza, P.O. Box 12622, Cairo, Egypt.
Pak J Biol Sci. 2007 Jul 1;10(13):2106-22. doi: 10.3923/pjbs.2007.2106.2122.
This study was carried out on Lake Qarun, Fayoum Province, Egypt throughout four seasons, spring 2004 to winter 2005. The concentration of Zn in water as well as in fish organs was always higher than Cu. Correlations between concentration of heavy metals in water and fish organs were elucidated. The concentrations of heavy metals in fish samples indicated that Tilapia zillii were higher than those of Mugil cephalus, which is attributed to their feeding behavior. It was found that these metals have been accumulated in fish organs in different concentrations, which were much higher, several times in some cases, than those found in the surrounding water. The analysis of variance (ANOVA, 1-way analysis) for heavy metals in water and fish organs indicated significant difference. Bioaccumulation factor values showed that the trend of accumulation of metals in fish organs was apparent in liver, gills and muscle, respectively. Lesions deformations were detected and analyzed to clarify the possible role of water pollution on the efficiency of fish and hence the declining fish production of Lake Qarun. The results suggest that the Lake Qarun system is contaminated with heavy metals and the consumption of fishes of the Lake could pose health damage to the local population whose diet consists mainly of fish. A recommendation is given to rescue Lake Qarun from these serious ecological problems.
本研究于2004年春季至2005年冬季在埃及法尤姆省的卡伦湖开展，历时四个季节。水中以及鱼器官中的锌浓度始终高于铜浓度。阐明了水中重金属浓度与鱼器官中重金属浓度之间的相关性。鱼样本中的重金属浓度表明，吉利罗非鱼的浓度高于鲻鱼，这归因于它们的摄食行为。研究发现，这些金属以不同浓度在鱼器官中积累，在某些情况下，其浓度比周围水中的浓度高出数倍。对水中和鱼器官中的重金属进行方差分析（单因素方差分析）表明存在显著差异。生物累积因子值表明，金属在鱼器官中的积累趋势在肝脏、鳃和肌肉中分别很明显。检测并分析了病变变形情况，以阐明水污染对鱼类效能的可能作用，进而阐明卡伦湖鱼类产量下降的原因。结果表明，卡伦湖系统受到重金属污染，食用该湖的鱼类可能会对当地以鱼为主食的居民健康造成损害。提出了一项从这些严重生态问题中拯救卡伦湖的建议。
