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<p>Contamination by metals is among the most pervasive anthropogenic threats to the environment and the health of higher-trophic-level species. Metal concentrations in the tissues of <i>Squalus megalops</i> and <i>Raja radula</i> collected from Bizerte Bay and the Gulf of Gabes between November 2022 and November 2023, and their respective cestode parasites, <i>Gilquinia robertsoni</i> and <i>Echinobothrium affine,</i> were analyzed using an inductively coupled plasma optical emission spectrometer and a direct mercury analyzer. Cadmium (Cd) and lead (Pb) concentrations in the muscle tissue of both elasmobranchs exceeded legislated thresholds. Mercury (Hg) concentrations in <i>S. megalops</i> muscle surpassed the standard limits. <i>Gilquinia robertsoni</i> accumulated zinc (Zn) and manganese (Mn) 10 and 13 times higher than its host muscle, and Mn four times higher than its host’s intestine in Bizerte Bay. In the Gulf of Gabes, it accrued higher concentrations than in <i>S. megalops</i> muscle (six times for copper (Cu); seven times for Pb and Mn; and three times for Zn). Pb was about 56 times higher in the parasite than in the intestine of the fish. <i>Echinobothrium affine</i> accumulated Cu, Fe approximately four times higher, and Pb seven times higher than the muscle of <i>R. radula</i> in Bizerte Bay and stored Pb respectively 10 and 22 times higher than the host’s intestine and liver. In the Gulf of Gabes, higher concentrations of some metals were in <i>E. affine</i> than those in the host muscle (seven times Cu and Pb and five times Fe), host intestine (four times cadmium (Cd) and 12 times Pb), and host liver (six times Pb). In this regard, <i>G. robertsoni</i> and <i>E. affine</i> can be considered sensitive bioindicators of metal pollution in marine ecosystems.</p>

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Cestode parasites of Squalus megalops and Raja radula as metal contamination indicators in the northern and the southern seawaters of Tunisia

  • 期刊论文

  • 发表日期：

    2025年10月9日

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  • Khouloud Maghraoui,
  • Wafa Boulajfene,
  • Sihem Bahri

摘要

Contamination by metals is among the most pervasive anthropogenic threats to the environment and the health of higher-trophic-level species. Metal concentrations in the tissues of Squalus megalops and Raja radula collected from Bizerte Bay and the Gulf of Gabes between November 2022 and November 2023, and their respective cestode parasites, Gilquinia robertsoni and Echinobothrium affine, were analyzed using an inductively coupled plasma optical emission spectrometer and a direct mercury analyzer. Cadmium (Cd) and lead (Pb) concentrations in the muscle tissue of both elasmobranchs exceeded legislated thresholds. Mercury (Hg) concentrations in S. megalops muscle surpassed the standard limits. Gilquinia robertsoni accumulated zinc (Zn) and manganese (Mn) 10 and 13 times higher than its host muscle, and Mn four times higher than its host’s intestine in Bizerte Bay. In the Gulf of Gabes, it accrued higher concentrations than in S. megalops muscle (six times for copper (Cu); seven times for Pb and Mn; and three times for Zn). Pb was about 56 times higher in the parasite than in the intestine of the fish. Echinobothrium affine accumulated Cu, Fe approximately four times higher, and Pb seven times higher than the muscle of R. radula in Bizerte Bay and stored Pb respectively 10 and 22 times higher than the host’s intestine and liver. In the Gulf of Gabes, higher concentrations of some metals were in E. affine than those in the host muscle (seven times Cu and Pb and five times Fe), host intestine (four times cadmium (Cd) and 12 times Pb), and host liver (six times Pb). In this regard, G. robertsoni and E. affine can be considered sensitive bioindicators of metal pollution in marine ecosystems.