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Therefore, this research aimed to evaluate the potential capacity of <jats:italic>Contracaecum quadripapillatum<\/jats:italic> larvae as accumulation indicators for metal pollution and compare metal concentrations in host tissues of non-infected and infected fish: <jats:italic>Lates nilotic<\/jats:italic>us from the Nile River. Accumulations of Cd, Cu, Fe, Mn, Ni, Pb, and Zn in larval nematodes and tissues of the liver, kidney, and muscles of both infected and non-infected fish were determined. All metal concentrations exhibit a significantly higher increase in larval nematodes than the muscles of infected fish and vice versa except Cd in the kidney. On the other hand, only Cd, Mn, Pb, and Zn concentrations were significantly higher in the parasite than in the host liver. Therefore, bioaccumulation factors were most obvious and effective in the muscles of infected fish than in the liver and kidney. <jats:italic>Contracaecum<\/jats:italic> larvae accumulate Cd and Pb more than other metals. The infrapopulation size of <jats:italic>C. quadripapillatum<\/jats:italic> correlated with metal concentrations in different host tissues, especially the kidney, while the correlations between metal levels in the tissues of both parasite and fish organs exhibit different patterns in each organ. The current work revealed that <jats:italic>C. quadripapillatum<\/jats:italic> larvae represent environmental monitors for metal pollution in the freshwater ecosystem.<\/jats:p>","DOI":"10.1007\/s10661-023-11156-2","type":"journal-article","created":{"date-parts":[[2023,4,2]],"date-time":"2023-04-02T16:51:30Z","timestamp":1680454290000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Biomonitoring of heavy metals using Contracaecum quadripapillatum (Nematoda) in comparison to its fish host, Lates niloticus, from the Nile River, Egypt"],"prefix":"10.1007","volume":"195","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4495-7985","authenticated-orcid":false,"given":"Hasnaa","family":"Thabit","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2023,4,1]]},"reference":[{"issue":"2","key":"11156_CR1","first-page":"13","volume":"4","author":"J Abah","year":"2016","unstructured":"Abah, J., Mashebe, P., & Onjefu, S. 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