Dynamics of metal uptake and depuration in a parasitized cyprinid fish (Rastrineobola argentea)

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dc.contributor.author Okoth, Elijah O.
dc.contributor.author Admiraal, Wim
dc.contributor.author Osano, Odipo
dc.contributor.author .Kraak, Michiel H.S
dc.contributor.author Kogogo, Pamela J.A.Were
dc.contributor.author Gichuki, John
dc.contributor.author Ngure, Veronica
dc.contributor.author Makwali, Judith
dc.contributor.author Ogwai, Caleb
dc.date.accessioned 2018-11-15T13:13:56Z
dc.date.available 2018-11-15T13:13:56Z
dc.date.issued 2012
dc.identifier.uri http://ir.jooust.ac.ke:8080/xmlui/handle/123456789/2777
dc.description.abstract Infestation of fish by endoparasites may potentially influence metal uptake and elimination by the host. We quantified the metal uptake rate constant (ku) and efflux rate constants (ke) of radiolabeled Cd and Co in the cyprinid fish Rastrineobola argentea experimentally infected with the parasite Ligula intestinalis. During 24 h, the accumulation of Cd and Co increased linearly with no evident steady state in uninfected fish, infected fish and in the parasite. Following aqueous exposures, the ku for Cd in parasites was about 3× higher than that of infected fish and 6× higher than for the uninfected fish. The ku for Co was up to 15× higher in the parasites than that of infected fish and 7.5× higher than for the uninfected fish. The ke for excretion of Cd were consistently higher for the uninfected fish than for the infected fish and also higher for uninfected fish than the parasite. The ke for Co for the uninfected fish was 1.4–2.0× lower than in the infected fish, but higher for parasites compared to uninfected fish (1.3–2.3×). Pulse-chase feeding experiments with radiolabeled copepods showed that Cd assimilation efficiency from food was higher in infected fish, while Co was assimilated more effectively by uninfected fish. The observed differences in metal dynamics between infected and uninfected R. argentea in the laboratory concord with differences in metal concentrations measured in natural populations in Lake Victoria. Our findings provide evidence that L. intestinalis infection enhances Cd accumulation, but depletes the essential Co in the cyprinid fish R. argentea. We conclude that the combined stress of parasites and pollution changes metal risks to fish hosts in a metal specific manner. Highlights ► Infestation of fish by endoparasites may influence metal uptake and elimination by the host. ► We quantify metal uptake rate constant (ku) and efflux rate constants (ke) of radiolabeled Cd and Co in parasitzed fish. ► ku for Cd was higher in infected than in uninfected fish, while the ku for Co was higher in uninfected fish. ► ke for Cd was higher in uninfected fish, while the ke for Co was higher in infected than in uninfected fish. ► Parasite infection enhances Cd accumulation, but depletes Co in the cyprinid fish. en_US
dc.language.iso en en_US
dc.publisher Elsevier en_US
dc.subject Biokinetic model en_US
dc.subject Cyprinid fish en_US
dc.subject Metal uptake en_US
dc.subject Metal depuration en_US
dc.subject Parasites en_US
dc.title Dynamics of metal uptake and depuration in a parasitized cyprinid fish (Rastrineobola argentea) en_US
dc.type Article en_US


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