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Studies on host-parasite systems as bioindicators for monitoring trace metal pollution in marine environments are still scarce. Here, 11, 14 and 17 infrapopulations of  Gyliauchen volubilis  (Trematoda: Digenea),  Procamallanus elatensis  (Nematoda) and  Sclerocollum rubrimaris  (Acanthocephala), respectively, were collected from the fish  Siganus rivulatus  (Siganidae) in the Red Sea, from a chronically polluted small bay at Sharm El-Sheikh, South Sinai, Egypt. Water and sediment samples from the bay, tissue samples (intestines, liver, and muscle) from each fish, and samples from each parasite were taken for heavy metal analyses of cadmium and lead. Cadmium concentrations in intestines, liver and muscle of non-infected and infected fishes were much lower than those of lead, and both metal concentrations decreased in the order: liver > intestines > muscle. Cadmium and lead concentrations in the tissues of fishes infected with  G. volubilis  or  P. elatensis  were slightly lower than those in non-infected ones, while in the tissues of fishes infected with  Sc. rubrimaris , they were much lower. Low concentrations of cadmium and lead in  G. volubilis  and  P. elatensis  are associated with their limited ability or capacity to accumulate trace metals. Therefore, bioconcentration factors corresponding to these species were relatively low, and both are herein considered as weak bioindicators. By contrast, high concentrations of cadmium and lead in  S. rubrimaris  are associated with its high ability to accumulate trace metals. Of the present three host–parasite systems, only the  Siganus rivulatus – Sclerocollum rubrimaris  system seems to be promising for biomonitoring of metal pollution in the Red Sea.

parasite

Environmental Parasitology: intestinal helminth parasites of the siganid fish<i>Siganus rivulatus</i>as bioindicators for trace metal pollution in the Red Sea

Environmental Parasitology: intestinal helminth parasites of the siganid fishSiganus rivulatusas bioindicators for trace metal pollution in the Red Sea