Investigation of Acanthocephalan parasites in some marine fishes as a bio-indicator for heavy metals pollution

Document Type : Original Article

Authors

1 Faculty of Vetrenary Medicen, Suez Canal University

2 Department of Fish Diseases and Management Animal Health Res. Institute (Ismailia Branch).

Abstract

A total of 120 marine fish as (60 Siganus revulatus and 60 Mulloides flavolineatus) were collected from Suez Canal area at Suez Governorate to investigatethe presence of acanthocephalan parasites and its relation with some heavy metals. Residues of lead (Pb), zinc (Zn), copper (Cu), cadmium, (Cd) and iron (Fe) were detected in water, acanthocephalan parasites and in the organs of infested and non-infested fishes (livers, gills, and musculature) of the examined fishes using atomic absorption spectrophotometer. The clinical picture of naturally infested fishes showed no pathognomonic signs except abdominal distension or emaciation in some fishes. Postmortem lesions were in pale liver and internal organs with presence of acanthocephalan in the opened viscera or perforated intestine. Some cases showed congestion in the liver with petechial hemorrhage. The total prevalence of infested fishes with acanthocephalans was 30%. The isolated Acanthocephala were identified as Neohydinorhynchus macrospinosus fromS. revulatus 36.66 % and Echinorhynchus sp., Serrasentis sagittifer from M. flavolineatus 23.33%. The morphological descriptions of each isolated parasites were described.
The present study indicated that the average of heavy metal residues in organs of the infested fishes were lower than its residues in organs of the non-infested fishes. Also, the acanthocephalan parasites are able to accumulate heavy metals in their tissues higher than fish tissues and 
could be considered as a bio-indicator for heavy metals pollution besides being a competitor to fish organs for heavy metals accumulation.
The obtained results of heavy metals in the edible parts of the fish demonstrated at the safe levels for human consumption and its concentrations in the musculature are generally accepted by the worldwide enactment limits.

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A total of 120 marine fish as (60 Siganus revulatus and 60 Mulloides flavolineatus) were collected from Suez Canal area at Suez Governorate to investigatethe presence of acanthocephalan parasitesand its relation with some heavy metals. Residues of lead (Pb), zinc (Zn), copper (Cu), cadmium, (Cd) and iron (Fe) were detected in water, acanthocephalan parasites and in the organs of infested and non-infested fishes (livers, gills, and musculature) of the examined fishes using atomic absorption spectrophotometer. The clinical picture of naturally infested fishes showed no pathognomonic signs except abdominal distension or emaciation in some fishes. Postmortem lesions were in pale liver and internal organs with presence of acanthocephalan in the opened viscera or perforated intestine. Some cases showed congestion in the liver with petechial hemorrhage. The total prevalence of infested fishes with acanthocephalans was 30%. The isolated Acanthocephala were identified as Neohydinorhynchus macrospinosus fromS. revulatus 36.66 % andEchinorhynchus sp., Serrasentis sagittifer from M. flavolineatus 23.33%. The morphological descriptions of each isolated parasites were described.
The present study indicated that the average of heavy metal residues in organs of the infested fishes were lower than its residues in organs of the non-infested fishes. Also, the acanthocephalan parasites are able to accumulate heavy metals in their tissues higher than fish tissues and

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