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Heavy metal contents of Anisops sardeus sardeus HerrichSchaeffer collected from polishing and facultative lagoons in Ismailiya Wastewater Treatment Plant, Egypt, were analyzed by AAS. This species is studied for the first time as a biomonitor of heavy metals in water and sediment. The average concentrations of heavy metals in insect tissues found in facultative lagoon vs. the polishing lagoon were: Zn 197,147.4; Cd 2.7,1.5; Cu 28.2,13.7; Co 37.7, 34.4; Pb 59.7, 57.8; Ni 36.9, 25.1 |ig/g dry weight respectively. With the exception of lead, the differences in concentrations of each metal were statistically significant. These concentrations of metals in the insect tissues corresponded to their concentrations in the two lagoons. The present study confirmed that Anisops sardeus sardeus from polishing lagoon is an excellent accumulator of Co and Pb as their concentrations reached 34.4 and 57.8 jig/g diy weight, respectively, than in water (9.1 and 41.0 mg/1) and sediment (29.0 and 42.0 }ig/g) samples. The bioaccumulation factor was 12.3, 1.5, 1.3, 3.8, 1.4 and 03 for Zn, Cd, Cu, Co, Pb and Ni, respectively. It is, thus, concluded that Anisops sardeus sardeus could be a very suitable accumulative bioindicator for the monitoring of heavy metals in surface water of wastewater treatment plant.

egyptian journal of aquatic biology and fisheries

ANISOPS SARDEUS SARDEUS HERRICH-SCHAEFFER (HETEROPTERA: NOTONECTIDAE) AS A BIOINDICATOR OF HEAVY METALS IN WASTEWATER TREATMENT PLANT AT ISMAILIYA, EGYPT