Effect on catfish (Clarias lazera) composition of ingestion rearing water contaminated with lead or aluminum compounds.
To study the effect of contaminated rearing water of catfish (Clarias lazera) with lead acetate, lead chloride or aluminum chloride, 3 level of concentrations (10, 50 and 100 ppm) of each salt were added in the rearing water for 6 weeks. The results of this experiment confirmed the followings: Existence of deaths among fishes reared in water contaminated with the inorganic pollutants (PbCl2 and AlCl3) but not with the organic lead. The treatments led to pathological findings e.g. haemorrhages and congestion of the gastrointestinal tract and kidneys. Protein content was decreased insignificantly (P greater than or equal to 0.05) than for the control. The decrease was accompanied with the elevation of contamination level, especially in the lead acetate treatment. The ether extract increased in the treated fish than in the control. The increase was related to the pollutant level especially in the PbCl2 and AlCl3 treatments (P less than or equal to 0.01). Gross energy, generally, increased slightly by the application of the pollutants than in the control fishes. Muscular contents of ash, calcium, magnesium, and lead were increased significantly than the control. The contents of Na, K (P less than or equal to 0.01) and P (P less than or equal to 0.05) decreased in the treated fishes.[1]References
- Effect on catfish (Clarias lazera) composition of ingestion rearing water contaminated with lead or aluminum compounds. Abdelhamid, A.M., el-Ayouty, S.A. Archiv für Tierernährung. (1991) [Pubmed]
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