A STUDY OF THE BIOLOGICAL CHANGES OF OREOCHROMIS NILOTIC USE TO LEAD TOXICITY APPLICATIONS

Abstract

Since the beginning of the century, urban, industrial and agricultural development has caused a deterioration of water quality in the majority ofthe world. However, in recent years, there has b_een an increasing awareness that the aquatic pollution and other anthropogenic impact on water resources may have the potential to damage natural fish stocks. Consequently, the effect of various contaminants on fish populations has become an area of active research. This includes the impact of contaminants and water quality on survival of fish larvae in the natural habitat (Lenwood eta!., 1985); the effect of heavy metals on fish health (Pelgrom, eta!,

1995); the effect of organic contaminants on fish reproduction (Hansen et a!., 1985); the impact of halogenated organic substances on ovarian development of fish (Holm, eta!., 1994); the impact of domestic sewage on fish organs (Narain, 1990 and Bucher and Hofer, 1993); the effect of petroleum pollutants to fish and benthic organisms (Panigrahi and Konar, 1989 and Saha and Konar, 1990) and the impact of different pesticides on fish biology (Newsome and Andrews, 1993 and Khallaf eta/., 1994 ).

The histological effects of pesticides and related chemicals in livers offishes was studied by (Couch, 1975)