Same Experimental Dates About The Levels of Chlorinated Pesticides and PCBs in the Biota of Ohrid Lake D. Topi , P. Troja, K. Koci, E. Marku, A. Nuro University of Tirana, Faculty of Natural Sciences, Department of Chemistry, Section of Organic Chemistry Abstract This research paper contains some experimental data about the levels of Chlorinated Pesticides and PCBs in the biota of Ohrid Lake. These contaminant compounds are known as persistent organic pollutants (POP-s). Their highly lyophilize properties coupled with human factor, atmospheric depositions and food chain makes the biota a representative of pollution levels in the Lake. Interesting facts are exposed for the presence of these pollutants in endemic species of biota that live in this large basin, which has unique values for tourism in the region. In this publication we will show that levels are considerable. They are compared with levels of POP-s in the biota of other lakes of the region. We come to the conclusion that the origin of this POP-s is both anthropogenic and atmospheric. Levels of pollution in Ohrid Lake are compared with other regional lakes’ levels. We suggest that the levels of contaminant organic pollutants should be kept under control. Keywords: PCB-s, OCP-s, Biota analyses, the Ohrid Lake Introduction The Ohrid Lake is one of the oldest lakes in the world. The basin of the Ohrid Lake together with the lake belong to the geo-tectonic zone of the South-Eastern holes of Albania. The Ohrid Lake is part of the so- called Desaret Lakes. The flora and fauna of the Ohrid Lake is unique in the Balkans and wider. The lake’s biota is constrained by several abiotic factors, among which the geographic location, the water basin (fig. 1) and the temperature play an important role. The low temperature lake’s water makes the biologic processes be developed slowly, while the plankton (the phytoplankton and zooplankton) are special and interesting [1]. The number of the endemic kinds is high and makes up about 60% of the organisms that live in the lake [10] . About 60% of the fishes in the lake are endemic, 90% of the mollusks are gastropods, 70% of the crustaces are isopods, 80% of the annelid worms are oligocets and 72% of the flat worms are turbelars. The vertebral fauna of the lake, particularly the various kinds of fishes such as Salmo letnica, Salmo truta, Salmothynus ohridanus, Cyprinus carpio, Leuciscus cephalus albus, Alburnus alburnus alborella, Rutilus rubillio ohridanus, Cobitis taenia ohridana, Anguilla anguilla, etc, are very diverse [2, 3]. The bioaccumulation process of the organochlorinated pollutants into the Fig. 1. The water basin of the Ohrid Lake distribution lake’s biota clarifies the fact that this eco-system is affected by their. Their origin is as human as atmospheric. Stemming from these consideration, in this work we shall introduce some results that have to