Our study was about access on drinking water in the urban rural population of Bumba. It was about getting ways how the population of this city could organize themselves to provide drinking water for themselves, which they need for their life. In fact, in a particular way, an emphasis was put on the quality of the water that they use and its repercussion on the public health. Water, considered inaccessible and of bad quality according to the investigations, is responsible for hydric diseases. Its inaccessibility, to the population, is specially due to deterioration of the installations, to the dysfunction and long distance to the water providing wells. Water quality problems in Bumba is explained by the lack of treatment of consumption water by the majority of its population, impotence of the public powers, the e lack of voluntarism as far as improvement of population life conditions is concern, lack of mobilization and programs integration "water and health". Bad practices in Hygiene and cleaning makes populations vulnerable, mostly infants who are the most exposed to all hydric diseases (dermatosis, gales, diarrhea, intestine infections, parasitosis, etc.) "Drinking water for all" question has become, since some years, the target of many international conferences and preoccupies the whole humanity. Generally, these results reveals to us that, not only drinking water accessibility and its basic cleaning are difficult in Bumba, but also the population behavior.

Drinking water treatment and waste management have alarming dimensions in rural DR Congo, particularly in the Bengamisa region, and are currently experiencing continuous and permanent degradation. Also, there is a disparity between cities and within cities and this is expressed in terms of quality and quantity of drinking water between well-equipped areas (regular areas) and poorly equipped areas (irregular areas). However, water scarcity is characterized here by the abundance of dirty water whose use is a hindrance to the economic and social emergence of the population. The criteria for water scarcity in the Bengamisa region are lack of or poor access to drinking water, the preponderance of water-related diseases and above all the "doubt" that consumers have about the quality of water. of this resource. In general, the objective of this study is to evaluate the impact of plastic bottles in the treatment of drinking water by solar radiation, but also on human health. To achieve the objectives, we treated the drinking water by SODIS method, which consists in exposing under water the water contained in the PET plastic bottle for its purification. Thus, the following physicochemical parameters were the subject of our analyzes: pH, M.O, color, turbidity, nitrate, nitrite, total iron and temperature; and this before and after photo-purification of water. Indeed, it is clear from our investigations that the photo-purification of water does not change the physicochemical parameters of the drinking water so much. Similarly, it should be noted that not all plastics are innocuous and we must be wary of buying not only bottled water but also other products / foods packaged with plastic. But, it is rather important to know what kind of plastic you have to do; and that all codes, in general, are mentioned on the bottom of bottles, containers, corks, etc. To do this, the plastic bottle based on polyethylene terephtalate (PET) is more recommended than the others, because of its performance in solar recipe. It should also be remembered that consuming bottled water harms the wallet, the environment, and "could" harm health.

Food and feeding habits of Hippopotamyrus psittacus (Boulenger, 1897; Pisces: Mormyridae) of Congo river has been undertaken from February to July 2007 by the stomach contents analysis. 44 H. psittacus ranging from 55 to 320 mm of length were captured in the Congo River (Wagenia Falls and Kikongo beach). The total length, the standard length and height of the body were measured with a ribbon meter and weighed using both bood scales of 0- 3000gr. Afterward, stomach contents were taken and conserved in the Laboratory for future analysis. Stomachs contents were examined using a binocular magnifying glass LEICA WILDHEERBRUGG Mg model with a magnification of 10 to x50. The stomachs contents analysis showed that H. psittacus is a carnivorous with an insectivorous tendency by feeding mainly on aquatic insects and other animals remnants. On the other side, the food regime of H. psittacus appeared more diversified during the relatively dry season periods. On the same way, the average stomach contents weight indicates that the feeding activity is more or less different during different season periods with an increasing feeding activity during the relatively dry season periods.

A study was conducted on the food ecology of Ichtyoborus besse congolensis of Biaro River and its Yoko tributary in the Yoko Forest Reserve, Democratic Republic of the Congo. It took place over a period of one year: from September 2008 to August 2009. The size and weight of 98 specimens of Ichtyoborus besse congolensis Giltay, 1930 sampled varies from 3.6 to 31.5 cm, with an average of 21.5 cm for the first parameter and of 14-364.4 g, that is, an average of 77.4 g for the second measurement. The analysis of 68 full stomachs of Ichtyoborus besse congolensis Giltay, 1930 under a dissecting microscope shows the dominance of animal origin preys with more or less 6 taxa against some traces of plant fragments. The composition of the diet according to seasonal periods, showed that during relatively dry seasonal period, males appeared to be fish (OCC = 9.6), Heteroptera (OCC = 3.2), Ephemeroptera (OCC = 3.2) and plant fragment eaters (OCC = 3.2), while the trace of molluscs is observed only in females (OCC = 33.3). Shrimps, fins and scales were found in both sexes, but in different proportions, because the large proportion of shrimps was observed in males (OCC = 83.9) while those of fins and scales were dominant in females. More, the emptiness rate was significant only in males. On the other hand, during the rainy season period, females become more opportunist in fish (OCC = 50), shrimps (OCC = 100), fins (OCC = 25) and scales (OCC = 50) than males with respectively 16.6 %, 76.6%, 6.6% and 36.6% of occurrence, and the rate of emptiness is higher in females. The food index (FI) and index of relative importance (IRI) of the main categories of preys; preys with high percentages are respectively fish (44%), shrimps (29%), animals fragments (26%). All the other categories of associated preys represent only 1%. It is the rainy period which offers many favorable opportunities for a good growth of fish species.