In the setting of study of the biodiversity of kivu Lake Basin Rivers, the first activity was done from January 2012 to December 2012 to inventoriate the diversity of fishes in Nyabarongo River.
The knowledge on the fishes kinds species population and the in the case that fishes contribute in the East of the DRC rivers is important pronounced with a high degree in the region, So our study is based on the distribution of fishes in Nyabarongo river.
To reach better results, we have taken specimens of fishes with nets and hooks according to the method of capture at random. The nets (traps) are placed in the river with the opening orientated down wards in direction of the river bed attached on the sticks. Earth worms or advocates, bananas, casava bread was put in /on the trap and was observed since nine o'clock till fourteen in the evening. At the end of the rope was attached a metallic bowl which leads the hook in the bottom of the river.
At all, 352 specimens of fishes were caught in different places of our study in which the Clarias specie dominated because it supports the Nyabarongo river pollution with an elevated percentage followed by the Barbus kerstenii with a mean percentage and the Oreochromis niloticus specie (kind) with a feeble percentage.

Numerous kinds of animals are domesticated in the world for fruman feeding.The domestication methods has also changed to satisfy the meat request. The Traditionnal domestication alwaysexists but the big or important part is industrial.At Katana, the pig domestication has helped the population to promate the economy and fight against the poorness.Thin population in occupied try pig domestication because they have noticed that animal brings a lot of benefet which can help to make face to different problems of social order.So,if we want to know the causes at consequences of diminution or regression of pigs domestication in this region,in this part of the South Kivu,an identificationof differents difficultives is necessary and helps to lead the new technics which can push the population in that activity(domain).

In this present study an evaluation of a daily variability of suspended sediment flux of the river Cirhanyobwa, one of the important tributary of Lake Kivu, is reported. A daily sampling was done during one year. Suspended sediment and discharge was measured using standards method and floating method respectively. The results shown that agricultural has a impact on the transport of suspended sediment in this river. The quantity of suspended sediment in the river Cirhanyobwa was high during the beginning of the first tillage in July-August and February. Daily Suspended sediment and flux increased with daily flow. Ecological techniques are useful to prevent the suspended sediment transport in the river bed. These techniques consist of agricultural practices and conservation of river bank.

This study was conduct at the Centre de Recherche en Sciences Naturelles de Lwiro to evaluate the anthelmitic activity of aqueous and ethanolic extracts of Viscum congolensis and Galiniera coffeoides, two plants collected in Kahuzi-Biega National Park. The objective was to assess their activity against earthworms Alma emini. The aqueous extracts are efficacy than ethanolic extracts. Their concentrations varied between 2 and 0.2 mg/mL. These results were compared to positives control (Mebendazole, Albendazole and Decaris) and negative one (water). The detailed are necessary for the isolation, characterization and evaluation of the substances responsible of anthelmitic activity and the action mode of the substance identified.

Malacological and epidemiological investigations have been done in Katana Health Zone during the period from 2001 to 2011. The results shown that the schistosomiasis exists and constitutes a problem of health in this region. A total of 189,475 stools examinations and 11,000 of urines done during the ten years passed; 1,904 cases of schistosomiasis due to Schistosoma mansoni have been observed. That is a rate prevalence of 0. 95 % and 39 cases of Schistosoma haematobium have been recorded. That is a rate prevalence of 0.35 %. Methodical treatment per os of infested subjects by Ambilhar and the control of intermediate host by molluscicidal no toxic to human and environment are measures to take immediately.

A malacological fauna survey was done in the Katana region in South Kivu, Democratic Republic of Congo were intestinal schistosomiasis (Schistosoma mansoni) was signaled. Sampling was done in 23 Streams using the technique of Olivier and Scheirderman (1956). About 14 species was collected: Biomphalaria pfeifferi (Krauss, 1948), Lymnaea natalensis (Krauss, 1948), B. forskalii (Ehrenberg, 1931), B. globosus (Morelet, 1866), P. ovata (Olivier, 1804), Tomichia kivuensis (Mandahl-Barth, 1974), Tomichia hendrickxi (Verdcourt, 1950), Lentorbis junodi (Connolly, 1922), Segmentorbis kempi (Preston, 1912), Potadoma ignobilis (Thiele, 1911), Potadoma freethii (Thiele, 1911), Ferrissia burnupi (Walker, 1912), Pisidium casernatum (Poli, 1791) and Physa acuta (Brackenbury et Appleton, 1991; Draparnaud, 1805), in which 5 species (Biomphalaria pfeifferi, Bulinus forskalii, Bulinus globosus, Physa acuta and Ferrissia burnupi) are recognized as intermediate effective or potential host of schistosomiasis (Schistosoma manasoni and Schistosoma haematobium). The ecological characteristic of the species in the Katana region are present in this work.

Schistosoma mansoni, the blood fluke responsible for human intestinal schistosomiasis exists in Katana region and it's hosted by the snail Biomphalaria Pfeifferi. But Schistosoma haematobium responsible of urinary schistosomiasis has not been reported in that area. The appearance of its intermediate host Physa acuta in the region attracts our attention about future infestation. The objective of this study is to determine the distribution area of this species which appears in region. The snail collection was done in 25 sites comprising 14 streams and rivers, 3 groups of ponds, 7 springs and Lake Kivu.These sites are grouped in terms of altitude gradient and the frequency of people and domestic animals. The results show that altitude has an effect on the distribution of Physa acuta in the region. The snail was collected in streams and ponds compared to sites located at the Lake and in rivers. They were found in the site where the ecological conditions were favorable (water velocity, aquatic vegetation and also water quality). The absence of snails in some elevations is related to the ecological factors which reduce the survival of Physa acuta. The risk of local transmission of urinal schistosomiasis in Katana is predictable as its potential intermediate host Physa acuta is now present and largely distributed in the region.