Since its accession to the independence, the Democratic Republic of Congo knew a succession of the disorders and wars with negative impacts on its economic tissue, its social and cultural development. The succession of wars which the R.D. Congo especially in its East part knew maintained a climate of insecurity in the National Park of Kahuzi-Biega and its periphery, more precisely in Health area of Cibumbiro in the health Zone of Miti-Murhesa and much more in its littoral part with the National Park of Kahuzi-Biega. The war of Rwanda and the massive arrival of the Rwandan refugees in RDC involved wars known as of "release", the creation of the militia and groups armed and conflicts between the ethnos Congolese Groups. This conflict generated many cases of plundering, rapes and massacres, which generated the disappearance of domestic fauna. Plundering themselves make lose 49 % of the domestic cattle and the fear of future plundering made the disappearance of its 51% ; such are the principal causes of the disappearance of domestic fauna in the health area of Cibumbiro.

A survey on the inventory of woody flora on the west coast of Lake Kivu has been done precisely in Katana region. Transect and quadrat methods have been used in the sites and many species inventoried of the vegetation have been recognized relics as: Brideliia bridelifolia, Vernonia amygdalina,Ficus lutea, Albizia grandibracteata, Tabernaemontana jonhstoni, Urera sp, Markhamia lutea, Erythrina abyssinica, Ficus vallis-choudae, Maessa lanceolata showing that there was primary forest in the region but was destroyed by anthropogenic activities.

A research has been made in Katana area in order to know the causes of woody flora disappearance in the occidental part of Kivu Lake in the Democratic Republic of Congo. Investigation method and free observations helped us on the ground. The obtained results confirmed that the woody flora have been damaged by human activities. 100% of population from the area has agreed the flora damage. Agriculture takes the first place as the cause of woody flora disappearance about 36% followed by the research of the live embers and firewood which takes 20%, building is concerned about 17%; sawmill about 15% and the brickworks take 12%.

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.