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).