Chad Basin demand for ivory, but stocks have since recovered. The seasonal Korama River in the south of Niger does not reach Lake Chad. Nigeria includes two sub-basins that drain into Lake Chad. The Hadejia - Jama'are - Yobe sub-basin in the north contains the Hadejia and Jama'are rivers, which supply the Hadejia-Nguru wetlands. They converge to form the Yobe, which defines the border between Niger and Nigeria for , flowing into Lake Chad. About of water reaches Lake Chad annually. Construction of upstream dams and growth in irrigation have reduced water flow, and the floodplains are drying up. The Yedseram -
Fishing in Chad Cameroon, the surplus catch was dried, salted, or smoked before being sold. Between 1976 and 1985, production of dried, salted, or smoked fish was estimated at 20,000 tons annually, representing from 20 to 25 percent of Chad's total annual catch. A large share of the commerce in preserved fish was carried on with markets in Cameroon and Nigeria. Small dried or salted fish called salanga were most popular on the markets of Cameroon. Larger smoked fish called banda were generally exported to the major Nigerian market of Maiduguri. Through the mid-1980s, Chad had taken few steps to control or modernize