The fish is a species of freshwater sardine found only in Lake Kivu and Lake Tanganyika, small enough — about 6 centimeters — to eat whole, like whitebait.
Isambaza are small, silvery sardines native to Lake Kivu, battered lightly and deep-fried whole until crunchy enough to eat bones and all. Fishermen bring them in each morning around Rubavu and Kibuye, and lakeside kiosks pile them into bowls to share at sunset with a cold drink.