Rufiji River
The Ulanga River is home to 23 species of fish that are caught on a regular basis including three species of fish not found downstream in the Rufiji: "Alestes stuhlmannii" and two species of "Citharinus congicus". Fish from the Rufiji River system migrate upstream to the Ulanga to spawn, usually at the beginning of the rains in November with peak spawning activity coming in December period.