Opsaridium microcephalum, known as "Sanjika" in Malawi, is a predatory minnow (feeding on the Usipa, Engraulicypris sardella) that attains 30 cm (12 inches) in total length. This mature male has lost some of its dorsal fin; notice the nuptial tubercles projecting from the lower jaw. The Sanjika was long known under the genus Barilius, but that genus is now used only for Asian species. Photo copyright © 1999 by M. K. Oliver.

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