Mycobacteriosis in mangrove killifish (Rivulus magdalenae) caused by living fish food (Tubifex tubifex) infected with Mycobacterium marinum.

Mycobacterium marinum was demonstrated in the mud tube worm Tubifex tubifex. These worms served as live fish food for aquarium fishes. The ingestion of Tubifex tubifex by the mangrove killifish Rivulus magdalenae, a neotropical species in the order Cyprinodontiformes, was the source of an atypical mycobacteriosis of these fishes.