Cetobacterium somerae

Cetobacterium somerae is a microaerotolerant, Gram-negative, and rod-shaped anaerobic bacteria found in the gastrointestinal tract of fish living in freshwater ecosystems. The bacteria is also immobile and non-spore forming. C. somerae was first isolated from the feces of children with Autism spectrum disorder. Members of bacteria within the Cetobacterium genus tend to dominate the microbiota of fish in freshwater ecosystems. Cetobacterium somerae also produces vitamin B-12 within the gastrointestinal tract of fish in order to provide nutritional support for growth.