👉 Nannomonas is a type of bacteria commonly found in the gut of certain species of fish, particularly when they are exposed to high levels of light and chemicals. These bacteria can cause inflammation and damage to the lining of the digestive tract, leading to symptoms such as diarrhea, vomiting, and abdominal pain. Nannomonas can also be harmful to humans if ingested, as it contains a protein called nannobacterin that can trigger an immune response in some individuals.