It is quite natural that human bowel actions in most cases smell bad. It is the normal state. Nevertheless, if one notices that their bowel smells spoiled and strong, it must be serious health problems. If the smell reminds you of fish, it can be a problem of cholera infection. This infection in the body, to be more specific, inside the intestine, causes this extremely smelling looseness. The reason is the smell of bacteria inside. In case of cholera, the second smell reason can be malabsorption.