While it is common for pet betta fish to lose fins, according to the experts, it is not normal. Either fin rot (which is caused by an infection) or fin loss (caused by external factors ...

Unfortunately, some fish can develop low immune systems in response to stress, and the bacteria can cause fin rot, an infection that can cause frayed fins, problems swimming, and eventual death if ...

"One to two percent of the fish had these huge lesions on them and fin rot," Frady explained to CBS News. "We've never seen that before." Researchers at the University of Florida are trying to ...