sepsis is more fish among males than females
 research to date there is evidence that the genetic basis for aggression in betta fish is not exclusively sexlinked  a recent study found that female bettas of the fighting strain show significantly higher levels of aggression than their female wildtype counterparts despite the fact that historically only male bettas have been used in fights and thus artificially selected for aggression
 in regards to oxygen consumption one study found that when two male bettas fought the metabolic rates of both fish did not differ before or during the fight