betta pugnax

Webster's Dictionary (GCIDE)

1.Qualified for war; fit for battle. [1913 Webster]

An host of fighting men.— 2 Chron. xxvi. 11.[1913 Webster]

2.Occupied in war; being the scene of a battle; as, a fighting field. --Pope. [1913 Webster]

A fighting chance, one dependent upon the issue of a struggle. [Colloq.]

Fighting crab (Zool.), the fiddler crab.

Fighting fish (Zool.), a remarkably pugnacious East Indian fish (Betta pugnax), reared by the Siamese for spectacular fish fights. [1913 Webster]