fish family - any of various families of fish

Cypriniformes, order Cypriniformes - an order of animals including almost entirely freshwater fishes: characins; loaches; carp; suckers; sometimes classified as a suborder of Ostariophysi

cyprinodont - any member of the family Cyprinodontidae

Fundulus, genus Fundulus - killifish

genus Rivulus - killifish

genus Jordanella, Jordanella - flagfishes

genus Xyphophorus, Xyphophorus - swordtails

genus Lebistes, Lebistes - guppies