hlk 



EXPERIMENTAL FISH EMBRYOLOGY 



-4i.--. 



X 



Xiphophorua hdlcrii mother 



■-^f 



Platypoecilus futhrr 

 Gold platjr 



Red-finned platy-helleri hybrid 



W^-"''^ X 



Xii'hoplinnii h^llerii mother 



Xiphopliorus hcllerii mother 



X 



Platypoecilufl father 

 Red platy 



^. 



Platypoecilus father 

 Black platy 



Black platy-helleri hybrid 



Xiphophonia hellerii mother 



X 



Plalypofrilu!! falhrr 

 Stippled and Spotted platy 



Mottled platy-helleri hybrid 



The platyflslies and the Mexican swordtail will readily hybridize. Tlie hybrids are 

 classified according to tlie original varieties of tlie species used in the cross. The 

 gold platy and the swordtail produce the red finned platy-helleri )iybrid. The red platy 

 and the swordtail produce the red platy-helleri hybrid. The black platy and the sword- 

 tail produce tlie black platy-liel leri liybrid. The stippled and spotted platy and the 

 swordtail produce ',he mottled platy-helleri hybrid. These liybrids frequently develop the 

 neoplastic disease known as nelanosis. 



