

Fig. 239. Red Hybrids (Life size) 



One of the most remarkable productions in hybridization. On opposite page, num- 

 ber 3 is a small, deep-red fish. Number 1 is greenish with some red markings. This cross 

 produces some reddish hybrids, blotched black. When the reddest of these females is 

 bred to number 7, we get a magnificent, large red fish. It grows rapidly and becomes 

 considerably larger than any of its progenitors. These hybrids bred together throw a 

 surprisingly high percentage of reds — well over half. In a few generations of selective 

 breeding we should have a very fine strain of these beautiful fishes. Hybrids in fishes 

 seem to be moderately fertile. 



The female (upper figure) was "ripe" when the photograph was made, shown by 

 distended outline and by the dark spot near the vent, which is not so plain as in some 

 of the more translucent fishes. 



The possibilities of hybridization among live-bearing fishes are not fully known, but 

 the subject is receiving careful study. To be sure of known crosses it is best to place the 

 two fishes together before sexual characteristics have developed. If the sexes do not turn 

 out right, one still has virgin fishes to cross with those from other experimental aquaria. 

 A female once impregnated is fertile for four lots of young. Additional breeding habits 

 page 242 (No. 18). 



257 



