07-22-2012, 02:59 PM
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Originally Posted by sidluckman
Most modern varieties of platy and sword are the result of hybridization, and I would doubt there are many "pure" strains (i.e fish that, genetically speaking, are 100% swordtail or platy). Crossbreeding is therefore a real possibility and if you want to maintain the integrity of any strain you keep, you must keep it isolated from all other strains of sword or platy.
Often, whenever a new color or pattern emerged in one species, breeders would transfer that novel gene into the other. For example, I don't recall seeing mickey mouse swords years ago, but they are everywhere now, and i suspect the "mickey mouse" gene was bred into swordtail lines via platies. Probably the neon sword is already the product of of a platy/sword cross. Swords used to be much larger fish than they are today, and I believe some of the reason they are now smaller is a result of platy genes.
Interesting stuff. The two swordtail females appear pretty pure when compared to default generic images of neon swordtails. The two males (platy and variatus hi-fin) have left them alone so far minus one instance.