Would cross breeding put the fish itself in danger? Or would it just have babies that won't survive? What would happen exactly?
This question is delving into a knowledge of biology beyond mine. But I do know that in many cases, cross-breeding results in offspring that are themselves infertile. I'm not saying it will here; I understand that the common Guppy
and Endlers Livebearer
do live together in at least one natural habitat, and ichthyologists are fairly certain they do not naturally inter-breed. But in aquaria when forced, they have, and some aquarists report supposedly fertile offspring, others say no.
Obviously, the two Platy
species and the Swordtail
will cross-breed with fertile offspring; we would not have the multitude of colour varieties today if this were not so.
As I mention in our Guppy
profile, some current ichthyologists are proposing that the Guppy
be moved to a distinct genus rather than being kept as a species in with the molly species (of which there is more than one). This would suggest these two fish (Guppy
, molly) are perhaps not as closely related as once thought.