Only guppies breed with guppies naturally.
Fish which do not lay eggs, but give birth to live young, include:guppymollymosquito fishplatyswordtail
Not all sharks have live young. Some lay eggs like most fish do but to answer your question, no, sharks are not the only fish that give live birth. Guppies, mollies, swordtails and other members of the family Poeciliidae, as well as members of other fish families, give live birth.
I doubt that they can breed, a lot more depends on if two fish can breed than just their size, as far as I know guppies can only breed with other guppies.
No, there are other fish who have live young called guppies or something like that
Guppies are small, colorful fish that need to be fed twice to four times daily. They can only eat small amounts at a time. Guppies are tropical fish and need a heater set to about 27 - 25 degrees. Guppies give birth once a month, with a highest amount of fry at 70 depending on the the health and age/ size of the female. They are a freshwater and brackish water fish. Guppies need a ph level of 7 to 8. There needs to be a larger number of females than males, otherwise the males will fight over them. They will eat their own fry.
Only if there is one in a tank they get very fisty , they will bite other fish in your aquarum .
They could but it wouldn't be very suitable. Guppies, although small fish, produce millions of eggs, and being fresh water fish, they need to be layed in the river they inhabit. Only a handful of guppies will survive, so they need a rather big space to reproduce/
because it give birth to young alive Guppys are livebearers.
You can keep most tetras, some barbs(not the Tiger Barb it will shred your poor fish's fins). You can also keep a Beta fish with them but, be carful when you put one in with your Guppies because he might attack your Guppies. Hope this helps!
Fish did not give birth but only lay eggs
The only male fish that gives birth to young is the seahorse. He actually is not giving birth, but retains fertilized eggs in his body and releases them when the eggs hatch.