Do fish always hatch from eggs, or are some live born?

Question

What about sharks? the eggs would be pretty big.

Answer 1

Many fish have live births-- Most of them you seen in aquariums are from the family Poeciliidae. It includes Guppies, species name Poecilia reticulata (note: they also eat their young...) some others are Platies, Swordtails, Silver Lyretail Molly and other Mollies. There are others from the family, but they are harder to breed.

Many sharks are also Viviparous... they usually have 2-24 pups at a time; however, some of them are egg-laying- just depends on the species.

Answer 2

some kinds of sharks keep the fertilized eggs inside the female, and when the batch hatch they are live born... look at the Discovery channel once a while...

And as a note: DOLPHINS are MAMMALS, not fish... AND there are mammals that lay eggs.

Answer 3

a shark isn't a mammal ...

They have a reproductive strategy known as viviparity. The eggs hatch inside the female's body and the babies are fed by a placenta which transfers nourishment from the mother to the babies (via an umbilical cord which is connected to the baby shark behind the between the pectoral fins). The placenta helps transfer nutrients and oxygen from the mother's bloodstream and transfers waste products from the baby to the mother for elimination. Viviparous sharks give birth to live young.

Answer 4

Some fish such as guppies ans mollies give birth to live fish. They carry eggs within their bodies where they hatch and then pass through the birth canal. Sharks lay large eggs that attach themselves to seaweed and other objects.

Answer 5

Many fish are born live, in fact at a guess I would say more than hatch from eggs

Answer 6

All fishes are oviparous,i.e they lay eggs and from the eggs hatch out their young ones. However, there is one kind of cartilage fish called as Scoliodon(dog fish) which retain the egg in its oviduct till it hatches out. Then it gives birth to young fish. however, this can not be compared with viviparity by mammals. Such a condition is also found in some vipers. This phenomenon is called ovo-viviparity.

Answer 7

there are some sharks (even the whale shark, the largest fish) who are egg bearers. But some sharks are born live as well (the bull shark for one)

Answer 8

All embryoes should be nourished prenatally, even if interior an eggshell or by potential of a placenta. The eggs of warm temperature-blooded ainmals (specifically birds) should be saved warmth, yet those of chilly-blooded animals can in basic terms be left the position they are laid. Any embryo that develops interior an egg ought to emerge even as the availability of food is fed on, yet a placenta helps the embryo to advance extra totally earlier delivery, because it (the placenta) factors a sluggish provide of food see you later because that's needed. purely mammals, and not in any respect even all of them, have placentas. (The platypus, which has a bill and lays eggs, is assessed as a mammal quite than a fowl because it has 4 legs and suckles its youthful.) Marsupials (e. g. kangaroos) undergo stay youthful yet haven't any placentas. The youthful advance in eggs contained in the mummy's uterus and are born even as that source of food is exhausted, yet they'e nevertheless little more effective than fetuses at that element--for this reason the will for the pouch. The newborns of placental mammals, from sloths on up, may be too helpless to proceed to exist on their personal, yet they are, actually, totally greater animals.

Answer 9

Fish births fall into both live births and egg birth, if the female is impregnated by the male she will give live births (called Fry) on the other hand if she lays her eggs, the male will impregnate the eggs later

Answer 10

some fish lay eggs and others a born live. dolphins are born live and salmons lay eggs. it all depends on the type of fish.