0
The spiral egg case of a Port Jackson shark
OvoviviparityMost sharks are ovoviviparous, meaning that the eggs hatch in the oviduct within the mother's body and that the egg's yolk and fluids secreted by glands in the walls of the oviduct nourishes the embryos. The young continue to be nourished by the remnants of the yolk and the oviduct's fluids. As in viviparity, the young are born alive and fully functional. Lamniforme sharks practice oophagy, where the first embryos to hatch eat the remaining eggs. Grey nurse shark pups intrauterine cannibalistically take this a step further and consume other developing embryos. The survival strategy for ovoviviparous species is to brood the young to a comparatively large size before birth. The whale shark is now classified as ovoviviparous rather than oviparous, because extrauterine eggs are now thought to have been aborted. Most ovoviviparous sharks give birth in sheltered areas, including bays, river mouths and shallow reefs. They choose such areas for protection from predators (mainly other sharks) and the abundance of food. Dogfish have the longest known gestation period of any shark, at 18 to 24 months. Basking sharks and frilled sharks appear to have even longer gestation periods, but accurate data are lacking.[45]
OviparitySome species are oviparous like most other fish, laying their eggs in the water. In most oviparous shark species, an egg case with the consistency of leather protects the developing embryo(s). These cases may be corkscrewed into crevices for protection. Once empty, the egg case is known as the mermaid's purse, and can wash up on shore. Oviparous sharks include the horn shark, catshark, Port Jackson shark, and swellshark.[45][46]
ViviparityFinally some sharks maintain a placental link to the developing young, this method is called viviparity. This is more analogous to mammalian gestation than that of other fishes. The young are born alive and fully functional. Hammerheads, the requiem sharks (such as the bull and blue sharks), and smoothhounds are viviparous.[39][45]
What else can I help you with?
Do female sharks lay there eggs in the water?
Since sharks never leave the water, it is obvious that female sharks lay their eggs in the water just as all other fish do.
How many eggs will a shark lay at once?
Not all sharks lay eggs, you will need to specify the type of shark.
The largest eggs in the world are laid by a shark?
Most sharks do not lay eggs, but instead bear live young, with the shark fetuses supported by the mother in a manner similar to mammals. Some others have eggs, but the eggs remain inside the mother, with the young living off each other. Of the remainder, some simply lay them on the bottom of the ocean, while others place them in crevices. Some of the bottom-laid eggs have long streamers that grab onto nearby objects and hang on until the young are born.
Are the eggs of the newt fertilized internally or externally?
the answer to this question is internally for most newts, including all Western types.
Eggs first develop in a woman?
A woman's eggs are developed before their birth. A woman is actually born with all of the eggs she will ever have.
Do silver sharks have live babies or eggs?
Shark's reproduction depends very much on the species.Most sharks, like the great whites (Carcharodon carcharias), tiger sharks (Galeocerdo cuvier), nurse sharks (Ginglymostoma cirratum), among many other Carcharhinidae species, are ovoviviparous.The bull shark (Carcharhinus leucas), the crocodile shark (Pseudocarcharias kamoharai) and other mackerel sharks are viviparous.Last but not least, catsharks like the large-spotted dogfish (Scyliorhinus stellaris) are oviparous.
Example of fishes that lay eggs?
all fish lay eggs... except sharks and whales and stuff like that
What are some kinds of fish that do not lay eggs?
All fish lay eggs, however some fish retain these eggs inside them until they hatch (they are ovoviviparous). Hammerhead sharks do this and with seahorses the female transfers the eggs to the male for incubation.
What animals are born alive?
All mammals, except for echidnas and platypuses which lay eggs, give birth to live young. All sharks and rays give birth to live pups (or baby sharks and rays to most of you) as well. All other animal species lay eggs, however since the cells within these eggs are, in essence alive because they grow and multiply, it can be said that even eggs are born alive. So in short, all animals are born alive.
How many eggs does a mako shark have?
We really don't know. It's difficult to tell how many eggs in all were produced were because the pups (baby sharks) eat eggs-- and each other-- while inside her. Mako sharks aren't egg-layers; they do live birth. They start when they're about six feet long but they can grow up to around 12. A litter is generally 4-16. Larger sharks give birth to more pups.
How many babies do sharks have?
Sharks produce up to ten young ones. They hatch in the mothers womb and after the first baby has hatched they try to kill all the other unhatched babies and eat them. The strongest one that survives is born and the rest are all dead in the mother's womb.
Do fish develop internally or externally?
Fish develop externally, meaning that fertilization and embryonic development occur outside of the parent fish's body. The eggs are often released into the water where fertilization takes place, and the embryos develop independently until they hatch.
