All cartilaginous fish have internal fertilization. Some species are oviparous, or egg-layers, and some are ovoviviparous, hatching the eggs within the female and giving birth to live young.
How do cartilaginous fish reproduce?
Reproduction in cartilaginous fishes is complex, and starts with courtship and copulation. The claspers are filled with sperm from the urogenital papilla of the male and inject the seminal fluid into the female. … Cartilaginous fishes typically produce few, large, yolky eggs and have a low rate of reproduction.
How do cartilaginous fish defend themselves?
The mouth, nostrils and gill slits of skates and rays are always found on the underside of the fish, with the eyes and spiracles on the upper side. Many species also have spines and thorns on the upper surface and tail. … Rays defend themselves using the stinging barb on their tail as a weapon against predators.
Do chondrichthyes lay eggs?
Sharks and rays are fishes with skeletons made of cartilage, grouped together in the class Chondrichthyes. Their egg cases are sometimes referred to as mermaid’s purses, and occasionally as Devil’s purses. The egg is a capsule that contains a developing animal and a yolk sac which the young gets its nutrition from.
Do cartilaginous fish have teeth?
Cartilaginous fish such as sharks, skates, and rays are vertebrates whose internal skeleton is made entirely of cartilage and contains no ossified bone. … The skin of rays is naked in places, that is, without dermal teeth, but on the back of or upper tail surface, the dermal teeth have developed large, strong spines.
How long do cartilaginous fish live?
How Long Do Cartilaginous Fish Live? Some cartilaginous fish may live for up to 50-100 years.
Why are sharks cartilaginous fish?
Sharks, rays, skates, and chimaeras (also know as rat fishes) all have cartilaginous skeletons. Cartilage is less dense than bone, allowing sharks to move quickly through the water without using too much energy.
Which is the cartilaginous fish?
Cartilaginous fishes (chondrichthyes) represent the oldest surviving jawed vertebrates and, as the name suggests, have a skeleton made out of cartilage. They include sharks, rays, and skates (elasmobranchii) and chimeras (holocephali).
Is a puffer fish a cartilaginous fish?
Bony fish dominate the oceans. They differ from cartilaginous fish because they have bone skeletons and a swim bladder that helps them float.
What do all chondrichthyes have in common?
Members of Chondrichthyes all lack true bone and have a skeleton made of cartilage (the flexible material you can feel in your nose and ears). Only their teeth, and sometimes their vertebrae, are calcified; this calcified cartilage has a different structure from that of true bone.
Do sharks give birth through their mouth?
After the brief courtship and one-night stand with the male, the female shark is left to carry the fertilized eggs in her oviduct, or womb. Port Jackson sharks do the same thing, carrying the egg cases in their mouth until they find a safe spot. …
Is a shark a fish or a mammal?
Sharks are fish. They live in water, and use their gills to filter oxygen from the water. Sharks are a special type of fish known because their body is made out of cartilage instead of bones like other fish.
What makes chondrichthyes unique?
Species in this class have paired fins, hard scales, a two-chambered heart, and a pair of nostrils. Most species have 5-7 gill slits on each side of their body. Some species produce egg cases, others give birth to live young.
Which is not cartilaginous fish?
Dog fish is the only animal which belongs to superclass Pisces. Dog fish is a cartilaginous fish. Elasmobranchii (dog fish) is an alternative name for cartilaginous fish or Chondrichthyes. The name refers to the fact that the gill-slits are exposed and not covered by an operculum.
Do chondrichthyes have bones?
Members of the Chondrichthyes all lack true bone and have a skeleton made of cartilage (the flexible material you can feel in your nose and ears). Only their teeth, and sometimes their vertebrae, are calcified; this calcified cartilage has a different structure from that of true bone.
What is in the class chondrichthyes & What traits do they have in common?
What organisms are in class Chondrichthyes? What characteristics do they have in common? *Sharks, rays, and close relatives. *Jawed fish lack swim bladder and have cartilaginous skeletons.