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.
Are cartilaginous fish usually predators?
Chondrichthyes A class of vertebrates comprising the fishes with cartilaginous skeletons. The majority belong to the subclass Elasmobranchii (skates, rays, and sharks – see Selachii). Most cartilaginous fishes are marine carnivores with powerful jaws.
What are some unique traits of cartilaginous fish?
They generally possess the following characteristics:
- Their endoskeleton is primarily made of cartilage.
- Their exoskeleton is made of placoid (very small denticles coated with lots of sharp enamel)
- The buccal cavity of these fishes is ventrally positioned.
- The position of their tail finds is heterocercal.
What adaptations do cartilaginous fish have?
The Adaptations of a Cartilaginous Fish are:
- These fish have jaws which have tiny teeth with the upper row of teeth having a layer of enamel and the lower row of teeth is made up of bone tissue.
- The shark’s dorsal fin is used to steer while swimming.
Why are cartilaginous fish important?
Cartilaginous fishes have to be viewed as an integral part of any ecosystem since in most instances they are among the top predators. Even among cartilaginous fishes there exists a hierarchy with some species being prey to others.
What are 3 examples of cartilaginous fish?
Cartilaginous fish include sharks, rays, skates and chimaeras.
Which fish has cartilaginous skin?
The cartilaginous fish are jawed fish with paired fins, paired nostrils, scales, two-chambered hearts, and skeletons made of cartilage rather than bone. Examples of the cartilaginous fish include sharks, rays, and skates.
What can you infer about cartilaginous fish from their name?
Cartilaginous fish are fish that have a skeleton made of cartilage, rather than bone. All sharks, skates, and rays (e.g., the southern stingray) are cartilaginous fish.
What are lampreys lacking that most fish have?
Unlike “bony” fishes like trout, cod, and herring, lampreys lack scales, fins, and gill covers. Like sharks, their skeletons are made of cartilage.
Which group is not cartilaginous fish?
The operculum is a bony flap covering the gills in bony fishes. It regulates the direction of water flow over the gills. It is not found in cartilage fishes. Whereas scales, gill slits and pelvic fins are found in both the fishes, bony and cartilaginous.
How digestive system works in cartilaginous fishes?
Fish ingest food through the mouth and break it down in the esophagus. In the stomach, food is further digested and, in many fish, processed in finger-shaped pouches called pyloric caeca, which secrete digestive enzymes and absorb nutrients.
Do fishes have bone marrow?
Bony fish (Class Osteichthyes) have bone marrow that they use to make blood. The skeleton of a bony fish gives structure, provides protection, assists in leverage, and is a site of red blood cell production.
What is the difference between bony fish and cartilaginous fish?
Endoskeleton is made up of bone. Endoskeleton is made up of cartilage. They have 4 pairs of gills.
Difference Between Bony Fish and Cartilaginous Fish.
|Bony Fish||Cartilaginous Fish|
|Exoskeleton is made up of cycloid scales.||Exoskeleton is made up of Placoid scale.|