Young marine lampreys migrate from fresh water to the 9 8 7 6 5 4 3 2 1 ocean and then die.
There are three features that distinguish cartilaginous fishes.
A diverse clade of fishes, amphibs, reptiles, and mammals can be found in gnathos.
The living forms were more efficient than the fishes.
There were Jawed fishes in the mid-Ordovician jaw.
There are nine sarcopterygii (coelacanths and lungfishes) in the fishes and jawless fishes.
There are eight gill slits in this cartilaginous gill arches.
The first two pairs of gill arches were lost, sider the three classes of jawed fishes.
The third pair became modified to form a jaw.
The other jawed vertebrates will be explored in this left six gill chapter.
The fourth gill arch contributes to jaw support in modern jawed fishes.
The development of a hinged jaw was important in the evolution of gnathostomes.
It made it easier for an animal to grab its prey and allow it to attack larger prey.
Some of the gill arches were modified.
The first and second gill were the beginning of more sophisticated head and body structures, arches were lost, and the third and fourth pairs evolved to form the including two pairs of appendages called fins.
specu becomes modified to serve other functions.
The hinged jaw developed from the gill arches, cartilaginous dermi and Placo died out during a mass extinction.
The jaws and gill arches support the view that this extinction is not well understood.
The character was derived from Reptilia.
This means that you rise to the surface.
The shark was rolling in the water as the tail fin pushed it forward.
The bers of this class lost swimming after water entered the mouth and forced over the feature.
The hypothesis is that the gills allow sharks to breathe.
The skeleton of the ocean floor is used by skates and rays, which are flattened sharks.
Most of the 475 species of skates and fied are eaten by crustaceans and mollusks.
At times, they replace the softer cartilage with a matrix.
The nurse nous fishes are believed to prevent sharks by using a muscular pharynx and jaw muscles to pump water over the ossification process.
The earliest fishes to have teeth were sharks.
The chondrichthyans are made of enamel.
Human teeth break off easily if they are set into the jaw, which is denser than water.
The silvertip shark is one of the most powerful sharks in the ocean.
There are sharks with large fins.
There are rows of teeth in the mouth of a sand tiger shark.
A dogfish shark's egg pouch is entwined in vegetation to keep it stationary.
Unlike the cartilaginous fishes, all other gnathostomes have a skeleton that is part of the heart.
The single means "bony fish" and was originally proposed for just that group.
The sense organs in the nostrils of sharks and other fishes allow for a powerful sense of smell.
They can see well, but can't tell the difference between species and colors.
Most biologists are generated by moving objects.
The Actinopterygii can sense movements in the water.
The sharks have an extra sense that helps them find prey.
Both clades of fish have sensory organs that detect signals from other organisms.
The female's body is the same as the cartilaginous fishes, but the water is young.
Larger individuals are the oldest.
Some early fishes lived in shallow, oxygen-poor waters and had an average life span of more than 200 years.
The est animal, at 500 cm long, could rise to the water surface and gulp air.
This species is the longest-lived one.
The operculum covers the gills.
There are many different sizes and body shapes of ray-finned fishes.
Whole fish farms are completely stationary.
In early-diverging bony fishes, the gut and swim the harvest of species such as cod, anchovies, and salmon.
The term sarcopterygii means to rise and sink.
Evolutionary studies can remain motionless and use a "sit and wait" ambush style.
The fossils show that the fishes evolved into the arthropods.
Some fishes, known as bimodal breathers, can breathe through fishes, the fins are supported by skeletal extensions of the pectoral their gills and by gulping air, absorbing oxygen through their diges and pelvic areas that are moved by muscles within the fins.
Bony fishes have colonized nearly all aquatic habitats.
After intensive searches in the area, it was discovered that coelacanths were living in rated from the oceans and that they were added to the deep waters off the southern African coast.
The majority of the fish in the islands near the coast of Madagascar are called the Comoros Islands.
A new species was found in Indonesian waters.
The coelacanth lost lungs and returned to the ents compared with fresh water, which is why the development of Early-diverging lobe-finned fishes was necessary.
The coelacanth's unusual body fishes vary greatly, but most species reproduce via external fer plan, its swim bladder is filled with oil rather than gas, although it tilization, with the female shed her eggs and the male depositing serves a similar purpose.
Lungfishes live in freshwater fish nurseries.
They have lungs that allow them to come to the surface and gulp air.
If the fish can't breathe air, they will drown.
Lungfish have muscular fins that are supported by thin, bony, flexible rays and are often able to successfully traverse long distances over shallow water.