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Osteichthyes and Chondrichthyes
Transcript of Osteichthyes and Chondrichthyes
The amount of food a bony fish eats is directly related to its temperature, size, and metabolism. smaller fish usually have a higher metabolism so they eat more than the larger ones. Some bony fish can go a long time without eating. for example freshwater eels can go a year without eating. they have either a U or V shaped stomach. they get their food by hunting, filter feeding, or bottom feeding, Digestion: Chondrichthyes
some sharks are filter feeders, They open their mouths as the water flows and food flows into their mouths. Other sharks swalloew their prey in one big gulp and some take bites and chew. All fish have a two chambered heart. Their hearts are simpler than ours with a one direction flow. Their circulatory system consista of a heart bloood vesssels and blood. their blood is about 2% of their body weight. the atrium recieves unoxygenated blood and pumps it to the ventricle. bony fish are exothermic. osteichthyes Have a 2 chambered heart with an atrium and ventricle. It is S shaped and located in the head. it is much simpler than the human heart. sharks are endothermic chondrichthyes nervous system fish eggs chondrichthyes reproduction Oseichthyes osteichthyes chondrichthyes Osteichthyes digestive Respiratory system Osteichthyes respiration is done through the gills. They are supported by the gill arch which holds the gills open. To increase the efficiency of the gill the blood flows in the opposite direction of the water inside. They also have a swim bladder which is a partially gas filled sac that evolved from the lungs. it is used to keep them virtually weightless in the water. A lungfish must go to the surface to get air. Some species of bony fish can absord oxygen through their skin. Chondrichthyes Have three different types of respiration
"two pump" method while at rest sharks pump water over their gills.
ram ventilation while sharks are moving water passes through the gills of sharks there are some sharks who aren't able to do the two pump method so they can never stop moving.
spircles assist the shark when taking in water. plays a major role in bottom dwelling sharks osteichthyes- the brain is divided into three sections: the forebrain, the midbrain, and the hindbrain.
Bony fishes that have an especially good sense of smell, such as eels, have an enlarged forebrain. Blind fish, such as cavefishes in the family Amblyopsidae, have a reduced midbrain.Fast-swimming bony fishes usually have an enlarged hindbrain.
A sharks nervous system consists of a simple brain a spinal column. usually produce few, large eggs. their offspring usually represents miniature adults. sharks are internally fertilized. most often the litter of sharks is no bigger than 100. most species are sexually mature by three years but for one specie can take up to 15 years. they may change to from females to males. Reproduction in fishes involves Courtship: behaviors designed to attract mates Spawning: release of gametes into the water Copulation: direct transfer of sperm into the female’s body.
depending on the type of embryotic development bony fish have internal or external fertilization. many are born hermaphrodites and can change their sex at any given time. for this reason they are able to reproduce unisexually, the offspring always is female. Shark nervous system Habitat and Niche CHONDRICHTHYES
Sharks are in equilibrium with the populations of their prey and thus play a role in maintaining a stable marine ecosystem. found in the ocean all over the world. OSTEICHTHYES
Bony fishes inhabit almost every body of water. They are found in tropical, temperate, and polar seas as well as virtually all fresh water environments. they are prey in their enviorment.