Cartilaginous fish or bony fish

Modern biology has gradually moved away from the idea of higher and lower.

Evolutionary degradation has likewise been downplayed.

Because there is no fixed evolutionary direction of organisms, for an environment, there must be one or more structures that adapt to the environment, and when the environment changes, the common structure will become cumbersome, and the original cumbersome structure may become an adaptation weapon, when the environment changes back, those species that are produced later are not the same as cumbersome, and the surviving species that appeared first have become the adaptation champion again, even if there is no species alive in the last round, when the environment changes back, there will still be a similar strategy of the structure re-emerges, Adapting some species to new environments.

For example, biological evolution is like a drop of ink on parchment, which will spread in all directions, and the environment is like a wax drop on parchment, which will hinder the diffusion of ink in certain directions, but if we remove the wax droplets, the ink will quickly replenish from the surroundings and fill the space for removing the wax droplets. You will also see that the ink is spreading from all sides towards the center of the wax droplet, in a completely different direction than the original, but under the same principle.

That is to say, there is no distinction between higher and lower levels of the positions on the parchment (analogous species), and the order in which they appear (analogous diffusion) is whether their adjacent positions have been diffused (analogous to ink-soaked parchment) and whether they themselves have been dripped into wax (analogous species adaptation to the environment), as long as both conditions are met, the species will definitely appear, regardless of whether there are other species that are "higher" or "lower" than it.

Going back to the original question, although most of the cartilaginous fishes are extinct, there are still sharks that are the top predators in the sea, and it is not inferior to the bony fish that it preys on because they are cartilaginous fishes, right?

It should be bony fish premium!

Difference Between Cartilaginous and Bony Fish:

1. The formation of DU in bones is different.

The frame of the cartilaginous fish zhi is made up of soft dao

Bone composition, although the spine has some ossoneization, lacks real bones. Part or all of the bones of bony fish are ossified into bony hyperplasia.

2. The period of appearance is different.

Cartilaginous fishes are relatively tall small animals in the deep sea, which first appeared in the Devonian period, and has been steadily developing to the present day. Bony fishIn the middle and late Devonian, some more developed bony fishes appeared.

3. Different types.

Cartilaginous fish also do not have fat, so they can only keep their bodies floating by constantly oscillating to ensure that CO2 is ingested from the colorful sea surface, and if the oscillation is stopped, it will sink to the bottom of the sea, and the oxygen content of the deep sea is low, and it cannot survive. The great white sharks, rays, rays, and silver sharks that we can see in the aquarium are all classified as cartilaginous fish.

The surface of the skull of the bony fish is made up of a large number of bone fragments butted together to form an intricate set of diagrams, covering the apex and sides of the head, and covering the gills backwards. The gill arch consists of a series of bone chains connected by bone nodes; The entire gills are covered by a single piece of bone, the operculum.

The main characteristic of the cartilaginous fish line is that there is no hard bone for life.

zhi；The body is covered with shield scales, dao

or scaleless; no swim bladder gyback; The vast majority are seaborn. A: The main characteristics of the bony fish line are the bones that are composed of at least part of the true bone (as opposed to cartilage), and other characteristics include: swim bladders (buoyant air sacs) in most species, gill compartments covered with gill covers, bony plate-like scales, skull seams and in vitro fertilization.

The bones of cartilaginous fish are soft and edible. As.

Sharks, rays, and silver sharks.

The bones of bony fish are hard and cannot be eaten.

Such as crucian carp, grass carp, yellow croaker, catfish, dolls.

Fish, eel, Chinese sturgeon, pomfret, hairtail, king eight [soft-shelled turtle], etc.

The main difference between cartilaginous fish and bony fish is their composition.

The bones are different. The bone of cartilaginous fish is composed of cartilage genus, such as sharks, rays, stingrays and silver sharks, and bony fish are more or less composed of hard bones, and most of the bones we see are bony fish, such as four big fish, catfish, yellow catfish, salmon and so on. Oh, if you go to eat cartilaginous fish, you can eat it all over your body, and you don't spit out bones!!

The skeleton of the cartilaginous fish is composed of cartilage, and although the vertebrae are partially ossified, the dao lacks true bones. They are relatively tolerant animals in the ocean, which first appeared in the Devonian period and have been steadily developing until modern times. The sharks, rays, stingrays, and silver sharks that we can see in the aquarium are all cartilaginous fish.

Cartilaginous fish do not have swim bladders, so they can only swim constantly to keep their bodies floating, ensuring that they take in oxygen from oxygen-rich seawater, and if they stop swimming, they will sink to the bottom of the sea, which has low oxygen content and is difficult to survive.

Sharks are a type of cartilaginous fish.

Bony fish is a highly developed vertebrate animal in the water, which is very widely distributed, whether it is in the ocean, rivers, lakes, caves, and even hot springs, it can be found in the body, and it is the most common fish. Bony fish is also the most successful fish of all the fish that live in the water, and there are more than 20,000 species of bony fish out of a total of 50,000 modern vertebrates. The grass carp, crucian carp, carp, etc., which we usually eat, are all bony fish.

The main characteristic of bony fish is the high ossification of the bones (scleroforming into bones), and even the scales are ossified. In addition, most bony fish have a swim bladder, which can be used to control the rise and fall of the body in the water through the contraction of the swim bladder, and in an oxygen-deficient environment, the swim bladder can also assist breathing.

Bony fish are common in life.

The above content refers to Milley's children's book "A Brief History of Life".

Cartilaginous fishes are generally divided into plate-gill and holocephalic groups. Plate-gill species have tabular gills, gill slits on both sides of the head, and no gill covers, including extinct slitchy sharks, lateral spiny sharks, and living mermaids and rays. Bony fishes diverge into two major branches that follow different evolutionary paths:

Radial-finned fishes (subclass) and flesh-finned fishes (subclass). Difference Between Bony Fish and Cartilaginous Fish:

1. Cartilaginous fish refers to fish that are not composed of hard bones, and the bones of bony fish are partially or completely ossified into hard bones, with bony plate-like scales, seams in the skull and in vitro fertilization. The main characteristic of bony fish is that they have a skeleton that is composed of at least part of true bone.

2. Compared with bony fish, cartilaginous fish have a special **receptor Ampulla loren's in addition to the lateral line. It is a capsule with a bulging base that detects water flow, pressure, and temperature, and is also an electroreceptor that can detect voltages as low as microvolts. Bony fish are highly developed vertebrates in waters, and are distributed throughout oceans, rivers and lakes with their wide range of radiation adaptations.