Everyone has eaten fish, but do fish have hearts?

Fish are the oldest vertebrates on Earth. All vertebrates have hearts, but compared to other vertebrates, fish have a relatively simple heart structure that also plays a role in promoting blood circulation. Although we all know that when it comes to aquarium fish, high water temperatures help to improve the condition and coat color of aquarium fish.

We love parrots, fish and live at 30 degrees and 22 degrees. Body color varies greatly, but living in such a high temperature environment also has a lot to do with it.

1. In addition to the breeding density, the main reason is that the water temperature we raise is too high. In such a high-temperature environment, the metabolism of goldfish is abnormal. But if you don't increase the oxygen in the water, as long as the breeding density is high, the goldfish will soon float on the surface of the water, and then start to rot the gills, and it will be more difficult.

For aquarium fish, a period of time is certainly unbearable. For example, if we keep tropical fish at a temperature of 22 to 25 degrees, we may ignore the color of the fish. If we raise the water temperature above 26 degrees, then the metabolism of aquarium fish will be stronger, which will make their hearts beat faster and their blood circulation faster.

Second, in this range, they are in the best conditionResistance, immunity, loss of appetite, coat color, and metabolism are all the best. And we have further raised the water temperature to more than 32 degrees, which is impossible to face every day, even in their place of origin. At such high temperatures, various physiques are slowly declining, and as a result, the lifespan of ornamental fish is shortened.

Third, many senior fish farmers, even if they want to see the normal development and growth of fishOr if you want to achieve a better body color, it is generally suitable for raising fish at high temperature at the fry stage. As the fish age, the water temperature decreases. In the grow-out stage, even high-grade tropical fish, the maximum water temperature for long-term rearing should not exceed 30 degrees Celsius.

If you keep ornamental fish at high temperatures for a long time, in case the ornamental fish has a slight disease, it will have to be reheated and the temperature adjusted. There is no room to raise the temperature of the water. These are all questions that we need to face.

There is a heart, but the heart of the fish is too small, and it is near the neck of the fish, which is difficult to detect when viewed with the naked eye, so its presence is often ignored.

Fish also have a heart because the heart of a fish only has one atria and one ventricle, which also plays a role in promoting blood circulation.

Fish have hearts, but their hearts are not particularly obvious, and their hearts are the lowest.

Fish have hearts, and they squeeze to promote blood circulation, maintain a certain amount of breathing and life.

Fish have hearts. Fish are the oldest vertebrates.

Vertebrates all have hearts, but fish are the lowest, with only one atrium and one ventricle, which plays the role of squeezing to promote blood circulation. The heart of the fish is next to the gills and is attached to the neck of the fish, and each fish has only one heart. The heart of a fish has only 2 chambers, 1 atria and 1 ventricle.

Mammalia. The heart has 4 chambers, 2 atria and 2 ventricles, and the bird heart also has 4 chambers. You can kill a live fish, and after disemboweling, slowly probe the throat of the fish with the middle finger of the hand, and then slowly pull it back, and the fish's heart and other organs will come out, and the position is in the abdominal cavity closest to the pectoral fin.

Types of fish. 1. Bighead carp.

The adaptability is very strong, widely distributed in China's east and west, north and south, whether warm south, or cold north, rivers, lakes and reservoirs are the areas where they are active, like warm water, filter feed plankton.

And plants, which are filter-feeding fish, are one of the economic fish species in our country and are also delicious on the public table.

2. Herring. It can be seen in all major water systems in China, and it is widely distributed, and likes to forage in the underwater layer and eat shellfish.

Insects, mollusks.

He also likes to eat grain-based foods. It likes warm and cold water, and is mostly found in the vast plains and rivers south of the Yangtze River, and many lakes and reservoirs have also begun to be cultivated in large quantities.

Yes.

The fish has a heart, next to the gills, attached to the neck of the fish, in the abdominal cavity closest to the pectoral fins. But fish are the lowest, with only two chambers, one atrium and one ventricle, which play the role of squeezing to promote blood circulation. Fish-specific organs include gills, fins, scales, and swim bladders, where gills help them breathe in the water, fins provide power and balance, scales protect themselves, and swim bladders make it easy to float and sink.

Fish are mainly divided into freshwater fish and marine fish, but they all have the characteristics of delicate and delicious meat, rich in nutrients, and are good for some vitamins and minerals. Fish has the effects of strengthening the brain, strengthening the spleen and stomach, and lowering blood pressure. Lowers blood pressure:

Fish protein is rich in methionine and taurine.

Yes. After disemboweling, slowly probe the throat of the fish with the middle finger of the hand, and then slowly pick it back! The heart of the fish and other organs come out!

Yes, in the biology class when I was a student, when the teacher taught to dissect fish, I was very careful to dissect it, because it was still beating in my hand at that time, and it felt amazing, so I asked the teacher what it was, and the teacher explained that it was the heart of a fish, which was the same as a human, and it would beat for a while after being cut.

Fish have liver, gallbladder, and viscera - fish do not breathe by fish bubbles. It is by the mouth and gills. And the nose.

Fish bubbles are used to get up and down the water. It can be said that it sinks to the bottom and floats on the surface of the water by this bubble. I'm sure you've all seen whales appear.

is a good example. When it sinks into the water, it uses a bubble to ride the water. Increasing its size allowed it to sink to the bottom of the sea.

Contrarily. then floats to the surface.