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Anonymous users2024-02-13Vertebrates. Aquatic fish are divided into: freshwater fish and saltwater fish. Animal characteristicsThe fish character pinyin (yú), fish (fish) is the oldest vertebrate.
Fishes are ectothermic aquatic vertebrates that swim and feed with their upper and lower jaws by respiring with their gills, swinging their tails and trunks, and feeding on their upper and lower jaws, and belong to the vertebrate subphylum of chordates, and generally divide vertebrates into five categories: fish (53%), birds (18%), reptiles (12%), mammals (9%), and amphibians (8%). According to the statistics of the late Canadian scholar Nelson in 1994, there are 24,618 species of fish in the world, accounting for more than half of the named vertebrates, and new species of fish are constantly being discovered, with an average of about 150 species per year, and more than 1,500 species should have increased in more than ten years, and the number of named fish species in the world is about 32,100 species.
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Anonymous users2024-02-12Fish belong to the group of ectothermic aquatic vertebrates.
Fishes are ectothermic aquatic vertebrates that swim and feed with their upper and lower jaws by respiring with their gills, swinging their tails and trunks, and feeding on their upper and lower jaws, and belong to the vertebrate subphylum of chordates, and generally divide vertebrates into five categories: fish (53%), birds (18%), reptiles (12%), mammals (9%), and amphibians (8%).
According to the statistics of the late Canadian scholar Nelson in 1994, there are 24,618 species of fish in the world, accounting for more than half of the named vertebrates, and new species of fish are constantly being discovered, with an average of about 150 species per year, and more than 1,500 species should have increased in more than ten years, and there are currently about 32,100 species of named fish species in the world.
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Anonymous users2024-02-111. Fish are considered animals and are vertebrates.
They usually live in the water, and there are many species, which are divided into freshwater fish.
and marine fish. It breathes with gills and swims through tail and trunk swings and fins coordination.
2. Fish is a meat that we often eat in our lives and is rich in vitamins.
Calcium, iron, phosphorus and other minerals, and the fat content is relatively low, regular consumption can supplement the nutrients needed by the human body, which is good for health.
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Anonymous users2024-02-10Vertebrate.
鲬字pinyin (yú), fish is the oldest vertebrate. They inhabit almost every aquatic environment on Earth
There are about 32,000 species of fish found in the world, and the fish live in the water, distributed in the ocean and freshwater, two-thirds of which live in the ocean, and the rest live in freshwater. There are 2,500 species in China, of which there are more than 100 kinds that can be used for medicine, and the common medicinal animals are seahorses, sea dragons, yellow eels, carp, crucian carp, sturgeon (the swim bladder is the maw gum), and the large yellow croaker (the otolith is the brain stone) liver oil.
Fish are mostly cold-blooded, and a few are warm-blooded, breathing with gills and having jaws and fins. The extant fish can be divided into two main ones.
Fish, accompanied by human beings for more than 5,000 years, have formed an indissoluble bond with human beings, and have become extremely important food and ornamental pets in human daily life, but people know very little about what animal is "fish" and how to define fish. With the development of science, people's definition of fish has also changed a lot.
When it comes to the largest creature on earth, people will think of the blue whale, which is more than 33 meters long and weighs more than 190 tons, and just one tongue of the blue whale weighs 2,000 kilograms, and their heart is worth a small car. >>>More
1. Cuttlefish is a squid.
Some people may be unfamiliar with the name cuttlefish, but when it comes to squid, they know it. Cuttlefish, also known as squid or flower branches, cuttlefish, is mainly known for its inkjet as a method of escape. As a specialty of coastal regions, cuttlefish is made into a variety of different dishes, but each dish has a unique taste. >>>More
Yes, in the Brazilian Amazon, there is a fish called man-eating pomfret that is very small in size and has sharp teeth, which can eat people, and it is said that if people want to cross the river, they must first throw a dead cow in the water, and when they eat the cow, take the opportunity to cross the river. >>>More
Salmon is rich in nutrients, rich in unsaturated fatty acids, and the protein in the fish contains 18 amino acids (including 8 essential amino acids), and the protein content is significantly higher than that of other fish. >>>More
When foraging, fish should first rely on sight or smell to judge the food and positioning, then rely on smell to perceive the smell of food, and then decide whether to eat, and finally rely on taste perception to decide whether to swallow food. Vision: Fish use vision to spot food when they are foraging**. >>>More