Fish Feed Machine Knowleagde

There are about 32,000 species of fish that have been discovered in the world. Fish live in water and are distributed in the ocean and freshwater. Two-thirds of the fish live in the ocean, and the rest live in freshwater.

There are 2,500 species in China, of which more than 100 species are available for medicinal purposes. Common medicinal animals are seahorse, sea dragon, rice field eel, carp, crucian carp, sturgeon (swallow is made of maw rubber), large yellow croaker (otolith) It is the main raw material of fish brain oil (vitamin A and vitamin D). Hydrolyzed protein, cytochrome C, lecithin, cephalin, etc. can be extracted from various fish. The liver and ovary of puffer fish contain a large amount of tetrodotoxin, which can be extracted to treat neuropathy, spasm, tumor and other diseases.

The bile of large fish can be extracted into "bile pigment calcium salt", which is the raw material for artificial bezoar. The differences between the classes of fish are as great as the classes of terrestrial vertebrates.

It is generally believed that fish are aquatic animals that are slippery and shaped like a spindle, streamlined, have fins, and breathe with gills, but more species do not meet this definition. Some fish are extremely long, some are extremely short; some are flat on the sides, some are flat; some have large or complex fins, and some degenerate and even digest; the shape and position of the mouth, eyes, nostrils, and gill openings vary greatly.

Fish is an important food for humans. Overfishing, pollution and environmental changes will destroy fish resources, and fish predation will help control malaria and other mosquito-borne diseases. Fish is an important experimental animal in behavior, physiology, ecology and medicine.

Fish are mostly cold-blooded animals, and a few are warm-blooded animals, breathe with gills and have jaws and fins. Existing fishes can be divided into two main groups: cartilaginous fishes (such as sharks, etc.) and bony fishes (fish with linear and wavy fins).

Fish of these two ethnic groups were the first to emerge from the Early Devonian. The more advanced group of linear fin fishes are called bony fishes, which began to evolve in the Jurassic and have become the fish with the largest number of individuals. There are also several species of fish that have become extinct.

The appendages of fish are fins, which are the organs of movement for swimming and maintaining body balance. The fins are composed of basal fins and fin rays. There are two types of fin rays. One type of angular fin rays is not segmented or branched. It occurs from the epidermis and is found in cartilaginous fishes;

The other is scaly fin rays or bony fin rays, derived from scales, with segmented, branched or unbranched, seen in bony fishes, and thin fins are connected between the fins. Bone fin rays are divided into two types: fin spines and soft rays. The fin spines are formed by deformation of one kind of fin rays. They are hard spines that neither branch nor segment, and are owned by higher fish.

The soft strips are soft and knotted, and their distal branches (called branched fins) or non-branched (called non-branched fins) are formed by merging the left and right halves. There are two types of fins: odd fins and even fins. Even fins are pairs of fins, including a pair of pectoral and pelvic fins, which are equivalent to the fore and hind limbs of terrestrial vertebrates; odd fins are unpaired fins, including dorsal fin, caudal fin, and anal fin (anal fin).

The basic function of the dorsal fin and anal fin is to maintain body balance, prevent tilting and sway, and help swimming. The tail fin, like the rudder, controls the direction and pushes the fish forward. Common fishes have the above-mentioned five types of fins: thorax, abdomen, back, buttocks, and tail. But there are a few exceptions, such as the rice field eel has no even fins, and the odd fins are also degenerated; eels have no pelvic fins; electric eels have no dorsal fins, and so on.

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