Fish anatomy is a study of the form or morphology of male or female fish. It can be contrasted with fish physiology, a study on how fish components play a role in live fish.
In practice, fish anatomy and fish physiology complement each other, the former dealing with the structure of a fish, its organs or component parts and how they are combined, such as observed on an anatomical table or under a microscope, and how the latter works together in biological fishing gear.
The anatomy of a fish is usually formed by the physical characteristics of water. Water is much denser than air, holds a relatively small amount of dissolved oxygen, and absorbs more light than air.
The fish’s body is divided into the head, trunk and tail, although the division between the three is not always visible outside. The bones that form the support structure of the fish are either made of bones in cartilage, cartilage or bone fish.
The main skeletal element is the vertebrae column, composed of light but powerful articulated vertebrae. The ribs are attached to the spine and have no limbs or limbs.
The main external feature of a fish, namely the fin, consists of bone or soft spines, called rays, and has no direct connection with the spine except the caudal fin. They are supported by the muscles that make up the main part of the trunk.
The heart has two chambers and pumps blood through a single circulation ring through the breathing surface of g and the surrounding body. The eyes are suitable for underwater, with only local vision.
There is an inner ear, but no outer ear or middle ear. Low-frequency vibrations are detected by the transverse line system of sensory organs extending along the side of the fish, which respond to nearby movements and changes in water pressure.
testis
Most male fish are similar in size. For sharks, the right testicles are usually larger. The original ignorant fish has only one testicle, located in the midline of the human body, although this is even formed by the fusion of paired structures in the embryo.
Under a hard membrane shell, the testicles of some bony fish contain very thin coiled tubes called vasculogenic tubes. The tubules are lined with a layer of cells (germ cells) that develop from puberty to old age to become sperm cells (also known as sperm or male gametes).
The developing sperm travels through the sperm tubules to the rete testes located in the mediastinal testes, the efferent catheter, and then to the additional membrane, and then to the newly created epigenetic membrane of the sperm cells (see Spermgenesis).
Sperm enters VAS prolongs and eventually expels muscle contractions through the urethra.
However, most fish do not have sperm-generating tubules. Instead, sperm is produced using a spherical structure called Sperm plants. These are seasonal structures that release their contents during the breeding season and are then reabsorbed by the body.
Before the next breeding season, new sperm membranes begin to form and mature. Osteotomy is otherwise essentially the same as the spermatogenetic tubules in higher vertebrates (including the same range of cell types).
In terms of sperm distribution, there are two types of structures of bone testicles: most commonly, spermia occurs along the entire sperm tubules, while in atherosclerotic fish they are confined to the distal portion of these structures.
Fish can develop cystic or semicystic spermatogenesis in cysts that are associated with the release stage of germ cells in germ cells.
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Ovarian
Many characteristics found in the ovaries are common to all vertebrates, including the presence of follicle cells and Aspergillus. At any given time, hundreds or even millions of fat eggs may exist in the ovaries of female fish. Fresh eggs may develop from hair-growing epithelium throughout life.
Corpora lutea is found only in mammals and in some elastic fish; in other species, the residue of follicles is quickly covered by the ovaries. The bony ovary usually contains a hollow, lymphatic space that opens to the fallopian tube and emits eggs.
Most common female fish have two ovaries. In some elastic branches, only the right ovary can develop fully. Among the original ignorant fish and some bony fish, only one ovary is formed by the fusion of paired organs in the embryo.
There may be three types of ovaries: gymnasium, middle school gymnasium, or nursing home. In the first type, the oocytes are released directly into the cavity, then enter the ostium, which then enters the mouth through the fallopian tube and eliminates. From there, the ovaries in the middle school gymnasium directly enter the fallopian tube and enter the oval shape. In the third type, oocytes are delivered to the outside through the fallopian tube.
The gymnasium is the original condition found in lungfish, stfish and abalone. The cystic dynamics are the most quantitative characteristics, in which the ovarian cavity is continuity with the fallopian tube. Secondary gymnastics exercises were found in salmon and some other hard aggregates.
egg
Salmon female eggs are in different developmental stages. In some of the few cells on the top of the yolk, the lower right is the blood vessel surrounding the yolk, and on the upper left, visible to the dark eyes.
The eggs of female fish and amphibians are jelly. Cartilage fish (shark, skates, rays, chimera) eggs are fertilized internally and exhibit a wide variety of internal and external embryonic developments. Most female fish lay eggs externally fertilized, usually the eggs of male fish after the female fish has put down the eggs.
These eggs have no shell and will dry in the air. Even amphibians breathing in air, put eggs in water, or in protective foam, just like coastal foam – New York Frog (Treefog) Chiromantis Xerampelina.
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Inner organ
This young male spinning shark has buttons and modifications to the pelvic fins also act as an internal organ
The fins of male cartilage fish (sharks and rays) and some live ray-finned fish have been modified to act as inclusion organs, and reproductive appendages allow internal fertilization. Among the thunderfin fish, they are called son or Male plantsknown as a cartilage fish button.
Gonopodia Found on male fish of certain species in the Anablepidae and Poeciliidae families. They are anal fins modified to act as movable internal organs for impregnating female fish with MILT during mating.
The third, fourth and fifth rays of the anal fin of the male fish are formed into a tubular structure in which the fish’s sperm ejects. When preparing for mating, the lymphatic tract will become erect and point forward towards the female.
The male quickly inserts the organ into the female’s sexual opening and has a hook-like adaptability that allows the fish to hold onto the female to ensure impregnation. If the female remains still and her partner contacts her son for her venting, she will be fertilized. Sperm is preserved in the fallopian tubes of the female fish. This allows the female to fertilize at any time without further assistance from the male.
In some species, the sub can be half the overall length. Sometimes, fins are too long to use, for example in the ‘lyreart’ variety Xiphophorus Heli. Hormone-treated female fish may develop lymphatic tracts. These are useless for reproduction.
Similar organs with similar characteristics have also been found in other fish Androgen In Hemirhamphodon or Goodeidae.
A button was found on the male cartilage fish. They are the posterior part of the pelvic fins and have also been modified to act as an inclusion organ and are used during mating to deliver semen into the cloaca of the female fish.
The behavior of mating in sharks usually involves lifting a hanging paper to allow water to enter the siphon through a specific orifice. The cliff is then inserted into the cloaca, where it opens like an umbrella to anchor the position. Then, the siphon starts contracting the drain of water and sperm.
physiological
Oogonia FISH in bony fish differed in the group, and the determination of egg-genesis dynamics can be understood as maturation and fertilization processes. Changes in the nucleus, eggs and surrounding layers characterize the oocyte maturation process.
The follicle is the structure formed after the oocyte is released. They have no endocrine function, have extensive irregular cavity, and are rapidly absorbed during processes involving follicle apoptosis.
A degenerate process called follicle atresia does not produce ovarian oocytes. This process may also occur but is less frequent in oocytes at other development stages.
Some fish are hermaphrodites, with testicles and ovaries throughout their life cycle, or as in small villages, keeping them at the same time.
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