spermatogenesis in fish By Harsh Dhimmar
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what is spermatogenesis?; stages of spermatogenesis: process of spermatogenesis; maturation of spermatozoa all things is contributed in this ppt. short and important details is covered.
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The precise combination of environmental factors required for maturation, ovulation and spawning.
However, quite often, under farm conditions, the requisite environmental factors are either not available or do not persist for sufficient length of time for spontaneous maturation to occur.
The pioneering discovery of B.A. Houssay (1931) and Von Ihering (1935, 1937, Argentina) that fishes can be induced to spawn by injecting pituitary homogenates has somewhat mitigated the problem.
The principal advantage of this technique, referred to in aquaculture parlance as “Hypophysation.”
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1. Induced breeding is a technique where ripe fish are stimulated to breed in captivity using pituitary hormones or synthetic hormones.
2. The history of induced breeding began in the 1930s in Argentina and Brazil, and was first applied to Indian major carps like Cirrhinus mrigala in the late 1930s.
3. Induced breeding is needed because environmental conditions and hormone levels may be insufficient to trigger natural spawning in captive conditions.
Age and growth
At what age does a fish attain a maturity
What is the perfect catchable or mark able size of the fish
It helps to calculate the life span and longevity of fish
It enables to estimate and compare growth rates of fish in different waters.
Good or bad growth can point out the suitability for rearing and stocking purposes
The timing of spawning migration of given species can be worked out .
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Spermatogenesis is the process by which sperm cells are produced in the testes. It begins with spermatogonia in the seminiferous tubules dividing mitotically and then undergoing meiosis to form haploid spermatids. Spermiogenesis then transforms spermatids into mature sperm cells through morphological changes. Finally, spermiation releases the mature sperm from Sertoli cells into the lumen of the tubules. The sperm then travel to the epididymis where they undergo further maturation before being ejaculated.
SPERMATOGENESIS.pdf
Detailed notes on Spermatogenesis.
It includes
Spermatogenesis
Formation of SPERMATIDS
Spermiogenesis
Spermatocytogenesis
STRUCTURE of Spermatozoa
Easy PPT presentation for seminars.
For medical students.
MBBS,BDS, Nursing
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This document provides an overview of reproductive biology in fishes. It discusses the different types of sexuality observed in fishes, including unisexuality, bisexuality, hermaphroditism, and parthenogenesis. It describes the reproductive cycles and hormones that regulate reproduction for both male and female fish. Key aspects covered include the gonads, sexual dimorphism, seasonal breeding patterns, and hormonal control of the reproductive system through the CNS-pituitary-gonad axis.
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A SEMINAR ON INDUCING AGENTS OF HYPOPHYSATION
The precise combination of environmental factors required for maturation, ovulation and spawning.
However, quite often, under farm conditions, the requisite environmental factors are either not available or do not persist for sufficient length of time for spontaneous maturation to occur.
The pioneering discovery of B.A. Houssay (1931) and Von Ihering (1935, 1937, Argentina) that fishes can be induced to spawn by injecting pituitary homogenates has somewhat mitigated the problem.
The principal advantage of this technique, referred to in aquaculture parlance as “Hypophysation.”
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the presentation provides the details regarding, Tthe broodstock nutrition, essential nutrients and recent data on broodstock nutrition; also larval nutrition; the hatchery utilised live feeds in detail and also microparticulate diet, the recent knowlwdge on essential elements amd minerals in larval nutrition, like taurine, phospholipids, liposomes, waxy spray beds etc
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Composite fish culture involves culturing multiple compatible fish species together in a pond to maximize fish yield and productivity. It enables full utilization of available fish feed by including species with different feeding habits, such as surface feeders, column feeders, and bottom feeders. Common fish used include Indian major carps like rohu, catla, and mrigal as well as exotic carps like grass carp and silver carp. Proper pond preparation, fertilization, stocking density, feeding practices, and harvesting are required to achieve high production yields of 4-6 tons per hectare annually through this polyculture technique.
Hybridization in fishes
Hybridization is the act of breeding between two different fish species or genera that do not ordinarily interbreed. There are two types: natural hybridization which can occur when species spawn in the same area due to habitat changes, and artificial hybridization where gametes are manually mixed. This results in a hybrid offspring that has intermediate physical characteristics between the parents. Examples include hybrids of different carp species. Hybrids can be diploid or polyploid depending on chromosome manipulation techniques used. While hybridization may have economic benefits, uncontrolled hybridization could cause losses.
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This document discusses the feeding habits and nutritional requirements of fish at different life stages. It begins by explaining that fish require energy, amino acids, fatty acids, vitamins, and minerals to sustain life and promote growth. It then discusses the feeding behaviors and nutritional needs of fish larvae, including their underdeveloped digestive systems and reliance on plankton and zooplankton. The document also categorizes different types of food sources for fish and classifies fish based on their dependence on food types and positions in the water column. Specific examples are provided of the feeding behaviors of fish larvae, juveniles, and adults.
Eye Stalk Ablation in Crustaceans
This document discusses eye stalk ablation in crustaceans as a method to induce maturation for seed production. It provides background on the process, including that removal of the eyestalk reduces inhibitory hormones and allows maturation. Unilateral ablation is typically used, as bilateral ablation can cause stress and reabsorption of eggs. The effects, methods, timing, and process of ablation are described in detail. Maintaining appropriate conditions after ablation is also discussed to support maturation and spawning.
Conditioning and packaging of ornamental fish for transportation.pdf
Conditioning and packaging of ornamental fish for transportation is important to minimize mortality during transport. Conditioning involves holding fish for several days prior to transport, providing treatments, removing dead fish, grading by size, and starving fish. Proper packaging uses oxygenated bags filled with treated water, and zeolite to remove ammonia. Fish are packaged individually or by size and the bags are placed in insulated boxes for transport. Attention to conditioning, water quality, stocking density and packaging helps ensure fish arrive alive at their destination.
Sewage fed fisheries
This document discusses sewage-fed fish culture, which involves using treated sewage water to culture fish. It provides background on the history and present status of sewage-fed fish culture. The key processes involved are primary and secondary sewage treatment through sedimentation, dilution, and storage before releasing into fish ponds. Farmers culture various fish species using techniques like pond preparation, primary fertilization through sewage, stocking, feeding, and harvesting fish for market. While sewage-fed culture benefits waste recycling and low input costs, it can also pose health risks if not properly managed.
Etroplus- culture
Etroplus the state fish of Kerala, India have great demand. the presentation deals with the aquaculture of etroplus
indused breeding for fish
1. Induced breeding is a technique where ripe fish are stimulated to breed in captivity using pituitary hormones or synthetic hormones.
2. The history of induced breeding began in the 1930s in Argentina and Brazil, and was first applied to Indian major carps like Cirrhinus mrigala in the late 1930s.
3. Induced breeding is needed because environmental conditions and hormone levels may be insufficient to trigger natural spawning in captive conditions.
Age and growth
At what age does a fish attain a maturity
What is the perfect catchable or mark able size of the fish
It helps to calculate the life span and longevity of fish
It enables to estimate and compare growth rates of fish in different waters.
Good or bad growth can point out the suitability for rearing and stocking purposes
The timing of spawning migration of given species can be worked out .
Present Scenario and Problems of Aquaculture in India.pptx
- India is the 2nd largest aquaculture producer in the world and aquaculture contributes about 74% of India's total fish production. However, the aquaculture industry faces several social, economic, technological, and environmental problems. This includes issues like high input costs, lack of financial assistance, water pollution from farms, and disease outbreaks affecting production. While India has vast aquaculture resources like ponds, rivers, and reservoirs, current production levels remain low due to these challenges. There is potential to further develop the industry by addressing these problems and utilizing new technologies and schemes under government programs.
Induced breeding in fishes
This document discusses induced breeding techniques for fish. It begins with an introduction and outline, then describes the history and need for induced breeding when fish do not naturally breed in captivity due to environmental or hormonal factors. It explains that induced breeding involves stimulating fish with pituitary extracts or hormones to breed. The document provides details on techniques for induced breeding, including collecting and preserving pituitary glands, preparing extracts, selecting and injecting brood fish, and stripping eggs and milt. It notes some advantages of induced breeding for fish culture and management.
Pearl spot (Etroplus suratensis)
This slide is about a pearl spot fish which includes about its habit, habitat ,morphology, food and feeding, breeding behaviour, hatching, larval rearing, embryonic development, nutritive values, farming practices, seed production and pond preparation...
Ornamental fish breeding
The document discusses the global ornamental fish trade and breeding of popular species. It provides details on the production of egg-laying fish like goldfish and angel fish which require different care depending on parental behaviors. Methods for breeding live-bearing fish such as guppies, platies, swordtails and mollies are also outlined, noting internal fertilization and live birth of young.
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Fish nutrition and feed technology 4th sem (full sylabus)
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Similar to spermatogenesis in fish By Harsh Dhimmar
Spermatogenesis Anju - Copy.pptx
Spermatogenesis is the process by which sperm cells are produced in the testes. It begins with spermatogonia in the seminiferous tubules dividing mitotically and then undergoing meiosis to form haploid spermatids. Spermiogenesis then transforms spermatids into mature sperm cells through morphological changes. Finally, spermiation releases the mature sperm from Sertoli cells into the lumen of the tubules. The sperm then travel to the epididymis where they undergo further maturation before being ejaculated.
SPERMATOGENESIS.pdf
Detailed notes on Spermatogenesis.
It includes
Spermatogenesis
Formation of SPERMATIDS
Spermiogenesis
Spermatocytogenesis
STRUCTURE of Spermatozoa
Easy PPT presentation for seminars.
For medical students.
MBBS,BDS, Nursing
SPERMATOGENESIS.pptx
Detailed notes on Spermatogenesis
It includes
Spermatogenesis
Spermatocytogenesis
Formation of SPERMATIDS
Spermiogenesis
STRUCTURE of Spermatozoa
Diagrams
Flowcharts
Easy for seminar presentation
For MBBS,Dental and Nursing Students
Reference from textbook of Clinical Embryology (Vishram Singh)
Embryology Lecture 3 spermatogenesis
Spermatogenesis is the process by which sperm cells are produced in the testes in males. It involves the transformation of spermatogonia into mature sperm through two stages: spermatocytogenesis where primordial germ cells develop into spermatids, and spermiogenesis where spermatids are transformed into mature sperm. In humans, it takes approximately 74 days to complete and produces around 300 million sperm cells daily. Oogenesis is the similar process that occurs in females within the ovaries to produce eggs.
GAMETOGENISIS.pptx
Spermatogenesis consists of three stages: mitotic proliferation of spermatogonia, meiosis of spermatocytes, and spermiogenesis where spermatids are packaged into sperm. During mitotic proliferation, spermatogonia undergo mitosis and differentiate into primary spermatocytes. Meiosis of the spermatocytes then produces haploid spermatids. Spermiogenesis involves the spermatids developing into mature sperm through resorption of cytoplasm and formation of characteristic sperm structures like the head, midpiece and tail. Hormones like FSH, LH and testosterone regulate and trigger the process of spermatogenesis.
Spermatogenesis
Spermatogenesis is the process by which sperm cells develop from stem cells in the seminiferous tubules of the testes. It begins with the mitotic division of spermatogonial stem cells into primary spermatocytes, which then undergo meiosis to form haploid spermatids. The spermatids develop tails and mature into spermatozoa through spermiogenesis. Sertoli cells support this process by maintaining the environment, secreting substances, and protecting the developing cells. Spermatogenesis is regulated by hormones like testosterone and FSH and sensitive to fluctuations in temperature.
Spermatogenesis presentation.ppsx
The biological process via which the testes, the male reproductive organs, produce sperm cells is known as spermatogenesis. It begins with the development of immature germ cells from stem cells in the seminiferous tubule walls, which grow into mature sperm cells featuring a condensed nucleus, a head, and a tail.
Male & female reproductive system
The reproductive systems of males and females ensure the continuation of species through the production of gametes and sex hormones. In males, the testes produce sperm and male hormones. Accessory organs like the seminal vesicles and prostate gland contribute to semen. Spermatogenesis is the process where sperm develop from spermatogonia in the seminiferous tubules with help from Sertoli and Leydig cells. At ejaculation, sperm and fluids are released. In females, the ovaries produce eggs and female hormones. The fallopian tubes, uterus, cervix and vagina form the female reproductive tract, while the labia, clitoris and breasts also play roles in reproduction.
Male & female reproductive system
The reproductive system ensures continuation of species through reproduction. The male reproductive system contains primary sex organs (testes) that produce sperm and accessory sex organs (seminal vesicles, prostate gland, urethra) that aid in ejaculation. Spermatogenesis occurs in the testes through four stages - proliferation, growth, maturation and transformation - to produce mature sperm from germ cells over 74 days, aided by hormones like FSH, testosterone and estrogen. Testosterone is responsible for masculine development and functions in fetal life like sex differentiation and in adulthood like maintenance of spermatogenesis.
TESTIS.pptx
The document discusses the male reproductive system. It describes the testes as the male gonads that produce sperm and testosterone. The testes receive blood from the testicular artery and drain into the testicular vein. They have layers including skin, fascia, muscle and the tunica vaginalis. Within the testes are seminiferous tubules containing Sertoli and Leydig cells that support sperm production and testosterone release. Spermatogenesis is the process where spermatogonia undergo meiosis and maturation into spermatozoa, which are transported through the epididymis and vas deferens.
Male reproductive system
The male reproductive system ensures the continuation of species. The testes are the primary sex organs that produce sperm through spermatogenesis. Spermatogenesis is the process by which sperm are formed from primitive germ cells in the testes over 74 days. It occurs in four stages: proliferation, growth, maturation, and transformation. The testes also secrete male sex hormones called androgens, including testosterone. Testosterone is responsible for masculine physical traits and plays an important role in fetal development and adult sexual maturation.
Spermatogenesis Anju.pptx
Spermatogenesis is the process by which sperm cells are produced in the testes. It begins with spermatogonia in the seminiferous tubules dividing mitotically and then undergoing meiosis to form haploid spermatids. Spermiogenesis then transforms spermatids into mature sperm cells through morphological changes. Finally, spermiation releases the mature sperm from the seminiferous tubules into the epididymis where they are stored until ejaculation.
Male reproductive system
The male reproductive system consists of external and internal genitalia. The external genitalia include the scrotum and penis, while the internal genitalia include the testes, vas deferens, seminal vesicles, prostate, and bulbourethral glands. The testes produce sperm and the hormone testosterone. Within the testes are seminiferous tubules containing spermatogenic cells such as spermatogonia and Sertoli cells that support sperm production through spermatogenesis, which takes approximately 64 days to complete in humans.
Differentiation and maturation of spermatogenic stem cell
Spermatogenesis is the process by which spermatogenic stem cells in the testes mature and develop into mature male gametes called spermatozoa. It occurs in three stages - spermatocytogenesis where spermatogonia form spermatocytes, spermatidogenesis where spermatocytes form spermatids, and spermiogenesis where spermatids undergo morphological changes to form spermatozoa. The process is controlled by hormones like testosterone and takes place in the seminiferous tubules of the testes over 64 days from start to finish.
Reproductive system.pdf
The document provides information about the male and female reproductive systems. It describes the key organs involved in both systems, including the testes, penis, scrotum, seminal vesicles, prostate, and vas deferens in the male system. In the female system it outlines the ovaries, fallopian tubes, uterus, cervix, and vagina. It also explains processes like spermatogenesis and the menstrual cycle. The reproductive systems work together to produce offspring through the processes of reproduction and genetic transfer between generations.
Male reproductive system by Pandian M, tutor, Dept of Physiology, DYPMCKOP,MH
Male reproductive functions
The male reproductive tract
Sagittal segments of testes and epididymis
Adolescence
General Physical Changes
Stages of spermatogenesis
Structure of the human spermatozoon.
Pathway for the passage of sperms
Semen
Composition & function
Capacitation
Factors affecting spermatogenesis
Hormones necessary for spermatogenesis
Functions of testosterone
Disorders of sexual development / applied
Spermatogensis
Spermatogenesis is the process of sperm production in the testes. It involves spermatidogenesis and spermiogenesis. Spermatidogenesis includes the multiplication, growth, and maturation phases which produce spermatids from germ cells. Spermiogenesis transforms round spermatids into elongated, motile sperm through changes like nuclear shaping and the formation of organelles like the acrosome and mitochondria. Hormones like FSH and LH regulate spermatogenesis by stimulating Leydig and Sertoli cells. The end result is the production of haploid sperm capable of fertilizing eggs.
Spermatogenesis (Male Reproductive System-2)
1. Spermatogenesis is the process by which sperm develop from spermatogonia in the seminiferous tubules of the testes into mature sperm over approximately 65 days.
2. During spermatogenesis, spermatogonia undergo mitosis and meiosis to become spermatocytes and then spermatids, developing into mature sperm.
3. Sertoli cells nurture and support the developing sperm cells through spermatogenesis, and Leydig cells in the testes secrete testosterone which drives spermatogenesis.
Male reproductive physiology
Male reproductive functions include spermatogenesis (formation of sperm), sexual acts, and regulation by hormones. Spermatogenesis occurs in the seminiferous tubules and takes around 74 days, involving the transformation of spermatogonia into spermatozoa. Testosterone produced in the testes initiates male development and drives physiological changes during puberty like increased muscle and bone growth, body hair growth, and voice deepening. Infertility in males can result from low sperm counts, abnormal sperm morphology, obstructions in the reproductive ducts, or disorders of the testes, pituitary, or hypothalamus.
Overview of reproductive physiology and anatomy
The male reproductive system produces sperm and sex hormones. Sperm are produced in the testes through spermatogenesis and stored in the epididymis. Hormones like FSH, LH and testosterone regulate sperm production and male characteristics. During sexual activity, erection occurs when blood flow increases to the penis. Ejaculation involves the contraction of muscles to expel semen containing sperm from the penis.
Similar to spermatogenesis in fish By Harsh Dhimmar (20)
Differentiation and maturation of spermatogenic stem cell
Differentiation and maturation of spermatogenic stem cell
Male reproductive system by Pandian M, tutor, Dept of Physiology, DYPMCKOP,MH
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spermatogenesis in fish By Harsh Dhimmar
- 1. SPERMATOGENESIS • Submitted To :- – Prof. H V Parmar sir – College of Fisheries – Veraval • Submitted by :- – Harsh Dhimmar – Reg. No. -3030315021 – Roll No – 14
- 2. What is spermatogenesis ? • Spermatogenesis is the process by which male primordial germ cells called spermatogonia undergo meiosis, and produce a number of cells termed spermatozoa. • The initial cells in this pathway are called primary spermatocytes • In short the formation of sperm its called Spermatogenesis
- 3. Spermatogenesis can be divided into following six stages 1. Spermatogonia 2. Spermatogonium 3. Primary spermatocytes 4. Secondary spermetocytes 5. Spermatids 6. Spermetozoa Spermiogenesi s Spermatogenesis
- 5. Spermatogonia • A spermatogonia is an undifferentiated male germ cell, originating in a somniferous tubule and dividing into two primary spermatocytes in the production of spermatozoa.
- 6. Spermatogonium • The spermatogonia divide mitotically and give rise to small round spermatogonium with centrally placed nucleus. • Structurally , these are similar to spermatogonia except in their size.
- 8. Primary Spermatocytes • Spermatogonium which resides in the basal compartment of somniferous tubules, divides mitotically to produce two diploid intermediate cells called primary spermatocytes. • This stage is also known as ‘synizesis knot’. • The nucleolus is not visible in this stage.
- 9. Secondary spermatocytes • The reduction division of primary spermatocytes results in the formation of secondary spermatocytes. • The nucleolus is absent and the cytoplasm is less in amount.
- 11. Spermatids • The spermatids are formed as a result of second meiotic division of the secondary spermatocytes. • The spermatids are much smaller than the secondary spermatocytes. • The nucleus of spermatid is more or less round in shape.
- 12. Spermatozoa • The spermetids ultimately into mature spermatozoa (spermatogenesis) by orientation and reorganization of nucleus and cytoplasm together with the development of flagellum.
- 13. Cont… • The mature spermatozoa is appear to have many parts: The nucleus Head The Golgi appratus Acrosomic cap The Mitochondria Middle piece The Flagellum Tail