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Fish Reproduction - Anatomy & Physiology (view source)
Revision as of 15:22, 4 January 2023
, 15:22, 4 January 2023no edit summary
== Introduction ==
== Introduction ==
* Primary ovarian cells line hollow cavities with folded walls.
* Primary ovarian cells line hollow cavities with folded walls.
** Oogonia are shed into this cavity, gaining a layer of epithelial cells in the process.
** Oogonia are shed into this cavity, gaining a layer of epithelial cells in the process.
** Become [[The_Ovary_-_Follicles_- Anatomy & Physiology|granulosa cells]], responsible for yolk formation in the developing egg.
** Become [[Follicles - Anatomy & Physiology|granulosa cells]], responsible for yolk formation in the developing egg.
* Ovarian [[The_Ovary_-_Follicles_- Anatomy & Physiology|follicle]] grows.
* Ovarian [[Follicles - Anatomy & Physiology|follicle]] grows.
** Hyaline zone forms between the oocyte and the epithelial cells - the zona pellucida.
** Hyaline zone forms between the oocyte and the epithelial cells - the zona pellucida.
* Primative
* Primative
* [[The_Ovary_-_Oocytes_- Anatomy & Physiology|Oocytes]] are released directly into the coelomic cavity
* [[Oogenesis - Anatomy & Physiology|Oocytes]] are released directly into the coelomic cavity
* Enter the ostium
* Enter the ostium
* Travel through the [[Female_Reproductive_Tract_-The_Oviduct_- Anatomy & Physiology|oviduct]] and are eliminated.
* Travel through the [[Oviduct - Anatomy & Physiology|oviduct]] and are eliminated.
==== Secondary Gymnovarian ====
==== Secondary Gymnovarian ====
* Salmonids and a few other teleosts.
* Salmonids and a few other teleosts.
* [[Female_Reproductive_Tract_-The_Ovary_- Anatomy & Physiology|Ovaries]] shed ova into the coelom
* [[Ovary - Anatomy & Physiology|Ovaries]] shed ova into the coelom
* Go directly into the [[Female_Reproductive_Tract_-The_Oviduct_- Anatomy & Physiology|oviduct]].
* Go directly into the [[Oviduct - Anatomy & Physiology|oviduct]].
==== Cystovarian ====
==== Cystovarian ====
* Most teleosts
* Most teleosts
* [[The_Ovary_-_Oocytes_- Anatomy & Physiology|Oocytes]] are conveyed to the exterior through the ovarian duct (not oviduct).
* [[Oogenesis - Anatomy & Physiology|Oocytes]] are conveyed to the exterior through the ovarian duct (not oviduct).
** Ovarian lumen is continuous with the ovarian duct.
** Ovarian lumen is continuous with the ovarian duct.
==== Post-Oocyte release ====
==== Post-Oocyte release ====
* Postovulatory [[The_Ovary_-_Follicles_- Anatomy & Physiology|follicles]] are formed after [[The_Ovary_-_Oocytes_- Anatomy & Physiology|oocyte]] release
* Postovulatory [[Follicles - Anatomy & Physiology|follicles]] are formed after [[Oogenesis - Anatomy & Physiology|oocyte]] release
** Do not have endocrine function
** Do not have endocrine function
** Wide irregular lumen
** Wide irregular lumen
** Rapidly reabosrbed in a process involving the apoptosis of [[The_Ovary_-_Follicles_- Anatomy & Physiology|follicular cells]].
** Rapidly reabosrbed in a process involving the apoptosis of [[Follicles - Anatomy & Physiology|follicular cells]].
* A degenerative process called follicular atresia reabsorbs vitellogenic [[The_Ovary_-_Oocytes_- Anatomy & Physiology|oocytes]] not spawned.
* A degenerative process called follicular atresia reabsorbs vitellogenic [[Oogenesis - Anatomy & Physiology|oocytes]] not spawned.
** This process can also occur, but less frequently, in [[The_Ovary_-_Oocytes_- Anatomy & Physiology|oocytes]] in other development stages.
** This process can also occur, but less frequently, in [[Oogenesis - Anatomy & Physiology|oocytes]] in other development stages.
=== Oviparity ===
=== Oviparity ===
* 97% of fish
* 97% of fish
* Mostly '''external fertilisation''', with the male and female fish shedding their gametes into the surrounding water.
* Mostly '''external fertilisation''', with the male and female fish shedding their gametes into the surrounding water.
* A few oviparous fishes practise [[Fertilisation%2C_Implantation_and_Early_Embryonic_Development_-Fertilisation- Anatomy & Physiology|'''internal fertilisation''']], with the male using an intromittent organ to deliver sperm into the genital opening of the female.
* A few oviparous fishes practise [[Fertilisation - Anatomy & Physiology|'''internal fertilisation''']], with the male using an intromittent organ to deliver sperm into the genital opening of the female.
** Species that pracitce [[Fertilisation%2C_Implantation_and_Early_Embryonic_Development_-Fertilisation- Anatomy & Physiology|internal fertilization]] include oviparous sharks, such as the horn shark, and oviparous rays, such as skates.
** Species that pracitce [[Fertilisation - Anatomy & Physiology|internal fertilization]] include oviparous sharks, such as the horn shark, and oviparous rays, such as skates.
** In these cases, the male is equipped with a pair of modified pelvic fins known as claspers.
** In these cases, the male is equipped with a pair of modified pelvic fins known as claspers.
* The newly-hatched young are called larvae.
* The newly-hatched young are called larvae.
* Long before spawning, seasonal cues begin the process of maturation.
* Long before spawning, seasonal cues begin the process of maturation.
** In many fish, this can take up to a year.
** In many fish, this can take up to a year.
* When the gametes have matured, an environmental stimulus may signal the arrival of optimal conditions, triggering [[The_Ovary_-_Ovulation_- Anatomy & Physiology|ovulation]] and spawning.
* When the gametes have matured, an environmental stimulus may signal the arrival of optimal conditions, triggering [[Ovulation - Anatomy & Physiology|ovulation]] and spawning.
** Examples of environmental stimuli are:
** Examples of environmental stimuli are:
*** Changes in photoperiod
*** Changes in photoperiod
** Finally, the walls of the germinal vesicle break down, releasing the chromosomes into the cell.
** Finally, the walls of the germinal vesicle break down, releasing the chromosomes into the cell.
* After the egg has matured, prostaglandins are synthesized.
* After the egg has matured, prostaglandins are synthesized.
** Stimulate [[The_Ovary_-_Ovulation_- Anatomy & Physiology|ovulation]]
** Stimulate [[Ovulation - Anatomy & Physiology|ovulation]]
* The egg is then released into the body cavity or ovarian lumen, where it may subsequently be released to the outside environment.
* The egg is then released into the body cavity or ovarian lumen, where it may subsequently be released to the outside environment.
* Following [[The_Ovary_-_Ovulation_- Anatomy & Physiology|ovulation]], the viability of the eggs can decrease rapidly.
* Following [[Ovulation - Anatomy & Physiology|ovulation]], the viability of the eggs can decrease rapidly.
== Sex Determination ==
== Sex Determination ==
* An asexual form of reproduction found in females where growth and development of embryos occurs without fertilization by males.
* An asexual form of reproduction found in females where growth and development of embryos occurs without fertilization by males.
* 100% female contribution.
* 100% female contribution.
* Self-activated [[The_Ovary_-_Oocytes_- Anatomy & Physiology|oocytes]] require no contribution from sperm.
* Self-activated [[Oogenesis - Anatomy & Physiology|oocytes]] require no contribution from sperm.
* The offspring produced by parthenogenesis almost always are female in species where the XY chromosome system determines gender.
* The offspring produced by parthenogenesis almost always are female in species where the XY chromosome system determines gender.
* Occurs in very few fish species.
* Occurs in very few fish species.
== [[Exotics - Fish Inducing Reproduction - Anatomy & Physiology|Inducing Reproduction]] ==
== [[Fish - Inducing Reproduction - Anatomy & Physiology|Inducing Reproduction]] ==
==Webinars==
<rss max="10" highlight="none">https://www.thewebinarvet.com/urogenital-and-reproduction/webinars/feed</rss>
[[Category:Exotic Reproduction]]
[[Category:Reproductive System]]
[[Category:Bullet Points]]