Fish Reproduction. Spawning? Egg Maturation Ovulation Spawning.
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Transcript of Fish Reproduction. Spawning? Egg Maturation Ovulation Spawning.
Fish Reproductio
n
Spawning?Spawning?
Egg MaturationOvulationSpawning
TemperaturePhotoperiod
Spawning?Spawning?
TemperatureTemperature
Pineal Gland
Photoperiod
Opening for pineal glandOpening for pineal glandOpening for pineal glandOpening for pineal gland
Weather Weather
SubstrateSubstrate
Mate Availability&
Pheromones
Mate Availability&
Pheromones
TempTempPhotoperiodPhotoperiod Mate AvailabilityMate Availability
SpawningSubstrateAvailability
SpawningSubstrateAvailability
HealthStatus
WeatherWeather
PheromonesPheromones
Goldfish Spawning
• Feed broodfish • Move to warm holding tanks• Use lights to lengthen photoperiod• Move to shallow spawning tanks• Add spawning mats• Increase depth to cover mats• Use some old water
Brain to PituitaryGonadotropin
HormoneReleasing Hormone
GNRH
Pituitary
Gonadotropin
Pituitary Pituitary to Nadsto Nads
EstrogenTestosterone
Nads to Nads
Estrogen
Vitellogenin= YolkVitellogenin= Yolk
Ovary to liver
Testosterone
Nads to Elsewhere
Eye Pineal Others...
Brain
Pituitary
Testes
GnRH
Gonadotropins
Testosterone
Ovary
Estrogen
Sperm development, Secondary sexual characteristics, Spawning Behavior
ImmatureSperm
GlandularGlandularEpitheliumEpithelium
Swordfish sperm packets in various stages of development
Sperm Heads
Flagella
Gonopodium
Eye Pineal Others...
Brain
Pituitary
Testes
GnRH
Gonadotropins
Testosterone
Ovary
Estrogen
Secondary Sexual Characteristics, egg development, yolk production (liver), spawning behavior, ovulation
Yolk
Shell
Follicle
Eye Pineal Others...
Brain
Pituitary
Testes
Liver
GnRH
Gonadotropins
Testosterone
Ovary
YolkProtein
Estrogen
Secondary Sexual Characteristics
Eye Pineal Others...
Brain
Pituitary
Testes
Liver
GnRH
Gonadotropins
Testosterone
Ovary
YolkProtein
Estrogen
Secondary Sexual Characteristics
TempTempPhotoperiodPhotoperiod Mate AvailabilityMate Availability
SpawningSubstrateAvailability
SpawningSubstrateAvailability
HealthStatus
WeatherWeather
PheromonesPheromones
Eye Pineal Others...
Brain
Pituitary
Testes
Liver
GnRH
Gonadotropins
Testosterone
Ovary
YolkProtein
Estrogen
Secondary Sexual Characteristics
Leutenizing HormoneReleasing Hormone
LHRH
GNRH
Eye Pineal Others...
Brain
Pituitary
Testes
Liver
GnRH
Gonadotropins
Testosterone
Ovary
YolkProtein
Estrogen
Secondary Sexual Characteristics
DriedPituitary
Too many hormones !
Gonadotropin
Human ChorionicGonadotropin
HCG
Eye Pineal Others...
Brain
Pituitary
Testes
Liver
GnRH
Gonadotropins
Testosterone
Ovary
YolkProtein
Estrogen
Secondary Sexual Characteristics
Eye Pineal Others...
Brain
Pituitary
Testes
Liver
GnRH
Gonadotropins
Testosterone
Ovary
YolkProtein
Estrogen
Secondary Sexual Characteristics
Induced Spawning1. Temp, photoperiod, other cues2. LHRH
1. Replaces GnRH
3. Gonadotropin from dried pituitary1. Clumsy!
4. Human Chorionic Gonadotropin (HCG)
1. Replaces gonadotropin
5. Hormones only finish egg development and spawning
1. Temp, photoperiod, other cues2. LHRH
1. Replaces GnRH
3. Gonadotropin from dried pituitary1. Clumsy!
4. Human Chorionic Gonadotropin (HCG)
1. Replaces gonadotropin
5. Hormones only finish egg development and spawning