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Fish Reproduction. Spawning?. Egg Maturation Ovulation Spawning. Spawning?. Temperature. Photoperiod. Temperature. Pineal Gland. Photoperiod. Opening for pineal gland. Melatonin:. Regulates 24 hr cycle. Also changes skin pigmentation!. Weather. Substrate. Mate Availability &

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slide3

Spawning?

Egg Maturation

Ovulation

Spawning

slide4

Spawning?

Temperature

Photoperiod

slide6

Pineal Gland

Photoperiod

slide8

Melatonin:

Regulates 24 hr cycle.

Also changes skin pigmentation!

slide18

Mate Availability

Photoperiod

Temp

Weather

Pheromones

Health

Status

Spawning

Substrate

Availability

goldfish spawning
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
slide20

How Does the

Brain Get

the Word Out ?

slide21

Brain to Pituitary

Gonadotropin Hormone

Releasing Hormone

GNRH

Pituitary

slide22

Pituitary to Nads

Gonadotropin

slide23

Nads to Nads

Estrogen

Testosterone

slide24

Ovary to liver

Estrogen

Vitellogenin

= Yolk

slide25

Nads to Elsewhere

Testosterone

slide32

Eye Pineal Others...

Brain

GnRH

Pituitary

Gonadotropins

Ovary

Testes

Testosterone

Estrogen

Sperm development, Secondary sexual characteristics, Spawning Behavior

slide34

Glandular

Epithelium

slide36

Sperm

Heads

Flagella

slide40

Meanwhile,

back in the

ovary...

slide41

Eye Pineal Others...

Brain

GnRH

Pituitary

Gonadotropins

Ovary

Testes

Testosterone

Estrogen

Secondary Sexual Characteristics, egg development, yolk production (liver), spawning behavior, ovulation

slide43

Yolk

Shell

Follicle

slide44

Artificial

Spawning

Induction

slide45

Eye Pineal Others...

Brain

GnRH

Pituitary

Yolk

Protein

Gonadotropins

Ovary

Testes

Estrogen

Testosterone

Liver

Secondary Sexual Characteristics

slide46

Eye Pineal Others...

Brain

GnRH

Pituitary

Yolk

Protein

Gonadotropins

Ovary

Testes

Estrogen

Testosterone

Liver

Secondary Sexual Characteristics

slide47

Mate Availability

Photoperiod

Temp

Weather

Pheromones

Health

Status

Spawning

Substrate

Availability

slide48

Eye Pineal Others...

Brain

GnRH

Pituitary

Yolk

Protein

Gonadotropins

Ovary

Testes

Estrogen

Testosterone

Liver

Secondary Sexual Characteristics

slide49

GNRH

Leutenizing Hormone

Releasing Hormone

LHRH

slide50

Eye Pineal Others...

Brain

GnRH

Pituitary

Yolk

Protein

Gonadotropins

Ovary

Testes

Estrogen

Testosterone

Liver

Secondary Sexual Characteristics

slide51

Dried

Pituitary

Too many hormones !

slide53

Human Chorionic

Gonadotropin

HCG

slide54

Eye Pineal Others...

Brain

GnRH

Pituitary

Yolk

Protein

Gonadotropins

Ovary

Testes

Estrogen

Testosterone

Liver

Secondary Sexual Characteristics

slide55

Eye Pineal Others...

Too

Late!

Brain

GnRH

Pituitary

Yolk

Protein

Gonadotropins

Ovary

Testes

Estrogen

Testosterone

Liver

Secondary Sexual Characteristics

induced spawning
Induced Spawning
  • Temp, photoperiod, other cues
  • LHRH
    • Replaces GnRH
  • Gonadotropin from dried pituitary
    • Clumsy!
  • Human Chorionic Gonadotropin (HCG)
    • Replaces gonadotropin
  • Hormones only finish egg development and spawning
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