Fish reproduction
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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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Fish Reproduction

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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

&

Pheromones


Mate Availability

Photoperiod

Temp

Weather

Pheromones

Health

Status

Spawning

Substrate

Availability


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


How Does the

Brain Get

the Word Out ?


Brain to Pituitary

Gonadotropin Hormone

Releasing Hormone

GNRH

Pituitary


Pituitary to Nads

Gonadotropin


Nads to Nads

Estrogen

Testosterone


Ovary to liver

Estrogen

Vitellogenin

= Yolk


Nads to Elsewhere

Testosterone


Secondary Characteristics


Eye Pineal Others...

Brain

GnRH

Pituitary

Gonadotropins

Ovary

Testes

Testosterone

Estrogen

Sperm development, Secondary sexual characteristics, Spawning Behavior


Immature

Sperm


Glandular

Epithelium


Swordfish sperm packets in various stages of development


Sperm

Heads

Flagella


Gonopodium


Meanwhile,

back in the

ovary...


Eye Pineal Others...

Brain

GnRH

Pituitary

Gonadotropins

Ovary

Testes

Testosterone

Estrogen

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


Yolk

Shell

Follicle


Artificial

Spawning

Induction


Eye Pineal Others...

Brain

GnRH

Pituitary

Yolk

Protein

Gonadotropins

Ovary

Testes

Estrogen

Testosterone

Liver

Secondary Sexual Characteristics


Eye Pineal Others...

Brain

GnRH

Pituitary

Yolk

Protein

Gonadotropins

Ovary

Testes

Estrogen

Testosterone

Liver

Secondary Sexual Characteristics


Mate Availability

Photoperiod

Temp

Weather

Pheromones

Health

Status

Spawning

Substrate

Availability


Eye Pineal Others...

Brain

GnRH

Pituitary

Yolk

Protein

Gonadotropins

Ovary

Testes

Estrogen

Testosterone

Liver

Secondary Sexual Characteristics


GNRH

Leutenizing Hormone

Releasing Hormone

LHRH


Eye Pineal Others...

Brain

GnRH

Pituitary

Yolk

Protein

Gonadotropins

Ovary

Testes

Estrogen

Testosterone

Liver

Secondary Sexual Characteristics


Dried

Pituitary

Too many hormones !


Gonadotropin


Human Chorionic

Gonadotropin

HCG


Eye Pineal Others...

Brain

GnRH

Pituitary

Yolk

Protein

Gonadotropins

Ovary

Testes

Estrogen

Testosterone

Liver

Secondary Sexual Characteristics


Eye Pineal Others...

Too

Late!

Brain

GnRH

Pituitary

Yolk

Protein

Gonadotropins

Ovary

Testes

Estrogen

Testosterone

Liver

Secondary Sexual Characteristics


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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