Fish Reproduction. Spawning? Egg Maturation Ovulation Spawning.

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Presentation transcript:

Fish Reproduction

Spawning? Egg Maturation Ovulation Spawning

Temperature Photoperiod Spawning?

Temperature

Pineal Gland Photoperiod

Opening for pineal gland

Weather

Substrate

Mate Availability & Pheromones Mate Availability & Pheromones

Temp Photoperiod Mate Availability Spawning Substrate Availability Spawning Substrate Availability Health Status Weather Pheromones

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 Pituitary Gonadotropin Hormone Releasing Hormone GNRH Pituitary

Gonadotropin Pituitary to Nads

Estrogen Testosterone Nads to Nads

Estrogen Vitellogenin = Yolk Vitellogenin = 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

Immature Sperm

GlandularEpithelium

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 Yolk Protein Estrogen Secondary Sexual Characteristics

Eye Pineal Others... Brain Pituitary Testes Liver GnRH Gonadotropins Testosterone Ovary Yolk Protein Estrogen Secondary Sexual Characteristics

Temp Photoperiod Mate Availability Spawning Substrate Availability Spawning Substrate Availability Health Status Weather Pheromones

Eye Pineal Others... Brain Pituitary Testes Liver GnRH Gonadotropins Testosterone Ovary Yolk Protein Estrogen Secondary Sexual Characteristics

Leutenizing Hormone Releasing Hormone LHRH GNRH

Eye Pineal Others... Brain Pituitary Testes Liver GnRH Gonadotropins Testosterone Ovary Yolk Protein Estrogen Secondary Sexual Characteristics

Dried Pituitary Too many hormones !

Gonadotropin

Human Chorionic Gonadotropin HCG

Eye Pineal Others... Brain Pituitary Testes Liver GnRH Gonadotropins Testosterone Ovary Yolk Protein Estrogen Secondary Sexual Characteristics

Eye Pineal Others... Brain Pituitary Testes Liver GnRH Gonadotropins Testosterone Ovary Yolk Protein Estrogen Secondary Sexual Characteristics

Induced Spawning 1.Temp, photoperiod, other cues 2.LHRH 1.Replaces GnRH 3.Gonadotropin from dried pituitary 1.Clumsy! 4.Human Chorionic Gonadotropin (HCG) 1.Replaces gonadotropin 5.Hormones only finish egg development and spawning 1.Temp, photoperiod, other cues 2.LHRH 1.Replaces GnRH 3.Gonadotropin from dried pituitary 1.Clumsy! 4.Human Chorionic Gonadotropin (HCG) 1.Replaces gonadotropin 5.Hormones only finish egg development and spawning

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