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Fish Reproduction

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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  1. Fish Reproduction

  2. Spawning? Egg Maturation Ovulation Spawning

  3. Spawning? Temperature Photoperiod

  4. Temperature

  5. Pineal Gland Photoperiod

  6. Opening for pineal gland

  7. Melatonin: Regulates 24 hr cycle. Also changes skin pigmentation!

  8. Weather

  9. Substrate

  10. Mate Availability & Pheromones

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

  12. 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

  13. How Does the Brain Get the Word Out ?

  14. Brain to Pituitary Gonadotropin Hormone Releasing Hormone GNRH Pituitary

  15. Pituitary to Nads Gonadotropin

  16. Nads to Nads Estrogen Testosterone

  17. Ovary to liver Estrogen Vitellogenin = Yolk

  18. Nads to Elsewhere Testosterone

  19. Secondary Characteristics

  20. Eye Pineal Others... Brain GnRH Pituitary Gonadotropins Ovary Testes Testosterone Estrogen Sperm development, Secondary sexual characteristics, Spawning Behavior

  21. Immature Sperm

  22. Glandular Epithelium

  23. Swordfish sperm packets in various stages of development

  24. Sperm Heads Flagella

  25. Gonopodium

  26. Meanwhile, back in the ovary...

  27. Eye Pineal Others... Brain GnRH Pituitary Gonadotropins Ovary Testes Testosterone Estrogen Secondary Sexual Characteristics, egg development, yolk production (liver), spawning behavior, ovulation

  28. Yolk Shell Follicle

  29. Artificial Spawning Induction

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

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

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

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

  34. GNRH Leutenizing Hormone Releasing Hormone LHRH

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

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