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Fish reproduction razia

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Transcript

  • 1. General Concepts in Fish Reproduction
  • 2. General Considerations
    • Natural habitat of species
    • Body size and first parity
    • Annual vs. multiple spawning
    • Eggs are hardest to produce
    • Hormone treatments
  • 3. Reproductive Strategies
    • Maximize survival of eggs and fry
      • natural habitat vs. man-made
    • Ultimate Factors
      • food supply
      • absence of predators
      • water quality
  • 4. Reproductive Strategies
    • Ultimate Factors
    • Proximate Factors
      • environmental cues
      • anticipate future spawning
  • 5. Day Length and Temperature
  • 6. Reproductive Strategies
    • Synchronous
      • All eggs are spawned and the fish dies
      • (What fish have we seen that fits this?)
  • 7. Reproductive Strategies
    • Synchronous
      • All eggs are spawned and the fish dies
    • Group Synchronous
      • Multiple spawning and seasonal spawners
      • (Any examples?)
  • 8. Reproductive Strategies
    • Synchronous
      • All eggs are spawned and the fish dies
    • Group Synchronous
      • Multiple spawning and seasonal spawners
    • Asynchronous
      • Multiple and daily spawning
      • All oocyte development stages present
  • 9. Stages of Reproduction
    • Stage 1 Oocyte development
      • Gonadotropin independent
      • Body size dependent
  • 10. Stages of Reproduction
    • Stage 1 Oocyte development
    • Stage 2 Vitellogenesis
      • Egg yolk production
      • High nutritional demand
      • Longest phase
  • 11. Stages of Reproduction
    • Stage 1 Oocyte development
    • Stage 2 Vitellogenesis
    • Stage 3 Oocyte maturation
      • Germinal vesicle migration
      • Resumption of meiosis
      • Water uptake
  • 12. Stages of Reproduction
    • Stage 1 Oocyte development
    • Stage 2 Vitellogenesis
    • Stage 3 Oocyte maturation
    • Stage 4 Spawning
      • Optimum environment
      • Mating behaviors
  • 13. Stages of Reproduction
    • Stage 1 Oocyte development
    • Stage 2 Vitellogenesis
    • Stage 3 Oocyte maturation
    • Stage 4 Spawning
    • Stage 5 Recovery
      • Restore body condition
      • New oocyte development
  • 14. Stages of Reproduction
    • Stage 1 Oocyte development
    • Stage 2 Vitellogenesis
    • Stage 3 Oocyte maturation
    • Stage 4 Spawning
    • Stage 5 Recovery
  • 15. Spawning
    • Release of eggs and milt
      • Fertilization
    • Simulate natural environment
    • Dry stripping
    • Hormone induction
  • 16. Spawning
    • Simulate natural environment
      • Milk cans
      • Ammo boxes
      • Floating nests
      • Fiber mats
  • 17. Spawning
    • Dry Stripping
      • Express eggs and milt
      • Mix together
      • Add water
        • Activate eggs and milt
        • closure of micropyle
      • Silting
    • MS222 is toxic to eggs and milt!
  • 18. Spawning
    • Induced Spawning
      • Stage 3 Oocyte maturation
      • Egg Sampling
        • Egg size
        • Yolk clarity
        • Oil globules
  • 19. Spawning
    • Hormone Injection
      • Carp Pituitary Extract
      • Human Chorionic Gonadotropin
    • Single or multiple injection
      • Stage 3 complete in 12 - 48 h
    • Natural Environment or Dry Stripping
  • 20. Conclusions
    • Reproductive strategies are variable
    • Aquaculturist provides proximate and ultimate factors
    • Early stages critical for egg viability
    • Hormone treatments induce egg maturation

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