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Fish reproduction razia

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Fish reproduction razia

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

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