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General Concepts in Fish Reproduction

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... development Gonadotropin independent Body size dependent Stages of Reproduction Stage 1 Oocyte development Stage 2 Vitellogenesis Egg yolk production High ... – PowerPoint PPT presentation

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Title: General Concepts in Fish Reproduction


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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