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Fish Life Cycle & Reproduction.pptx
- 1. Fish Life Cycle & Reproduction
- 2. Fish Life Cycle (Varies greatly by species) Egg 4-12 days depending water temperature Fry Newly hatched egg up to an inch long Sac Fry Yolk sac attached Fingerling 1-6 inches in length
- 3. Fish Life Cycle (Varies greatly by species) Stockers Ready to stock in lakes or streams Foodfish Ready for fillets Broodfish Used for reproduction
- 4. Aging Fish Look for rings on scales
- 5. Aging Fish
- 6. Fish Reproduction Roe/Egg Cell Produced by the female Contains yolk which is embryo’s food supply Milt Sperm Fertilization Union of egg and sperm Zygote Fertilized egg
- 7. Fish Mating Courtship Female spawns Releases eggs Male releases the milt over the eggs Fertilizations occurs
- 8. Controlling Reproduction Genetic Select broodfish for specific traits Environmental Amount of day length can affect spawning Water temperature Can affect spawning Can affect sex
- 9. Controlling Reproduction Hormones Induces or delays spawning Changes sex Monosex production Raise only one sex of fish
- 10. Artificial Reproduction Eggs stripped from female into a pan Milt stripped from male onto the eggs Eggs and milt mixed together Fertilized eggs incubated
- 11. Spawning & Fertilization Videos Kokanee Egg Collection 10-08-09 (7 min 52 seconds) Shocking stream Egg Collection Salmon River Fish Hatchery Egg Take 2008 (10 minutes) Skip the first minute River Lift into processing plant Sorting Egg removal Fertilizing Alaska…Crooked Creek Salmon Egg Fertilization (43 seconds) Egg removal Fertilizing Salmon Spawning on the Prairie (6 min 24 seconds) Artificial spawning in a land-locked lake Great explanation of the process