1. Fish Reproduction

2. Reproductive Systems Cartilaginous Fishes Bony & Jawless Fishes
Ducts lead from testes and ovaries to cloaca (common passage for digestive, excretory and reproductive systems)
Cloaca leads to the anus
Bony & Jawless Fishes
Have a urogential opening (separate opening behind the anus for urine and gametes)

3. Reproductive System – Cartilaginous Fish

4. Reproductive System – Bony Fish

5. Hermaphrodites Some fish are hermaphrodites
Deep water fish
Able to fertilize themselves but usually don’t
Sequential Hermaphroditism (a.k.a. Sex reversal) – individuals begin life as one sex but change into the opposite sex
Controlled by sex hormones; triggered by social cues
Protandry - starts as male and changes to female
Example: Clownfish
Protogyny - starts as female and changes to male
Example: Wrasses

6. Sequential Hermaphroditism

7. Reproductive Behavior
Adaptations help individuals get together:
Migrations
Displaying particular colors as sex signals
Courtship behavior
Dances
Postures
Nest building

8. Mating: Release of Gametes
Cartilaginous fishes: Copulation (internal fertilization)
Claspers used to deliver sperm into female cloaca
Male sharks usually bite and hold female
Bony fish: spawn (external fertilization)
Spawning can occur in pairs or in large groups
Eggs fertilized in the water column drift as plankton
Some species deposit eggs on rocks or grass
Some are laid in nests and are guarded

9. Time of spawning is critical Spawning controlled by sex hormones Environmental factors trigger production of sex hormones: Daylight Temperature Food
Spawning
Time of spawning is critical
Spawning controlled by sex hormones
Environmental factors trigger production of sex hormones:
Daylight
Temperature
Food

10. Early Development of Bony Fish
After a few days of embryo development the eggs hatch into larva (fry)
Larva live as plankton
Larva develops into juvenile
Juvenile develops into an adult

11. Early Development of Cartilaginous Fishes

12. Oviparous – Deepsea Cat Shark

13. Ovoviviparous – Portuguese Shark

14. Viviparous - Hammerheads

15. “Low Oxygen in Coastal Waters Impairs Fish Reproduction”
Atlantic Croaker

16. Assignment: Write a short Essay:
Use evidence from this article to support your statements
Your essay needs to include:
Explain how humans are impacting the Atlantic Croaker.
Discuss the long term effects of the human impacts
Suggest some ways to help the Croakers

17. Backdrops: - These are full sized backdrops, just scale them up!
- Can be Copy-Pasted out of Templates for use anywhere!