1. Diadromous Fish

2. What is Diadromy? From the greek word dromos- running
Fish that migrate between salt and fresh water
Two types
Catadromous- from greek word cat- down, fish run down, migrate to ocean to spawn
Anadromous- fish run up, migrate to the rivers to spawn

3. Life Cycle of Anadromous Fish
Egg
Alevins
Fry
Fingerling (parr)
Smolt
Adult

5. Anadromous Fish Make nests called rudds Nourished by yolk sac
Migration back to ocean is the most dangerous time in life cycle
Dams in rivers sometimes prevent migration back to ocean
Once reach ocean- remain there from 1-6 years
Return to their freshwater birthplaces to give birth to next generation

6. Spawning The return to birthplace called anadromy is harsh
Must swim again currents
Adjust to fresh water
Use up energy and tissue
When journey is complete they stop eating and body begins process of producing roe or milt
Brighter coloration during this time
After spawning many anadromous fish die

8. Types of Anadromous Fish
Salmon
Atlantic
Pacific
Steelhead trout
Striped bass
Shad

10. Catadromous Fish Less common Born in oceans
Females migrate up streams and rivers
Will remain their for up to 15 years
Males remain in ocean or estuaries
Only give birth once

11. American Eel