62 Extra: Fish Life Cycles
Pop Quiz!
Can you say ‘potamodromous‘ and can you guess what it means?
- Mood disorder from eating too many potatoes.
- An aquatic dinosaur that crawled across land.
- A migration of fish entirely in freshwater.
- A migration of fish entirely in saltwater.
Answers:
Pronounced it like ‘poe-tuh-moe-droe-miss’
A migration of fish entirely in freshwater.
Many fishes migrate long distances to spawn. In order to better understand these movements, scientists have classified these migrations into several categories.
Anadromous: fish are born in freshwater, then migrate to the ocean as juveniles where they grow into adults before migrating back into freshwater to spawn.
Examples: salmon, smelt, American shad, hickory shad, striped bass, lamprey, gulf sturgeon
Catadromous fish are born in saltwater, then migrate into freshwater as juveniles where they grow into adults before migrating back into the ocean to spawn.
Examples: American eel, European eel, inanga, shortfin eel, longfin eel
Amphidromous fish are born in freshwater/estuaries, then drift into the ocean as larvae before migrating back into freshwater to grow into adults and spawn.
Examples: bigmouth sleeper, mountain mullet, sirajo goby, river goby, torrentfish, Dolly Varden
Potamodromous fish are born in upstream freshwater habitats, then migrate downstream (still in freshwater) as juveniles to grow into adults before migrating back upstream to spawn.
Examples: sicklefin redhorse, lake sturgeon, robust redhorse, flathead catfish
Oceanodromous fish are born near spawning grounds, then drift on ocean currents as larvae before settling as juveniles to grow into adults before migrating back to spawning grounds.
Examples: black grouper, mutton snapper, goliath grouper
Although these different types of migration classifications may be difficult to pronounce, they are important to understand in order to help maintain connectivity between critical habitats.
Anadromous, Catadromous, Amphidromous, Oceanodromous, or Potamodromous
