By Patrick Cooney
Can you say ‘potamodromous‘ and can you guess what it means?
If you pronounced it like ‘poe-tuh-moe-droe-miss’, then you are off to a great start. But what about the meaning? For such a strange word, it simply signifies option C, 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
Examples: American eel, European eel, inanga, shortfin eel, longfin eel
Examples: bigmouth sleeper, mountain mullet, sirajo goby, river goby, torrentfish, Dolly Varden
Examples: sicklefin redhorse, lake sturgeon, robust redhorse, flathead catfish
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.
Considering that many of these fishes use rivers as migration corridors:
1) What impacts might you expect dams to have on the ability of fish to get from one location to another?
2) Might impacts to riverine ecosystems propagate impacts on oceanic ecosystems, and vice versa?
Also check out last week’s post about why fish need floods.