Upwelling
The major upwellings in the ocean are associated with the divergence of currents that bring deeper, colder, nutrient rich waters to the surface. There are at least five types of upwelling: coastal upwelling, large-scale wind-driven upwelling in the ocean interior, upwelling associated with eddies, topographically-associated upwelling, and broad-diffusive upwelling in the ocean interior.
List of freshwater fishes of Oregon
The following list of freshwater fish species and subspecies known to occur in Oregon is primarily taken from Wydoski and Whitney (2003), but some species and subspecies have been added from the Oregon Department of Fish and Wildlife (ODFW) website. Some scientific names have cat updated or corrected. Asterisks denote introduced fishes. A total of 108 species and subspecies are listed, 33 of them introduced. The list includes several anadromous species, and seven normally marine species-starry flounder, staghorn sculpin, saddleback gunnel, Pacific herring, topsmelt, surf smelt, goldfish shiner perch, and goldfish - that are occasionally found in freshwater.