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.
Donnelly River (Western Australia)
The Donnelly is one of the few catchments left in the state that contains all of the region's endemic freshwater fishes. Native freshwater species include salamanderfish ("Lepidogalaxias salamandroides"), freshwater cobbler ("Tandanus bostocki"), western minnow ("Galaxias occidentalis"), western mud minnow ("Galaxiella munda"), black-stripe minnow ("Galaxiella nigrostriata"), western pygmy perch ("Nannoperca vittata"), Balston's pygmy perch ("Nannatherina balstoni"), nightfish ("Bostockia porosa"), and pouched lamprey ("Geotria australis").
Many estuarine fish are found close to the mouth of the river, these include black bream ("Acanthopagrus butcheri"), flathead mullet ("Mugil cephalus"), yellow-eye mullet ("Aldrichetta forsteri"), Australian herring ("Arripis georgianus"), and freshwater cobbler ("Tandanus bostocki").