The scutes also tend to be sharper and more pointed than in white sturgeon. Speculation exists that reported sightings may be an undocumented population of white sturgeon. Porter has been active in efforts to save the Kootenai River white sturgeon. The Bonneville Dam blocked the migration of white sturgeon to their upstream spawning areas. A typical white sturgeon catch can average about . Aquaculture facilities cultivate White Sturgeon in California and juveniles can be sold to aquarist. All migration and foraging during the migration period is nocturnal, unlike white sturgeon. Small, very depressed populations of white sturgeon persist in the various reservoirs upstream. White sturgeon are the largest freshwater fish in the United States. This season featured the white sturgeon, Wade's second largest catch. In coastal British Columbia, Fraser River white sturgeon are sustainably farmed to produce caviar. The White Sturgeon is considered a bottom-feeder and rummages the sea floor for food.