Pictures of White Sturgeon River Monsters -

Larval White Sturgeon 10–11 mm (0. 033–0. 036 ft) in TL experience the highest mortality when they transition from endogenous to exogenous feeding, around 8–14 days post-hatch depending on conditions. Once larval metamorphose into young of the year (YOY) and juveniles, they actively feed on the substrate, dominantly (Corophium) spp. , relying on water currents to carry them downriver to areas of suitable food. The availability of (Corophium) spp. could play a key role in the survival of larval and YOY White Sturgeon in the Columbia River and could possibly explain the apparent poor survival of larvae and YOY in some Snake and Columbia River reservoirs that apparently have successful spawning but poor recruitment. Juveniles less than 600 mm (2. 0 ft) TL are known to feed on tube-dwelling amphipods, mysids, isopods, (Corophium) spp, and other benthic invertebrates, as well as on the eggs and fry of other fish species. Adults greater than 600 mm (2. 0 ft) consume a variety prey species, adjusting to a piscivorous diet of herring, shad, starry flounder, and goby, as well as benthic items such as invasive overbite clam. With feeding movements influenced due to tidal cycles, studies show more active movement at night, hinting that White Sturgeon may be nocturnal foragers.