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 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 consume a variety prey species, adjusting to a piscivorous diet of herring, shad, starry flounder, goby, smelt, anchovy, lamprey, and salmon, 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. Studies have shown that dietary lipid requirements on larval white sturgeon effect overall body composition, plasma biochemical parameters and liver fatty acids. With increasing dietary lipid levels, whole body and muscle lipid content increases, as well as increased plasma triglycerides and cholesterol content. This shows that larval sturgeon post-hatch grow faster on high lipid diets, reducing glycogen stores but increasing stores of lipid in the liver. The importance of this can help to understand growth rates in changing environments with varying food sources. Reproduction "White sturgeons are iteroparous breeders with a spawning period in the Sacramento and San Joaquin Rivers between mid-February to late May, with peak activity during March and April" - Kohlhorst 1976. There is much uncertainty around reproduction timing of events in white sturgeon, with many papers reporting differing results dependent on the river system observed. Chapman, Van Enennaam and Doroshov witnessed sexually mature females FL in the Sacramento-San Joaquin River system estimated around 9 years old by using the Von Bertalannfy growth function, while the youngest sexual mature was a male FL estimated to be six years old. However, other reports have sexual maturity for white sturgeon at 12 and 10 years old for females and males. Uncertainty around age estimates from fin ray annulus may account for any disparity. Spawning periodicity is thought to be 2 to 4 years for females and 1 to 2 years for males. Behavior during spawning is not well known, but it is known that they are communal broadcast spawners, where a female's eggs are fertilized by many males. When ready to spawn, white sturgeon choose a variety of substrates dependent on the river system, spawning on gravel or rocky substrate in moderate to