Burbot (Lota lota maculosa) are the only true freshwater member of the gadiform (cod-like) fish and are a promising new species for cold water aquaculture. This "freshwater cod" produces a firm white fillet, the liver and roe are considered delicacies, and the skin can be manufactured into leather. Furthermore, burbot grow-out requires the same water quality parameters as trout production, and burbot have been found to be relatively refractory to many salmonid pathogens. Burbot culture can be incorporated into already existing trout production facilities, diversifying production for established cold water aquaculture operations. For commercial burbot culture to succeed, the optimum diet for the grow-out of this species must be determined. Two feeding trials were conducted at the University of Idaho to evaluate the effect of different dietary formulations on the growth of juvenile and sub-adult burbot, under intensive culture. Four dietary treatments were evaluated, Europa (commercial), Oncor (commercial), a formulated marine-like diet (Burbot 1; B1), and a formulated trout-like diet (Burbot 2; B2). Juvenile growth results indicated a difference in relative growth (RG; P=0.001), specific growth rate (SGR; P=0.001), and biomass gain (BG; P=0.001) among the marine blend dietary treatments, with the fish fed B1 and Europa performing better than the B2 and Oncor diets. This is indicative of a preference for marine-type diets during the juvenile life stage of burbot. Growth results also indicate a difference in protein efficiency ratio (PER; P=0.001) among the diets, with the fish fed Europa exhibiting the lowest protein utilization rate. Diet B1 was formulated with small inclusions of soy protein concentrate and wheat, given the close formulation similarities between B1 and Europa it appears that burbot can tolerate small inclusions of these plant products, although the commercial ingredient listing was not available. Sub-adult growth results indicate no differences in RG, SGR, BG. Thus, it appears that the sub-adult burbot are more tolerant of the rainbow trout-like formulation at this life stage While more research is needed, these results indicate that burbot may require a marine-type diet during the juvenile life stage, and could possibly be transitioned onto a trout-like diet at the onset of adulthood.