Gross energy intake fecal, nitrogen excretory and metabolized energy of snotted halibut juvenile, Eopsetta grigorjewi, fed on Tigriopus iaponicus (Group A) and the enriched Artemia nauplii (Group B), were quantitatively investigated and represented as balance equations of energy and material. Absorption efficiency (AE), gross conversion efficiency $(K_1)$ and net conversion efnciency $(K_2)$ were also estimated to understand the changes in efficiency by the prey Gross energy intake, fecal, nitrogen excretory, metabolized and growth energy of Group A were $2.790pm0.247,;0.495pm0.046,;0.018pm0.003,;0.214pm0.047;cal;mg^{-1};day^{-1}$ and $2.063;cal;mg^{-1};day^{-1},$ respectively. The same parameters of Group B were $4.801pm0.165,;0.579pm0.031,;0.055pm0.010,;0.306pm0.048;cal;mg^{-1};day^{-1}$ and $3.861;cal;mg^{-1};day^{-1},$ respectively. Energy budget of Group A and B were represented as 100 C= 7.67 M+17.7 F+0.65 U+73.94 G and 100C=6.37 M+ 12.1 F+1.15 U+80.42 G, respectively, where C, M, F, U, and G represent gross energy intake, metabolized energy, fecal energy, nitrogen excretory (non-fecal) energy and growth energy, respectively. AEs of Croup A and B were $81.52pm1.89,;86.79pm0.70\%,$ respectively, with significant difference at p=0.01 level. However, $K_1;and K_2$ of Group A and B showed no significant difference at p=0.01 level, with $74.21pm6.57,;80.48pm2.76\%;and;91.17pm7.26,;92.74pm2.69\%$ respectively. These results suggest that T. japonicus is a possible substitute for Artemia nauplii for the snotted halibut juvenile.