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As has been demonstrated in previous studies, Octopus maya can be fed on artificial diets. In the present study six different diets were assayed. Five diets were designed to test the effect of percentage of inclusion of fish protein concentrate (CPSP: 0, 5, 10, 15, and 20%) and were offered to octopuses as a specifically designed artificial diet. The sixth diet consisted of frozen crab (Callinectes spp) and was used as control diet. Blood metabolites and energy budget of octopuses were evaluated to determine how CPSP levels modulate the digestive capacity and allow retaining energy for growth. Wild animals (316.4±9.8 g) were used in the study. Results showed that CPSP produced a positive specific growth rate (SGR, % day⁻¹) with high value in octopuses fed 15% CPSP level. A maximum growth rate of 0.86% day⁻¹ was recorded in these animals, a value that is extremely low when compared with the SGR obtained …