we found that in the crab, practically there are no limiting AA ((Crab Arg / octopus Arg) × 100 = 158%), while in the squid, Arg appears as the limiting AA for O. maya ((Squid Arg / octopus Arg) × 100 = 16%). That condition was almost reversed when crab and squid were mixed, reaching values close to 87%. According to these results, we can now explain why jumbo squid alone as a diet for O. maya provokes marginal growth rates ( Rosas et al., 2013; present study), and when it is mixed, with crab, provokes even better results than when only crab is used alone as a food.