Abstract
Cephalopods offer a unique model for studying animal nutrition due to the predominance of their amino acid metabolism. Since cephalopods grow at rapid rates for most of their life cycle (3–10% body weight d‐1), the demands on protein synthesis are high. As a result, cephalopod body composition ranges between 75–85% protein on a dry weight basis and they are efficient at assimilating proteins (apparent protein digestibility >85%). Furthermore, the protein/energy ratio required for optimum growth (>50 g protein MJ energy‐1) appears to be significantly greater than for other aquatic invertebrates or fishes (20–30 g protein MJ energy‐1). This high protein/energy ratio indicates that protein should not be considered separately from energy in cephalopods. Attempts to supply high levels of protein (>35% of diet on a wet weight basis) to cuttlefishes with moist prepared diets (pellets and surimi) have been successful in terms of palatability (feeding rates ≈ 8% body weight d‐1) but growth rates (0.7–1.0% body wei...
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