“…Although field peas ( Pisum sativum ) have been found to be a promising protein source for several species, such as Atlantic salmon (Aslaksen et al 2007; Øverland et al 2009), rainbow trout (Thiessen et al 2003), sea bass (Gouveia & Davies 1998), and sea bream (Sánchez-Lozano et al 2011), its effectiveness must be related to fish size and species, dietary inclusion levels, dietary fish meal content, or raw material processing conditions. For instance, including 10% untreated pea meal or 20% pea protein isolate in diets for juvenile milkfish ( C. chanos ) (Borlongan et al 2003) or tilapia ( O. niloticus ) (Schulz et al 2007) negatively affected fish performance, whereas up to 40% whole pea meal (Gouveia & Davies 1998) or up to 30% extruded pea meal (Gouveia & Davies 2000) has been successfully included in sea bass diets and up to 37% extruded pea meal (Pereira & Oliva-Teles 2002) or 32% pea protein concentrate in extruded diets (Sánchez-Lozano et al 2011) in gilthead sea bream. In the present study, 15% pea protein concentrate tended to reduce growth performance of sea bream, whereas in previous studies conducted in the same species (Sánchez-Lozano et al 2011), with the same pea protein concentrate and under similar fish size and temperature conditions, it did not affect growth.…”