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Methionine (Met) is one of the most limiting essential amino acids in aquafeeds, and different commercial feed‐grade Met sources are available for diet supplementation, namely L‐Met, DL‐Met, and hydroxy‐Met (OH‐Met). In this work, we compared the bioefficacy of OH‐Met and DL‐Met as diet supplements for gilthead seabream (Sparus aurata) juveniles reared at normal (22°C) and high (29°C) water temperatures...