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Gly-SIFamide injection into BCs. Effect on the mean dominance index (DI) before (pre) and after (post) injection of the BCs with 1 × 10−3 mol l−1 Gly-SIFamide (n = 5). When the BCs were injected, they further increased their aggression toward YCs when compared to control conditions (asterisk [*] over the BC post-injection group, P ≤ 0.001). BC: blue clawed prawns; YC: yellow clawed prawns; filled bar indicates the mean DI of the injected (BC) prawns; *P ≤ 0.001.
