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Fig. 4. The relative plasma FFA concentration of African catfish infused with saline (filled circles; N=7), isoprenaline (open circles; N=6; 27 µg kg–1) or noradrenaline (triangles; N=5–6; 154 µg kg–1) from t=0 to 1.5 h. *P<0.05 vs initial values; {dagger}P<0.05 vs saline infusion; {ddagger}P<0.05 vs initial values and saline infusion.