Fig. 2. Representative original recordings during ventral aortic occlusion in a resting 530 g sea bass (Dicentrarchus labrax). Before (left-hand panel) and 1.5-2 h after (right-hand panels) prazosin treatment (1 mg kg^-1 M_b). (A) Dorsal aortic pressure (PDA); (B) central venous pressure (PCV); (C) relative cardiac output in kHz (); and (D) heart rate (fH). Mean circulatory filling pressure (MCFP) was calculated from the average venous plateau pressure between the 5th and 7th seconds during the ventral aortic occlusion.