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Fig. 1. Schematic drawing of trout instrumented with (a) occlusion catheter in
dorsal aorta (Da), positioned distal to celiacomesenteric artery (CMa); (b)
catheter in sinus venosus (Sv); (c) percutaneous ECG-electrodes and (d)
occlusion probe around ventral aorta (Va). A cross-section of the ventral
aortic probe is magnified to illustrate (i) PE-50 catheter connected to
latex-balloon; (ii) inflatable latex-balloon and (iii) doppler crystal with
lead.