  We present high field magnetoresistance, Hall effect and thermopower
measurements in the Ising-type ferromagnetic superconductor UCoGe. Magnetic
field is applied along the easy magnetization $c$ axis of the orthorhombic
crystal. In the different experimental probes we observed five successive
anomalies at $H \approx 4$, 9, 12, 16, and 21~T. Magnetic quantum oscillations
were detected both in resistivity and thermoelectric power. At most of the
anomalies, significant changes of the oscillation frequencies and the effective
masses have been observed indicating successive Fermi surface instabilities
induced by the strong magnetic polarization under magnetic field.
