Collisions of two degenerate quark Fermi liquids are studied. It is sh
own that there arise instabilities, which manifest themselves in propa
gation of growing oscillations corresponding to the modes existing in
a Fermi liquid at rest. Quark jets are likely to appear in the directi
ons of the growing oscillations propagation. The instabilities studied
in this work are similar to the beam instability in ordinary electron
plasma.