Black Holes and Dark Matter

In the two very interesting articles on Black Holes (Jan. & Feb. 2017) I miss any reference to their interaction with dark matter. Is it captured by them in the same way as ordinary matter? Is dark matter capable of condensing by its own gravity in the same ways as stars are formed? If that is the case, is there any 'dark pressure' that prevents those condensations ending up in black holes. Maybe most of the dark matter today is in the form of black holes which could be detected only by its effect on light coming from remote sources. In fact, if dark matter is several times more abundant than ordinary matter, most of the mass of the known black holes should come from dark matter.

Eduardo Vila Echag├╝e
Santiago, Chile