I think they are a hybrid of the two, negros and pleiazonas. I'm not to sure, but, Jcardona1 made a thread about pbass in PR and his first post looked to be a negro with 1a bar and 2a bars.
Really nice looking fish...I'm not sure which species these are exactly but I have read that some areas there are stocked with cichla for sport fishing. They did not live there prior to introduction.I'm not sure which species the lakes are stocked with but there is obviously some nice hybridization results in theses photos.