"Cytogenetic studies were conducted on Pygocentrus caribafrom Caicara del Orinoco, Venezuela. The diploid chromosomenumber 2n=60 consisted of 18 metacentric, 30 submetacentric, 2subtelocentric and 10 acrocentric chromosomes (NF= 110). Amaximum of 12 nucleolar organizer regions (NOR) bearing chromoso...