KARYOTYPES AND DISTRIBUTION OF NUCLEOLUS ORGANIZER REGIONS IN CYPRINID FISHES FROM THAILAND

The karyotypes of seven species of cyprinid fishes in Thailand are as follows: Cirrhinus jullieni, 2n=50, NF=90, NORs on 2 acrocentrics; C m rigala, 2n=50, NF=72; Osteochilus waandersi, 2n=50, NF=92, NORs on 2 s ubmetacentrics; Cyclocheilichthys enoplos, 2n=50, NF=90, NORs on 2 sub metacentrics and 2 acrocentrics; Labeo rohita, 2n=50, NF=80, NORs on 2 submetacentrics; Tor soro, 2n=100, NF=144; Puntioplites proctozysron, 2n=50, NF=76. The karyotype of Puntioplites proctozysron, the first r eport for the genus, suggests that P. proctozysron is more closely rel ated to Puntius than to Procypris, Cyprinus, Carassioides, or Carassiu s.