A karyotype study of some teleosts from portonovo waters

1. The present report embodies the results of a study on the karyotypes of 16 teleost species belonging to 15 families and 7 orders,viz., Anguilliformes (1 sp.), Cypriniformes (1 sp.), Siluriformes (1 sp.), Synbranchiformes (1 sp.), Scorpaeniformes (2 spp.), Perciformes (9 spp.) and Tetradontiformes (1 sp.). 2. The diploid chromosome numbers in the 16 species presently studied ranges from 40 to 62. 3. The size of the chromosomes ranges from 0·83 to 5·30µ. 4. No heteromorphic pair or pairs of chromosomes are discernible in any of them: further, a study of the karyotypes in both the sexes ofMystus gulio, Etroplus suratensis, E. maculatus, Mugil cephalus andAnabas testudineus failed to reveal the occurrence of heteromorphism, if any, in them. 5. Based on the available morphological and cytological information, the systematic position and species interrelationships have also been discussed.