抄録
Karyotypes and cellular DNA contents of three species of the family Cottidae viz. Icelus cataphractus, Gymnocanthus intermedius and Alcichthys alcicornis were analyzed. Structural modifications within the family were supposedly by Robertsonian translocations. The diploid chromosome numbers were determined to be 48 in Alcichthys alcicornis, 44 in Gymnocanthus intermedius and 40 in Icelus cataphractus. The DNA contents ranged from 1.46 to 1.50pg/cell in the three species. The karyotype of Icelus cataphractus is unique in having the smallest chromosome number (2n=40) and 14 large-sized chromosomes. From the chromosome number and the existence of some large chromosome pairs, Robertsonian translocations seem to have occurred frequently in Icelus cataphractus and Gymnocanthus intermedius.
