Ag‐staining pattern, FISH and ISH with rDNA probes in the rice field eel ( Monopterus albus Zuiew) chromosomes

The present paper reports the Results of rice field eel ( Monopterus albus Zuiew) chromosomal analysis by Ag‐staining techniques, FISH and ISH with 18S rDNA. Both the Ag‐NORs and the hybridization signals were observed on the pericentromeric region of chromosome pairs 3 and 7. The Ag‐NORs and the hybridization signals on homologous chromosomes 3 and 7 were corresponding to each other. And rDNA genes were mapped to bivalents 3q12‐q24 and 7q14‐q26. No heteromorphic sex chromosome pair was identified. The Results obtained were discussed with respect to the feature of Ag‐NORs and the position of rDNA genes on chromosome pairs 3 and 7.