COMPARISON OF DNA-SEQUENCES OF EXON-4 OR EXON-5 IN VISUAL PIGMENT GENES BETWEEN AMPHIDROMOUS AND LANDLOCKED AYU-FISH, PLECOGLOSSUS-ALTIVELIS

Nucleotide sequences of exon-4 or -5 encoding one region of visual pig ments in Plecoglossus altivelis were determined with the amplified fra gments. One nuclotide was substituted in the exon-4 of rhodopsin pigme nt gene between the amphidromous and landlocked form, and one codon (A TC) in exon-4 of amphidromous form was changed to GTC in that of landl ocked form. There was no difference in the exon-5 of the sequence in t he red-sensitive pigment gene between the two forms.