there are 2 types of DOVER SOLE... Euro kine aka 'common sole' (Solea solea),
and LeftCoast Cal-Wash kine (Microstomus pacificus) aka 'slime sole'
in the USA the NW coast has 'snotfish/slime sole' iow Dover Sole in USA is rubbish fish... slimy snotty stuff ... if you can find USA Dover, you can usually find Petrole Sole... it is the better one, Safeway wise...
fwiw, I did meat/fish @ safeway for 13 yrs 1980-1990s
and Halibut is just a large sole, same w/ Cal Halibut, sand dabs, flounder, etc...
slime sole aka 'dover sole' ...
https://en.wikipedia.org/wiki/Microstomus_pacificus
aloha
more.... Red Snapper on leftcoast is not the same fish as east Coast Red Snapper, its 'rockfish'... and Chilean Seabass is not a bass,... no such thing as fresh Orange Roughy as well, at best it is frozen 2 times as the ships stay at sea for many months at time... the biblical fish, farm raised Tilapia taste as good as the water, not same stuff as the rubbish fish in the Ala Wai Canal.... same w/ catfish and trout, need clean water... aloha
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save our indigenous and endemic Hawaiian Plants... learn about them, grow them, and plant them on your property, ....instead of all that invasive non-native garbage I see in most yards... aloha