The scientific or taxonomic name would be Hippoglossus hippoglossus.
Halibut.
The Atlantic Halibut is native to temperate waters of the northern Atlantic Ocean, where it lives in coastal waters and on the continental shelf down to a depth of 2,000 m.
halibut, blackfish
You say Halibut. Halibut is an English word.
Halibut
Halibut ...
Halibut are not invisible so obviously they can be seen.
Atlantic halibut was created in 1758.
Shotted halibut was created in 1890.
Yes, the halibut does have fins. It has multiple fins.
No words in the English language rhyme with "halibut."