Contrary to what many believe, codfish do have scales.
Like with the consumption of bottom feeders, some people avoid the consumption of fish without scales due to their religious beliefs. For example, some Jews follow biblical dietary cods that require that all fish that are eaten have fins and scales. Finless fish without scales are not considered “kosher” or acceptable for consumption by their religion.
There are certainly more kosher fish out there than there are non-kosher fish, or fish without scales but among these are anglers, blowfish, catfish, eels, marlin, and swordfish. The consumption of codfish is therefore considered kosher by Jewish dietary standards.