Sole & Flounder populations are not considered depleted, but the common method of catch is bottom trawling - which has significant bycatch and habitat degradation concerns. Dover Sole populations off the west coast of the US are healthy and no overfishing is occurring. Information on population levels in the North Pacific is not currently available.
Fishy Fact: Dover Sole are sometimes called “Slime Sole” by fishermen? This is because they produce profuse amounts of slime on their skin when they are brought onboard.