Gill nets ARE legal in inland waters, the Ohio River
(2) Gill net or trammel net.
(a) May be used only in Ohio and Mississippi Rivers and overflow lakes directly connected with each river or as specified in 301 KAR 1:140. Minimum mesh size is three (3) inches in the Mississippi and its overflow lakes and four (4) inches in the Ohio River and its overflow lakes.
(b) May be fished weighted or as a flag net.
(c) Shall have one (1) commercial gear tag attached to each 100 feet or part thereof.
That's from their
regulations (click).
As for hoop nets....(a) Shall have a minimum mesh size of three (3) inches, except in the Ohio River, the Mississippi River, those portions of the Cumberland River below Barkley Dam and the Tennessee River below Kentucky Dam that are open to commercial fishing where the minimum mesh size shall be one (1) inch.