The radical fish and the kanji fish are exactly the same!
You catch a fish. As you pull it out of the water, it starts yelling and pointing: "GO!" (ぎょ). "GO GYO GYO GYO!" There's a huge cruise ship coming right towards your little fishing boat. No wonder the fish was yelling GO at you.
Currently there are no similar looking kanji which exist in the WaniKani learning system