Nope not a lady fish. I know it wasn't a Spanish and almost sure it wasn't a king. It was more round unlike a king or Spanish which are more slender. the markings on it started about 3/4 the way up the sides and on top of the back. the only thing we could come up with was maybe small bonito. looking back at the pic I don't think that's right either.
This is a boston mackerel... note the multiple finlets going to the caudal peduncle
This is a round scad... note just the one finlet on the caudal peduncle
OP's fish is almost definitely a mackerel of some sort because of the several finlets