I claim the ornamental design for fish bait, as shown and described.
FIG. 1 is a left side elevation view of the crayfish bait design with articulated tail;
FIG. 2 is a top plan view thereof;
FIG. 3 is a left and rear perspective view thereof; and,
FIG. 4 is a left and front perspective view thereof.
The broken lines in the drawings depict parts of the portion of fish bait design that are not part of the claim. The broken lines and the structures and features they depict form no part of the claimed design.