The ornamental design for a fishhook, as shown and described.
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FIG. 1 is a left view of the hook with a sting line according to the new design.
FIG. 2 is a perspective view of the hook according to the new design; and,
FIG. 3 is a right view of the hook according to the new design.
All parts of the figures shown in dashed line are not part of the claimed design.