I claim the ornamental design for a fishing rod holder, as shown and described.
FIG. 1 is a front and side perspective view of the fishing rod holder showing my new design shown installed on a bicycle seat support.
FIG. 2 is a rear and opposite side perspective view of thereof shown installed on a bicycle seat support and with a fishing rod in the holder; and,
FIG. 3 is a detail of the fishing rod holder for bicycle of FIG. 1, in the direction of line A—A in FIG. 1.
The broken lines showing a bicycle seat in FIG. 1 and a bicycle seat and fishing rod in FIG. 2 illustrate environmental elements that form no part of the claim.