I claim the ornamental design for a marine anchor fluke, as shown and described.
FIG. 1 is a top perspective view of a marine anchor fluke showing my new design;
FIG. 2 is a top perspective view of the marine anchor fluke of FIG. 1;
FIG. 3 is a front view of the marine anchor fluke of FIG. 1;
FIG. 4 is a bottom perspective view of the marine anchor fluke of FIG. 1;
FIG. 5 is a side view of the marine anchor fluke of FIG. 1;
FIG. 6 is a top view of the marine anchor fluke of FIG. 1;
FIG. 7 is a top perspective view of an alternative embodiment of a marine anchor fluke;
FIG. 8 is a front view of the marine anchor fluke of FIG. 7;
FIG. 9 is a bottom perspective view of the marine anchor fluke of FIG. 7;
FIG. 10 is a side view of the marine anchor fluke of FIG. 7; and,
FIG. 11 is a top view of the marine anchor fluke of FIG. 7.
The spaced broken lines showing other parts of a marine anchor in FIG. 1 are for the purposes of illustrating environment and form no part of the claimed design.