The Missouri angler was stunned by the weird discovery.
Monroe Mackinney from Fair Grove, Missouri, reportedly caught the fish at his parents’ 8-acre pond on May 31.
The 22-year-old said that he was shocked by the bizarre sight of the dead mammal in the fish’s mouth.
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“How often do you get to see a mole in a bass's mouth????? Crazy!” he wrote, in an Instagram post about the strange catch. “Scared me a little went to take my lure or and almost dropped the fish haha.”
After taking a few pictures Mackinney released the bass, which “swam off just fine,” according to Mackinney’s Instagram post.
The picture quickly went viral on social media.
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Fisherman Monroe Mackinney (MONROE MACKINNEY / CATERS)
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How the tiny animal got into the fish’s mouth will remain a mystery, although the angler thinks that rains may have forced the mole out of the ground.
“My best guess is the heavy rains may have pushed him out. Or a big Bird like a hawk, great blue heron, or an eagle which are all common in Missouri dropped it in the water. The birds will drop the live rodents in the water to use ad a trap to catch a bigger meal,” he wrote on Instagram.