USS Gudgeon (SS-567)
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USS Gudgeon (SS/AGSS/SSAG-567), a Tang-class submarine, was the second ship of the United States Navy to be named for the gudgeon, a species of small fresh-water minnow.
USS Gudgeon underway, c. 1970s (the three distinctive shark-fin-like domes are the PUFFS sonar, one just aft of the sail, below the flag).