When a Marlin Ate a 157‑lb Tuna: Secrets from the John R. Manning
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When a Marlin Ate a 157‑lb Tuna: Secrets from the John R. Manning
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The ocean kept a secret for decades: in 1955 a 1,500‑lb marlin swallowed a 157‑lb yellowfin tuna headfirst, still bearing two puncture wounds from the marlin's bill - a single stomach find that finally settled a long scientific debate. What else did the 86‑foot John R. Manning uncover as she mapped unknown waters across the Pacific and changed how fishermen understood tuna behavior?
In this episode, you will hear the story of the US FWS John R. Manning, the purpose‑built research vessel that left Seattle on February 21, 1950, with an 8,000 nautical mile range and instruments like a bathythermograph, and learn how its work raised the catch rate for yellowfin by roughly 40%. How did one wooden ship transform fishery science and resolve questions about billfish predation?
Vessel: US FWS John R. Manning
Departure date: February 21, 1950
Length: 86 feet 6 inches
Engine power: 320 horsepower
Catch rate improvement: ~40%
- In 1955 crew reached into a marlin's stomach and pulled out a 157‑lb yellowfin tuna swallowed headfirst.
- The yellowfin showed two puncture wounds consistent with the marlin's bill.
- Congress authorized the Pacific Ocean Fishery Program in August 1947 to map the living ocean across millions of square miles.
- The Manning was built by Pacific Ocean Company from a June 27, 1949 contract and carried LORAN, a radio direction finder, and a bathythermograph.
- The Manning's brine refrigeration system could hold 30 short tons of tuna and her cruising range was 8,000 nautical miles.
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