Sailfish
#1 · Istiophorus platypterus · muscle estimate
Fish & Sharks
Watanabe and colleagues 2019 estimated 15.0 mph (6.7 m/s) from tailbeat frequency during a filmed seal chase. The propeller stalled, so this is not a speedometer reading.
A great white shark can swim about 15.0 mph (6.7 m/s), an estimate.
Top speed
Published as 6.7 m/sPublished as 6.7 m/sPublished as 6.7 m/s
Watanabe et al. 2019, Marine Ecology Progress Series. One filmed seal chase: lateral acceleration 3.7 g, tailbeat 3.3 Hz, estimated swim speed 15.0 mph (6.7 m/s), duration 19 s, depth 0 feet (0 m), upward. The propeller stalled and the speed was estimated from tailbeat frequency. The figure is 15.0 mph (6.7 m/s), qualifier estimated. Waller et al. 2023 Table 4 reprints 15.0 mph (6.70 m/s) and labels the method a speedometer. The primary paper's estimate is the one that counts.
In context
Worked out from the sourced figure above, which stays the ranked number.
Quick answers
A great white shark can swim about 15.0 mph (6.7 m/s), an estimate.
Great white shark is labeled Estimated. Calculated or approximated rather than directly timed.
The figure cites Marine Ecology Progress Series, “Hunting behaviour of white sharks recorded by animal-borne video and accelerometers.”
Great white shark is 2nd of 10 on Fastest Fish & Sharks.
Mechanism
Watanabe and colleagues in 2019 estimated about 15.0 mph (6.7 m/s) for a white shark, Carcharodon carcharias, from tailbeat frequency during a filmed seal chase. The propeller stalled, so this is not a speedometer reading.
The speedometer on the tag did not finish the job. The 15.0 mph (6.7 m/s) figure is estimated from how fast the tail was beating while the shark chased a seal on film. It is better than a campfire number and weaker than Waller's logged mako burst.
A seal chase has turns. The 15.0 mph (6.7 m/s) estimate belongs to that hunt. It is not a measured top speed in a straight line, and the entry says the propeller stalled so nobody pretends it is.
Provenance
Claimed, measured and official figures side by side, each with its source. The ranked figure is marked.
Watanabe et al. 2019, Marine Ecology Progress Series. One filmed seal chase: lateral acceleration 3.7 g, tailbeat 3.3 Hz, estimated swim speed 15.0 mph (6.7 m/s), duration 19 s, depth 0 feet (0 m), upward. The propeller stalled and the speed was estimated from tailbeat frequency. The figure is 15.0 mph (6.7 m/s), qualifier estimated. Waller et al. 2023 Table 4 reprints 15.0 mph (6.70 m/s) and labels the method a speedometer. The primary paper's estimate is the one that counts.
Waller's speedometer label disagrees with the primary paper. The rank follows Watanabe and stays estimated. A higher tailbeat with no speed estimate is not a separate figure.
Reference
Context
Watanabe and colleagues, Marine Ecology Progress Series 2019, filmed one white shark attacking a seal. During that event the propeller speed sensor stalled. They estimated swim speed from tailbeat frequency: 15.0 mph (6.7 m/s), with a tailbeat of 3.3 Hz, held about 19 seconds. The paper calls 15.0 mph (6.7 m/s) a conservative estimate of top speed. The figure is 15.0 mph (6.7 m/s), qualifier estimated.
Waller and colleagues 2023 reprint the cell as 15.0 mph (6.70 m/s) and put Speedometer in the method column. That label is not how the primary paper describes the number, so it does not change the qualifier. A caged juvenile tuna is a different experiment and is not this row.
Head to head
1.2× slower29.9km/h18.6mph8.3m/s16.1kn
Great white shark vs Barracuda
8% faster22.3km/h13.9mph6.2m/s12.1kn
Great white shark vs Little tunny
1.2× faster20.2km/h12.5mph5.6m/s10.9kn
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