SHARK VS SHARK

Pacific sleeper sharkvsShortfin mako

Length, weight and bite evidence—plus context from a human, city bus and blue whale. Every number below carries its uncertainty with it.

LivingSomniosus pacificus×LivingIsurus oxyrinchus
QUICK VERDICT

Pacific sleeper shark is about 1.57× longer by these reference values.

Pacific sleeper shark uses a 7 m upper reference, compared with 4.45 m for Shortfin mako. Pacific sleeper shark's weight reference is about 1.59× heavier.

01

ON THE SAME SCALE

Human. Bus. Whale.
Pick your reference.

RELATIVE LENGTH · 0–24 METERS
APacific sleeper sharkreported near 7 m / 23 ft
BShortfin makoreported to about 4.45 m / 14.6 ft
REFAdult human1.8 m · about 80 kg

Length bars use upper comparison values and do not show body depth, tail proportion or typical adult size. A long thresher tail, for example, does not equal whale-shark body mass.

02

THE NUMBERS

Side by side.

MeasurePacific sleeper sharkShortfin mako
Length referencereported near 7 m / 23 ftreported to about 4.45 m / 14.6 ft
Weight referencelarge-animal estimate about 907 kg / 2,000 lbrecorded to about 570 kg / 1,257 lb
Bite forceNo dependable maximum foundUnknownNo dependable maximum foundUnknown
HabitatCold North Pacific, often deepOpen tropical and temperate oceans
DietFishes, squid, marine mammals and carrionFast fishes, squid and other sharks
03

WHAT THE DATA CAN SAY

Size is not the whole animal.

Length and weight

Pacific sleeper shark is represented by reported near 7 m / 23 ft; Shortfin mako by reported to about 4.45 m / 14.6 ft. Large values often depend on indirect or incomplete records. Record length and mass do not necessarily describe the same individual.

Bite evidence

Pacific sleeper shark: No standardized maximum is available. Shortfin mako: No directly comparable maximum bite-force estimate is used.

Living versus extinct

Both species are living, but record-sized individuals are rare. These upper references should not be read as normal adult size.

Ecology changes the matchup

Rare encounters make its maximum size less certain than familiar coastal species. Speed is its signature; the biggest animals are unusual and hard to verify.

04

TRACE THE CLAIMS

Sources and limits.

Pacific sleeper sharkAlaska Department of Fish and GameShortfin makoFlorida MuseumHow we standardize comparisonsRead the methodology →