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Southern elephant seals (Mirounga leonina) were harvested for their oil at King Island, Bass Strait, from 1802 to 1819, by which time they were virtually extinct at that location and have not returned since. Oil cargo statistics have been collated from various secondary sources; in arriving at annual yields, allowance was made for untallied (unquantified) cargoes and a certain amount of waste and onsite use. Depending on the methods of calculation, between 920 and 1326 tons of oil were produced, almost 750/0 of this in the first three years and 95% by 1807. Some 10 000 adult and sub-adult elephant seals would have had to be slaughtered to generate such yields. The approximate total size of the pristine populations is believed to have been between about 10 000 and 17000, based on the various calculated oil yields and a number of fairly broad assumptions.

Elephant seal oil cargoes from King Island, Bass Strait, 1802-1819: with estimates of numbers killed and size of the original population