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World population graph of blue whales. Whaling decreased substantially after 1946 when, in response to the steep decline in whale populations, the International Whaling Commission placed a moratorium which set a catch limit for each country; this excluded aboriginal groups up until 2004.
There is a population in the waters off Chile that may constitute a fifth subspecies. In general, blue whale populations migrate between their summer feeding areas near the poles and their winter breeding grounds near the tropics. There is also evidence of year-round residencies, and partial or age/sex-based migration.
Year Global population Reference Used Before whaling About 275,000 (Kemf & Phillips 1994) yes 1935 100,000 (Animal World 1972) no 1930s 30,000 - 40,000
The agency has estimated the total number of eastern north Pacific Gray whales to be between 17,400 to 21,300, an increase from an estimated 13,200 to 15,960 whales last year. The population began ...
The agency has estimated the total number of eastern north Pacific Gray whales to be between 17,400 to 21,300, an increase from an estimated 13,200 to 15,960 whales last year. The population began to decline after numbering about 27,000 whales in 2016. The mortality event hits its peak between Dec. 17, 2018, and Dec. 31, 2020, the agency said.
Each year, site leaders are taught, among other things, how to minimize double-counting. ... which matched the estimated growth rate of the North Pacific humpback whale population during that ...
The population of the whale has been increasing at about 2.5 percent per year, but this is below the optimal goal of 6 or 7 percent that researchers were hoping to attain. [ 117 ] There were 411 of these animals left in 2019, when calves were born after a barren 2018. [ 118 ]
A type of whale that is one of the rarest marine mammals in the world lost nearly 10% of its population last year, a group of scientists and ocean life advocates said on Monday. The North Atlantic ...