Why is the Blue Whale an endangered?

From: Orca Network (howard@orcanetwork.org)
Date: Fri May 16 2003 - 23:41:36 EDT

  • Next message: Orca Network: "Experiment"

    Why is the Blue Whale an endangered animal?

    $$$$$ Mark $$$$$

    Even though they are the largest animal on Planet Earth, Blue whales are
    very fast whales. So in the early days of whaling, when the whaling ships
    depended on sail or steam for power, very few blue whales were killed.
    During the 1930's some fast diesel-powered whaling ships were built and
    blue whales began to be killed in large numbers. Then during WWII whaling
    stopped for a while, but after the war, the US actually helped Japan build
    a modern, fast whaling fleet. Norway and several other countries did the
    same, and by the late 1950's tens of thousands of blue whales were killed
    each year, until by the early 1960's they were almost all gone. The only
    way they knew that almost all the blue whales had been killed was a
    measurement called "catch per unit of effort" or CPU. In other words, when
    they couldn't find any more, they figured they must have killed nearly all
    of them. Blue whales don't reproduce very fast, so it's possible that they
    haven't increased their numbers much since the 1960's. That's why they are
    considered endangered.

    Howard Garrett
    Orca Network
    Greenbank WA
    (360) 678-3451
    www.orcanetwork.org
    howard@orcanetwork.org



    This archive was generated by hypermail 2b30 : Sun May 18 2003 - 10:58:40 EDT