the main hunting ground for blue whales is located in the antarctic and sub-antarctic.
the main hunting ground for blue whales is located in the antarctic and sub-antarctic.
where is the main hunting ground for blue whales located?
the antarctic and sub-antarctic
soon, blue whales were being hunted off iceland (1883), the faroe islands (1894), newfoundland (1898), and spitsbergen (1903). in 1904–05 the first blue whales were taken off south georgia. by 1925, with the advent of the stern slipway in factory ships and the use of steam-driven whale catchers, the catch of blue whales, and baleen whales as a whole, in the antarctic and sub-antarctic began to increase dramatically. in the 1930–31 season, these ships caught 29,400 blue whales in the antarctic alone. by the end of world war ii, populations had been significantly depleted, and, in 1946, the first quotas restricting international trade in whales were introduced, but they were ineffective because of the lack of differentiation between species. rare species could be hunted on an equal footing with those found in relative abundance.
blue whale
blue whales may be wounded, sometimes fatally, after colliding with ocean vessels, as well as becoming trapped or entangled in fishing gear. ship strikes in particular have killed many blue whales in california. in september 2007, three dead blue whales washed up in southern california after being killed by ship strikes. a similar incident occurred in northern california in 2017, possibly also 2010. ship strikes are also a serious problem in sri lanka, and scientists believe this problem could be nearly eliminated by moving the shipping lanes 15 nautical miles to the south. the ever-increasing amount of ocean noise, including sonar, drowns out the vocalizations produced by whales, which makes it harder for them to communicate. blue whales stop producing foraging d calls once a mid-frequency sonar is activated, even though the sonar frequency range (1–8 khz) far exceeds their sound production range (25–100 hz). research on blue whales in the southern california bight has shown that mid-frequency sonar use interferes with foraging behavior, sometimes causing the whales to abandon their feeding. human threats to the potential recovery of blue whale populations also include accumulation of polychlorinated biphenyl (pcb) chemicals within the whale's body.
blue whale