保护蓝鲸等频临灭绝动物具体该怎么办?
发布网友
共4个回答
热心网友
蓝鲸在冬季繁殖，雌兽一般每2年生育一次，怀孕期为10-12个月，每胎只产1仔。刚出生的幼仔体长就达6-8米，体重约为6000千克，为了防止窒息而死，雌兽要将幼仔托出水面呼吸第一口空气，以后它就能自己呼吸了。雌兽的一对乳头长在生殖孔的两侧，哺乳的时候游在海水的上层，幼仔则紧跟在雌兽后方的下面，因为幼仔没有能动的嘴唇，不能自己衔着乳头吮乳汁，雌兽就凭借肌肉的收缩，将乳汁直接喷射到幼仔的嘴里，这也是它对水中主活的一种很好的适应。蓝鲸乳汁中的营养十分丰富，其中脂肪的含量是牛乳的10倍，而幼仔每天吸食的乳汁在1000千克以上，所以发育得很快，8个月以后，可增加到15米，体重增长到23，000千克，可以自己张嘴吃各种浮游生物了。到了2岁半至3岁时，体长即可超过20米。性成熟的年龄约为8一10岁，寿命一般都在50岁以上，最多可以活到90-100岁。
蓝鲸在分类学上隶属于哺乳纲、鲸目、长须鲸科、长须鲸属。由于多年来世界各国在各大海洋中竞相猎捕，现在体长在25米以上的蓝鲸已经很少见了。另外，鳞虾的大量捕捞，也使蓝鲸的觅食活动受到了很大的影响。据统计，半个世纪以前，全世界的蓝鲸大约还有30万只之多，到1974年尚有25000只，而现在仅剩有大约2000只了。尽管自1932年以来，国际上就已经对每年捕杀蓝鲸的数量作了*，但是这种世界上最大动物的前景仍然十分危险。
The Blue Whale (Balaenoptera musculus) is a marine mammal belonging to the suborder of baleen whales. At up to 33 metres (110 ft) in length and 181 metric tonnes (200 short tons) or more in weight, it is believed to be the largest animal to have ever lived on Earth,[2] though some recent, albeit controversial, dinosaur discoveries may contradict this long-held belief (see Bruhathkayosaurus).
Blue Whales were abundant in nearly all oceans around the world until the beginning of the twentieth century. For the first 40 years of the century they were hunted by whalers almost to extinction. Hunting of the species was outlawed by the international community in 1966. A 2002 report estimated there were 5,000 to 12,000 Blue Whales worldwide[3] located in at least five groups. More recent research into the Pygmy subspecies suggest this may be an underestimate.[4] Before whaling the largest population 239,000 (range 202,000 to 311,000) was in the Antarctic[5] but now there remain only much smaller (around 2,000) concentrations in each of the North-East Pacific, the Antarctic, and the Indian Ocean. There are two more groups in the North Atlantic and at least two in the Southern Hemisphere.
热心网友
保护蓝鲸的措施
The World's Forum for Whales
Most people think we saved the whales in 1986 with the worldwide whaling ban. However, more than 30,000 whales have been killed since the ban, many of these because so-called "scientific whaling" is allowed under an international loophole.
Come aboard the Song of the Whale
Read the latest from the crew of our state-of-the-art marine mammal research vessel, concting vital whale research and ecation programs around the world to help save the whales.
Promoting Responsible Whale Watching
From Iceland to the South Pacific, IFAW is helping whale watching of such magnificent creatures as the humpback whale emerge as a major force in global eco-tourism and an alternative to whaling.
Protect Whales from Harmful Ocean Noise
Learn what IFAW is doing to protect whales from deadly human-made ocean noises, such as shipping, oil and gas proction, underwater construction, and military activities.
热心网友
禁止捕鲸，防止石油泄漏，限用农药
热心网友
把日本鬼子捕鲸船消灭掉
