彩色海洋动物
所有潜水爱好者都知道,海洋里到处都是色彩绚烂的动物,令人感到吃惊。它们的体色有的形成错综复杂的答案,有的充当一种伪装,有的甚至可以改变透明度。图片展示的是一只白色海葵和一只海星,在加拿大不列颠哥伦比亚省海域拍摄。其他令人着迷的彩色动物还包括小丑鱼、刺蝶鱼和螳螂虾。
Megafishes
Giant freshwater fish from around the world clock in as 2011's most popular environment gallery on nationalgeographic.com. Increasingly rare because of fishing, pollution, and loss of habitat due to human activity, these so-called megafishes can be indicator species of aquatic ecoystems.
National Geographic Explorer Zeb Hogan has wrangled, photographed, and studied many of these freshwater monsters. Some, like the Chinese sturgeon, are "living fossils" that have changed little over millions of years.
Pictured is an arapaima fish at an aquarium in Manaus, Brazil. This South American giant can reach lengths of more than 10 feet (3 meters) and weigh upwards of 400 pounds (180 kilograms).
Like several megafish species in our gallery, the arapaima is the focus of conservation projects, which may be racing against time to save these animals in the wild.
巨型淡水鱼
在2011年美国《国家地理杂志》网站的环境图集中,巨型淡水鱼的照片成为最大热门。由于过度捕捞、环境污染以及人类活动导致的栖息地减少,巨型淡水鱼的数量不断萎缩,它们的命运成为淡水生态系统物种的一个写照。
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