眼鏡斑豚

詳細信息

個體大小

成年雄性身長至少2.3米，成年雌性大約2.1米，新生幼體大約1米長。

種群分布

從南美洲東部，從烏拉圭到火地島的南部海岸。同樣也在南半球的離岸群島附近。在福克蘭群島、南喬治亞島、凱爾蓋朗群島、赫德島、麥夸里島和奧克蘭群島的發現記錄。在海上很少被發現，從這一點課件其可能是在北極圈。目擊事件發生於離岸水域，以及在河流和渠道。

生物學及行為

In the few known sightings, group sizes were small, apparently mostly singles and pairs. These animals are very inconspicuous when surfacing. Births appear to occur in the southern spring to summer. Essentially, nothing else is known of this species' behaviour and biology.

利用價值

In the past, spectacled porpoises were killed deliberately for food. In Argentina and Chile, spectacled porpoises are taken in gillnets, and they may be taken deliberately for crab bait off southern Chile. The effects of these catches on spectacled porpoise populations are not known.

IUCN等級

Insufficiently known.

生活習性

眼鏡斑豚體型基本一樣。但一些成年雄豚背鰭大而圓。鰭狀肢小，圓形的邊緣。喙短或根本不存在。眼鏡斑豚的兩種顏色的模式很獨特。一部分白色在側線以下的部分，一半在眼睛所在水平線以上（除該行向上延伸的尾部），有黑色的嘴唇異常和黑暗的裂口鰭條（後者顯然沒有出現在所有的成年豚身上）。有一個黑色的斑塊，眼睛周圍有細白線。鰭的顏色可變，無論是全黑部分還是灰白色與灰色的邊緣。年輕的個體有柔和的灰色色彩。口腔內鏟形齒數目為17至23（上）或17到20（下）。

特別注意

The spectacled porpoise is not likely to be confused with other species, when seen well. But at a distance, there can be some confusion with Commerson's dolphin and Burmeister's porpoise,which both share portions of its range. These 3 species can best be distinguished by dorsal-fin shape and colour pattern differences.

眼鏡斑豚

基本介紹