During the Antarctic summer ozone from other parts of the world flow back over Antarctica, bringing total ozone levels there back to more normal values. The story and the links from it should give you as much detail as you want on what goes on. As to the effects of the ozone hole on sea life, I know that scientists have the additional ultraviolet energy reaching the ocean around Antarctica can lead to cellular damage to small organisms in the ocean, which are the basis of the Antarctic food chain. But I haven't seen any information on any effects on larger creatures such as the penguins, other sea birds, seals and whales around Antarctica. If I do find any good information I'll add a link to it form our Understanding Antarctic wildlife page.
Icebergs do melt, but it takes a long time because they are so big.
To melt, the ice has to warm above 32 degrees, which can take a long time. Icebergs that break off from Greenland are smaller than those from Antarctica. Greenland's icebergs tend to drift south in the Atlantic and melt in weeks or months. Ocean currents tend to carry Antarctic icebergs around the continent where they stay in colder water and air and can take years to melt because they are so big and aren't being warmed as much. Understanding icebergs page.