I was only little in the early 1980's, when Caspar was in the news and his pomp, but for some reason his name lodged firm in my memory. Now when I think of that period, his name is the first to spring to mind, before Reagan or Gorbachev or anyone.
And now the name "Caspian Wimblewether" will be sure to follow. So your late lamented fish will live on in my imagination as an emblem of the last years of the cold war as witnessed by an eight year-old boy on monochrome newscasts.
You know, I actually remember Caspar Weinberger's name very clearly, also. (But nobody nicknamed him "Manfred," like we (I) did with Caspian.) Also Tip O'Neill, for some reason. Never figured that one out...
In the interest of full disclosure, it wasn't my fish. He was the Office Fish. But I will always be sad that he perished while he was my charge.