Fisheye is the extreme of a wide angle lens. I think you are not using a fish eye lens, but a fish eye adopter. That is a lens that will "shorten" the focal length of a lens most of the time with 30 % sometimes with 50% when you put it in front of your lens. So you could make a 24 mm lens look or act like a 12 mm.
On your tele lens this only will slightly shorten the 55 mm, but even 50 % of 55 is 27 mm and can't be seen as a fish eye.
I think when you put this on a short lens, the picture you get will be round, like you were using a real fish eye.
You didn't specify which fisheye attachment you're using so I can't be too specific, but most such attachments are designed to work with wide-angle lenses. In the case of the Nikon D40 that would be a lens shorter then 30mm. All the attachment is going to do with the 55-200mm lens is make it into a shorter zoom.
Try using the attachment on a shorter lens, such as the 18-55mm. Of course, for best results use a true fisheye lens instead of putting an attachment in front of another lens.
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