Murano Uranium Sommerso Glass Fish

This is a Murano fish but I can't confirm the maker. One or two similar ones I've seen are attributed to Seguso (as usual) or Cenedese. I'd be grateful if anyone can identify the maker, perhaps there's a labelled or signed one somewhere. It is actually red and yellow glass but takes on a green colour at the merest hint of sunlight, length is about 8", weight 2lbs.