Your candlestick is lovely, John. It is well detailed. From the sketchy bit I've picked up about them. They were made by Salviati and Barovier early, then copied by many people later. I had a few like yours, but only with prunts. I sold them as Salviati back in my earlier years. Then I noticed many that were similar that weren't by Salviati. To be on the safe side, I just started calling things like this "Venetian glass." Works okay in stores, but not so good on eBay, where people like definite attributions. Experts can probably be sure of the differences, but the best I could do was to judge good ones from bad ones. Yours is a good one.
ICET has also started to make the dolphin pieces, but they are clumsy looking, so easy to spot.