Presumably this bottle is closely related to the more commonly found pink-blush bottle of tall baluster shape carved with layered lotus leaves. The fish would indeed be in keeping with the Buddhist theme of the lotus and the technical skills involved would suggest the same period, if not workshop. For an example of the lotus bottle, see Clare Lawrence, Miniature Masterpieces from the Middle Kingdom, The Monimar Collection of Chinese Snuff Bottles, London, 1996, pp. 242-243, no. 115.
See, also, Xin Gengqi and Zheng Rong (chief compilers), Masterpieces of Snuff Bottles in the Palace Museum, Beijing, 1995, p. 94, nos. 80-81 for two double-coloured glass fish bottles, one in blue overlay on white, the other red overlay on white