It's probably, really a fix for your 2D editor. This white area on your transparency/alpha map needs to be slightly smaller. But, you could start actually increasing the trasparency in Bryce via its slider, and it will help, but then it will begin to make the main fish transparent also. ;o/ (This is what I do sometimes when I am doing this with leaves on a tree, but then leaves can be a little transparent, and still look alright)

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