This is a Ryukin, and has a lovely 3d body, staring eyes and beautiful flowing fantail. Characterised by a hunched back, chunky body and pot belly, they swim slowly and provide decorative elements to any aquarium.
I released I have folded few fish in this collection, so will pursue that line for a while I think as there is a richness and plethora of designs.
Structurally it is a fascinating fold – all though the folding sequence I am guessing as to what bit of the sheet becomes what. Some seriously challenging manipulation of layers inside the body to realise all the necessary stickey-outey bits at the right scale, in the right place.
An economic fold, it makes good use of the sheet and as you can see is quite large given the size of the paper to start with – that said, there are some fine details that will make folding this again smaller a real challenge.