This origami base is really just two Rabbit Ear Folds.

Fish Base Step 1

1) Start of by folding a square of paper in half diagonally.

 

Fish Base Step 2

2) Do a Rabbit Ear Fold on one side.

 

Fish Base Step 3

3) The completed Rabbit Ear Fold.

 

Fish Base Step 4

4) Do another Rabbit Ear Fold on the other side.

 

Fish Base Step 5

5) The completed Fish Base.

 

Fish Base Step 6

If you open the model up you’ll see the following Mountain (black) and Valley (red) folds.

 

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