Figure 1. This is a frame grab from a video uploaded by johnniebis316 in YouTube showing the fish pond in his backyard where he keeps goldfish, not koi. The pond surface is completely covered with water hyacinths. 

See the video here: http://www.youtube.com/watch?v=lKhwDMg09gM

Figure 2.  The water spout at the center of the pond.

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