1. Please go ahead to map the movable bridges.
2. The name "Fish Wave" is just one of the 8 themes. See page 5 of https://www.legco.gov.hk/yr20-21/chinese/panels/dev/papers/dev20210824cb1-1247-1-ec.pdf.  Using the second theme "play wave" as example, not the whole section is the playground. For the third theme "fish wave", it is also the same. The western section of "fish wave" is just a narrow footpath and a wider shared path. There is clearly not enough space for fishing. See also page 6 of the PDF - it clearly shows that the fishing platform is within the eastern end (the oval shape area).