The idea with PV on water is not so bad, if they have the right places. In some areas land is scare and the solar installation can reduce the evaporation from reservours. On the water the cells are also relatively cool and thus can give good efficiency. It is still not without problems: the wave action is additional stress and birds find nice resting places, so that the panels get dirty in some areas.
I don't see animals using them for crossing the water (usually they are more something for small to medium size lakes, not rivers). The shade may effect the water life, not necessary bad, but a change.
Wind can be a problem on rather large water areas, less with smaller ones.
Having occasionally strong storms does not mean that they get good wind for wind power. Peak wind and average wind not always come together, though exposed places amplify both.