The pond is not going to be empty. The whole point of spending all that money on it is to preserve the flora and the fauna. It will be full of both, and that is why, qua habitat, it is costing money to build and survey the plants and animals already living there. Fanny has posted pictures of the rarer plants and animals there from a list given her by the surveyor.
Of course whether or not Jarvis will perform the single most important restoration at Lalande is a separate question. As Davy is a big green, I think he's chosen this as the hill he's going to die on and I think he will win.
I'll say it again.
The pond is not now, never has been, will not be, empty.