Hi
At this point I am unaware that there is anything living in the pond, when we bought the place the estate agent told us there were loads of different types of fish in the pond (on the market for 2 years in all and sold previously in that time), so we were a little surprised to find nothing, we were told by a neighbour that a van had come along the lane looking for this address saying they had come to look at some fish and we know there was a tenant in the annex who we were told felt she was owed somthing from the estate but was not going to get anything, so we put two and two together and decided she must have sold them.
I had not thought about protected species, and think I may not look them up just in case.
Sometimes its better not to know, although I suspect its not the case.
K