Hi Tim,
I don't really know about Bordeaux. I've fished a couple of times in the "big" (big for us in France) lakes, under Bordeaux, Cazeaux-Sanguinet. There is about 4/5 big lakes long side the coast. All are plenty Zander, Pikes, Perch & sometimes Bass like Biscarosse/Parentis, where there were the 1st round of the B.A.S.S France Nation. This big lakes are kind special, because you don't have water from the bank to 100m further, then a big drop off, and this all on the west side of lake. On the east one, some of them have military ground, so fordidden.
Next to the drop off, you can find weeds, people are fishing this drop off/weeds specially for Perch (some are big about 3/4 lbs)
There was a time here, bass were in several kind of piece of water, but as I said, their population tend to regress.
But it's too bad you'll come in May, because it will be "big kermesse" on water ... fisherman everywhere due to the opening of lure fishing. Plus, at this period, Zander & Bass are spawning. Bass is closed to July, but not Zander, but not sportmanship to make bedfishing on Zander.
If you have any questions that I can answer, you can ask me here or in private message
Concerning the contributing in the forum, I will do my best, I only have a 2 fully years experiences compares to you