Backyard Aquaponics
A place to discuss aquaponics

Someone mentioned in the comments section of that page that it might work better if it were oriented horizontally instead of vertically. How cool would it be to make a windmill that looks like a fish swimming back and forth through the air! The interesting thing about this idea to me is to use a small, low energy oscillation (to aim the wing up and down or left and right) to induce a large, high energy oscillation using the wind's flow past the wing.

I still like the wind generator that uses the tight belt or ribbon.

Yes, someone in the comments section mentioned that this is similar except rigid. It would be easier to hook a pump up to this though, the belt would work better with electrical generation.

Someone has made a horizontally-flapping tail/wing for tidal power generation. Makes a lot of sense to mimic fish propulsion:

http://www.biopowersystems.com/biostream.php

thanks for the link... very interesting info!