Ellie Bentley writes
K wrote:
So if you have a blanket weed problem, green
tench are better. They're smooth and streamlined not knobbly and spiky.
You put them in when small, they disappear for a couple of years then
reappear 9 inches long and very fat, basking at the surface and making a
huge splash when disturbed.

K, how might green tench cope when flow into and out of a pond during
summer months stops and natural oxygenation is poor?

Don't know. It lives in canals, which aren't the best oxygenated
conditions, and it's fairly tolerant, but how that compares to your
conditions I'm not sure.
--
Kay