What plant is this?

I've been wondering the same thing, I've seen a bunch of it this year. It can also take on a more red appearence.

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The Last Coco

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That's what I've been seeing. It will fool you. It looks like duckweed until you get right up on it. Do ducks eat it?

Go on... Haha I have no clue what it is or if ducks eat it

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salvinia?

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No

It's not Salvania. Pretty sure it's what Last Coco posted

Hydrilla

It's not hydrilla. It's duck weed. You're fine.

No. This is Azolla. "Mosquito fern"

From an Aggie site so take it for what it's worth:

LINK

Mosquito Fern or Azolla is a small free-floating fern approximately 1 to 3/8 inches wide. Leaves of the mosquito fern overlap giving a quilted look to the surface and hide the stem. A single root protrudes from each stem. Mosquito ferns can vary in color from green to red and are generally found in quiet ponds protected from wind action. Mosquito ferns can be aggressive invaders in quiet ponds and are often found mixed in with duckweeds or watermeal. If these fern colonies cover the surface of the water, then oxygen depletions and fish kills can occur. These plants should be controlled before they cover the entire surface of the pond.

Dense colonies of mosquito fern provide Habitats for many micro and macro invertebrates. These invertebrates in turn are used as food by fish and other wildlife species (e.g. amphibians, reptiles, ducks, etc.). After aquatic plants die, their decomposition by bacteria and fungi provides food (called ?detritus?) for many aquatic invertebrates. Mosquito fern has no known direct food value to wildlife.

Thanks for the responses, I think it's mosquito fern looking at the pictures. Even if the ducks aren't eating the plant, I dont think it will hurt.