You must know the duck wild feed

Goldfish Algae Commonly known as snapdragon, a perennial aquatic herb, the plant sinks in the water, and the top is sometimes slightly exposed to the water surface. The stem is smooth and slender, up to 60 cm long, with sparse short branches. The impeller is made with loose thorn-like serrations on the edges and the teeth are more to one side. It grows in the still waters of small lakes, and ponds and ditches are also common. fDC China Feed Industry Information Network - based on feed, serving animal husbandry

Valerian also known as sedge grass, bitter grass, flat water grass. It has slender lychee, leaf base, thin band shape, thin leaves, length up to 2 meters, width 8 mm ~ 14 mm, green translucent, generally growing on both sides of the channel and the quiet water around the lake. fDC China Feed Industry Information Network - based on feed, serving animal husbandry

Black algae is also known as the water king, water lantern grass. Stem length 0.5 m ~ 1.5 m, less branches, leaves 4 ~ 8 pieces, round, strip-shaped lanceolate, 1 cm ~ 2 cm long, about 1.5 mm ~ 2 mm wide, with small teeth on the edges. Born in ponds, lakes, and ditch. fDC China Feed Industry Information Network - based on feed, serving animal husbandry

Amaranth Stems are slender and stem length depends on the depth of the water. Leaves alternate, leaves are heart-shaped elliptical, nearly leathery, slightly thick, up to 15 cm long, up to 12 cm wide, rounded at the top. It grows in ponds, lakes and small rivers. fDC China Feed Industry Information Network - based on feed, serving animal husbandry

槐叶萍 Stems lying in the water, no roots. The leaves are round on the knot, three for one round, two of which are floating leaves, long oval, blunt at the top, and brown pilose under the leaves. It grows in ponds, rice fields, ditch, and still waters. It is the favorite grass for ducklings. fDC China Feed Industry Information Network - based on feed, serving animal husbandry