Glennon Fish Farms, Inc.  malone lake fish hatchery

Aquatic Weed Control

You shouldn't have to mow your pond to go fishing.

Grass carp are our specialty. As the pioneer of the grass carp industry and the World's Largest producer of UFWS Certified Triploid Grass Carp we have what it takes to keep your aquatic vegetation under control.


Grass carp are available in most States. However every State regulates the sale and possession of Grass carp differently. It is a felony to violate a State law regarding the interstate shipment of fish. Please check your State laws before ordering.
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Cost Effective, Long Term Biological Control

Triploid Grass Carp are our specialty!

I Want To Buy Grass Carp

Grass carp will control most aquatic weeds, but there are some things they do not prefer. Emergent plants such as cattails and alligator weed are not preferred. Larger fish do not like filamentous algae. AQUAPLANT provided by Texas A&M is a great resource for weed identification.
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Emergent and Floating Plants
Emergent plants are those that may be rooted in water but most of the plant is above the water line. These include plants such as cattail, bulrush, arrowhead, spatterdock and bull tongue. Grass Carp generally do not eat emergent plants unless they can nibble on young leaves hanging in the water. Very large fish will eat some emergent plants if the water floods over the plant and the fish can get on top of it.

Floating plants may have roots under water or on the shoreline but most of the plant floats on top of the water. These include plants such as waterlily, watershield and alligatorweed. Grass carp may occasionally nibble of young growth but generally do  not control floating plants.

What Kind Of Weed Is This?

Submerged Plants and Duckweed
Submerged plants are those that root in the bottom of a pond and never break the surface of the water. These include plants such as hydrilla, coontail, pondweed, bladderwort, naiad, elodea and milfoil. Grass carp control submerged plants very well.

Duckweed is a simple floating plant that can appear to cover the entire surface of a pond. Smaller grass carp control duckweed very well.

Tell Me More About Grass Carp

Grass Carp are native to the Amur River in Northern China. They were brought to the United States in 1964 by the USFWS to research their use as a biological control for aquatic vegetation in public waterways. J.M. Malone and Son produced the first commercial triploid grass carp crop in 1983 and pioneered the industry.
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There are three types of algae that cause trouble in ponds. The first is planktonic algae which can cause thick pea soup like scums such as blue green algae. The second is filamentous algae which can cause thick floating and sinking mats such as pithophora and lynga. The third is chara which resembles a submerged plant.

Grass carp do not control planktonic algae and larger grass carp do not prefer filamentous algae but will eat it if there is nothing else available. Smaller grass carp will readily consume filamentous algae until they reach a size at which it begins to interfere with the teeth in their throat. Grass carp will control chara very well.