Monday, February 28, 2022

Safe Aquatic Weed Control for Ponds

grass carp

If you have a weed problem in your pond, you may want to consider stocking it with Grass Carp.  These fish have a tremendous appetite for aquatic vegetation and can be used as a non-chemical agent to control weed growth in ponds.  The fish that are available for stocking are Triploid Grass Carp, which means they are sterile and cannot produce viable young.  This non-native species of fish does not compete with native fish species that you may already have swimming around in your pond.

            Because these fish are not native to New York and because they have huge appetites, a permit is required from the New York State Department of Environmental Conservation.  The Herkimer County SWCD starts the permitting process now with stocking to take place in June 2022.  The permitting process conducted by DEC is free of charge. If permitted you will be able to purchase these fish from the Herkimer County Soil & Water Conservation District, an approved Triploid Grass Carp supplier.

            If you would be interested in more information, including a permit application for stocking Grass Carp, please contact the Herkimer County Soil & Water Conservation District at 315-866-2520, Ext. 5 before April 30thInformation is also available on our website at

Photo by Ryan Hagerty/USFWS

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4 Responses

  1. Nathan says:

    are there not any native fish that can be used over non-native fish? even if sterile, i never trust.

  2. SNAPPER PETTA says:

    Be aware that NYS will not issue you a permit for grass carp if your pond has any overflow that might go into another body of water. Even though these fish are sterile, DEC wouldn’t issue us a permit for our pond because there is a seasonal overflow that eventually empties into the Susquehanna River. Because of that, we had to resort to chemicals to alleviate our pond issues; something I was hoping to avoid.

    • SYLVIA D RUSSO says:

      What chemical did you use? My pond empties into a reservoir and is covered with an invasive plant all summer.