These small fishes may feed effectively on filamentous algae, duckweed, and watermeal, but again their diets changes as they grow larger to feed almost exclusively on submersed aquatic macrophytes. If you want to know a bit more about algae and grass carp, read the following chapters: The algae was to much for the grass carp to handle so I poisoned the algae. Pickerelweed Willows 12. Grass carp may eat aquatic plants before eating filamentous algae. As well as munching on algae, this species will happily eat a lot of problematic aquatic vegetation, such as elodea and duckweed. I have about 11 grass carp left and the neighbor put in two asian, colored carp. They usually do not eat or control filamentous algae, large-leaf pondweed, cattail, bulrush, arrowhead, burreed. This is why some people use them for algae control in ponds. They appear to be healthy and look to be about 15 lbs in size. Because they are totally herbivorous (unlike the common carp), they do not compete for food with desirable game fish and commercially valuable species. I have watched them suck down large amounts of algae. Learn about methods for reducing algae on the algae control page. How much to stock. Fragrant waterlily Water pennywort 9. Although many publications claim grass carp do not control filamentous algae well, diploid grass carp always controlled it in Noble Research Institute ponds when healthy fish 8 to 14 inches long were stocked at 12 per acre and were contained with appropriate parallel-bar barriers across the spillways. Some reports indicate that adding grass carp to a lake may promote the growth of other algae. Planktonic algae White waterlily See the below for what weeds were found in Lake Chaffee in a 2009 study CT Requirements before liberation 1. watershield, white waterlily and spatterdock. ... ** Filamentous algae * Watermeal 8. A Filamentous algae (many species) A Sago pondweed (Stuckenia pectinata) S White water lily ... grass carp do not prefer emergent plants and most importantly, the various species of ... is a plant that grass carp prefer not to eat. Control usually lasted 20-25 years. However, algae are not their preferred food source, and grass carp will consume them if other aquatic plants are unavailable. Raking. Frogbit Water primrose 10. Do grass carp eat algae? They do not muddy my pond. Grass carp may control filamentous algae, although filamentous algae is not a preferred food. What do Grass Carp eat? Its least favorite aquatic plants are species such as water lily, sedges, cattails, and filamentous algae. “The grass carp was considered for introduction into the U.S. primarily because of its plant-eating diet, ... and Brazilian elodea. In my 3/4 acre mud bottom pond I use 15 Isreali carp, 20 KOI and Channel catfish for my Fitamentous algae (rug mat algae)to control my algae. 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