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Eurasian Watermilfoil

Eurasian watermilfoil is an exotic plant, introduced to the United States by the aquarium industry, and it is rapidly becoming a major nuisance throughout North America. Eurasian watermilfoil is a submersed perennial plant with finely dissected feather-like leaves. The leaves are arranged in whorls of 4 (rarely 5) around the stem at each node. Each Eurasian watermilfoil leaflet generally has 14 or more paired divisions per leaflet. The growing stem tips are tassel-like and often red; especially early in the growing season. This aquatic plant is capable of rapid dispersion, principally by fragmentation of plant parts. Each fragment is capable of growing roots and developing into a new plant. Removal of fragments is advised to prevent its spread into new areas. Eurasian watermilfoil is quite competitive with native species and may completely dominate a plant community within a few years after introduction. Due to the plant's ability to form dense growth, water use activities and aesthetics may become severely impaired. These plants are of little value to wildlife or fisheries. ACI recommends treating Eurasian watermilfoil through an aggressive application of an approved aquatic granular herbicide as early in the spring as possible before the plants have less than a foot of new growth. If the initial treatment is well timed, repeat applications are often unnecessary in New Mexico.

Another popular treatment that ACI heartily endorses is the introduction of grass carp. Eurasian watermilfoil is a preferred species of aquatic vegetation for grass carp (however they will not normally eat filamentous algae) and can eat 2-3 times their weight each day. These fish are usually stocked at a length of 8-10 inches and are not considered an effective control of aquatic vegetation until their second season in your lake. They have a life span between 10 and 15 years but are only effective for approximately 5-6 years. In New Mexico, grass carp can only be imported if they are certified sterile (unable to reproduce). This is actually a benefit because it accomplishes two goals. First, the grass carp that are stocked into your lake cannot overpopulate. Second, the number of grass carp in your lake can be adjusted to provide the desired amount of vegetation control.

 

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Aquatic Consultants Inc. is comprised of licensed architects, engineers, construction managers, and professional fisheries biologists specializing in lake construction, and pond construction, lake design, and lake management for trout and trophy fish, irrigation lakes, aesthetic lakes, and recreation lakes as well as stream restoration, construction and management throughout the World.

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