Management of aquatic plants in Washington State using grass carp : effects on aquatic plants, water quality, and public satisfaction 1990-1995 / Scott A. Bonar, Bruce Bolding and Marc Divens.
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TextPublication details: Olympia, WA : 1996. Washington Department of Fish and Wildlife,Description: iv, 28 p. : ill. , maps ; 28 cmOnline resources: Abstract: We investigated the effects of grass carp Ctenopharyngodon idella on public satisfaction, aquatic macrophyte communities and water quality of 98 Washington lakes and ponds stocked with grass carp between 1990-1995.Noticeable effects of grass carp on macrophyte communities did not take place in most waters until two years following stocking. After two years, submersed macrophytes were usually either completely eradicated (39% of the lakes) or not controlled (42% of the lakes). Control of submersed macrophytes to intermediate levels occurred in 18% of lakes at a median stocking rate of 24 fish per vegetated surface acre. Most of the landowners we interviewed (83%) were satisfied with the results of introducing grass carp. Average turbidity of sites where all submersed macrophytes were eradicated was higher (11 nephelometric turbidity units [NTU's] than sites where macrophytes were controlled to intermediate levels (4 NTU's) or not affected by grass carp grazing (5 NTU's). Most of this
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Includes bibliographical references (p. 24-27).
We investigated the effects of grass carp Ctenopharyngodon idella on public satisfaction, aquatic macrophyte communities and water quality of 98 Washington lakes and ponds stocked with grass carp between 1990-1995.Noticeable effects of grass carp on macrophyte communities did not take place in most waters until two years following stocking. After two years, submersed macrophytes were usually either completely eradicated (39% of the lakes) or not controlled (42% of the lakes). Control of submersed macrophytes to intermediate levels occurred in 18% of lakes at a median stocking rate of 24 fish per vegetated surface acre. Most of the landowners we interviewed (83%) were satisfied with the results of introducing grass carp. Average turbidity of sites where all submersed macrophytes were eradicated was higher (11 nephelometric turbidity units [NTU's] than sites where macrophytes were controlled to intermediate levels (4 NTU's) or not affected by grass carp grazing (5 NTU's). Most of this