Warm water fisheries assessments using standard gangs of gill nets were conducted in Conesus Lake in September of 2001, 2004, and 2009. The purpose of the surveys was to assess the fish community; the contribution of stocked fingerlings to the walleye (Sander vitreus) population; estimate population characteristics of walleye, smallmouth bass (Micropterus dolomieui), and northern pike (Esox lucius); compare fish community structure to previous surveys; and guide the development of appropriate management recommendations. From the 1990’s to the 2000’s, species dominance shifted from walleye to sunfish (Lepomis, sp.), and yellow perch (Perca flavescens) went from being a major component of the fish community in 1991 to a minor component in 1997, to nearly absent in 2004. Brown bullhead (Ameirus nebulosus) became an increasingly larger component of the fish community in the 2000’s. The walleye population during the 2000’s had an abundance of larger, older fish in excellent condition. Despite extensive migratory spawning runs in the inlet streams that could be producing fry that potentially recruit to adults, the walleye population is mainly sustained by stocked fingerlings. While they are growing slower than in the 1990’s, survival and recruitment of the stocked fingerlings remains good. Slower growth and lower condition could be a sign that the alewife population in Conesus Lake is declining, but no definitive statement regarding the alewife population can be made until further hydroacoustic surveys of the forage community are conducted. Because of discrepancies of scale ages among readers, walleye age and growth analyses for these surveys should be viewed cautiously, and otoliths should be used to age walleye in future surveys. The fishing quality for Conesus Lake walleyes should remain very good for several years. The smallmouth bass population by 2009 had an abundance of larger, older fish in fair condition. The 2007 and 2006 year classes appear to be strong, but individual fish of these year classes may grow slowly and be in less than desirable condition. The fishing quality for Conesus Lake smallmouths should remain good for several years as the fish from these year classes mature and grow. Northern pike appear to be moderately abundant. The recent maintenance of appropriate lake water levels during early spring have provided adequate flooding of constructed marshes in the Conesus Inlet Wildlife Management Area. This appears to have resulted in successful spawning, fry production, survival, and recruitment of northern pike. Adult pike, while fast growing, are in below average condition in Conesus Lake. The yellow perch decline in abundance following a late 1970’s alewife (Alosa pseudoharengus) invasion continued during the 1991- 1997 period and remained at this low level from 2001 to 2009. Alewife gill net CPUE varied greatly from 1985 to 2001 and remained at a consistent low level since 2001. While relatively large, yellow perch are in poor condition and alewives are smaller than average and in poor condition. Rock bass (Ambloplites rupestris) and bluegill (Lepomis macrochirus) relative abundance doubled from 2001 to 2009, while pumpkinseed (Lepomis gibbosus) abundance showed little change. Survival and growth appears to be consistent for all three species. Growth was above average for all three species, but condition was poor for rock bass and moderately poor for pumpkinseed and bluegill. Rock bass size structure was poor and few preferred sized 2 pumpkinseeds and bluegills were sampled. Size quality in bluegills declined from 1991-1997 levels. It is recommended that all current management actions be continued, 50 day walleye fingerlings be stocked annually over five years, the success of stocked 50 day walleye fingerlings be evaluated, and new objectives be developed in a revised Conesus Lake fisheries management plan.

Management Practices to Reduce Farm Chemical Losses with Agricultural Drainage (p. 467) The Fate of Materials Exported by the Big Blue and the Black Vermillion Rivers into Tuttle Creek Reservoir, Kansas (p. 471) The Interaction of Biological and Hydrological Phenomena that Mediate the Qualities of Water Draining Native Tallgrass Prairie on the Konza Prairie Research Natural Area (p. 478) Implications of Airshed Processes and Atmospheric Deposition of Nonpoint Pollutants (p. 483)

An in-depth comparison of phytoplankton and zooplankton from Lakes Erie, Huron and Michigan is presented based on extensive lake-wide surveys during spring, summer and autumn of 1983. This comparison was achieved by the application of standard and consistent identification, enumeration and data-processing techniques of plankton along north-south transects in Lakes Huron and Michigan and east-west transects in Lake Erie. For lakes Erie, Huron and Michigan respectively, 436, 411 and 452 algal taxa and 71, 61 and 73 zooplankton taxa were identified. Based on indicator species and species associations, the plankton assemblage was consistent with a mesotrophic-eutrophic designation for Lake Erie, oligotrophic destination for Lake Huron, and mesotrophic-oligotrophic designation for Lake Michigan. Species lists for each are provided. Original source data for each station visit are provided in the attached microfiche.

This document describes the analytical procedures currently used at the Environmental Health Center, New York State Department of Health, for the chemical analysis of water and sediments in the Genesee River Watershed Study.

Bacterial Water Quality and Shellfish Harvesting (p. 447) Evaluation of Nonoint Source Impacts on Water Quality of Forest Practices in Idaho: Relation to Water Quality (p. 455) Illinois Agricultural Soil Erosion Control Standards: A Useful Tool for Nonpoint Source Pollution Control (p. 459) Ground Water Quality Standards (p. 464)

Point/Nonpoint Source Trading Program for Dillon Reservoir and Planned Extensions for Other Areas (p. 413) Optimizing Point/Nonpoint Source Tradeoff in the Holston River Near Kingsport, Tennessee (p. 417) Protecting Tillamook Bay Shellfish with Point/Nonpoint Source Controls (p. 425) Point/Nonpoint Source Interface Issues in Wisconsin (p. 426)

Ten pesticides and pesticide metabolites were detected in ground-water samples collected from each of 32 community water-supply (CWS) systems in central and west ern New York in August 1999. The sampling sites consisted of 30 wells that ranged from 23 to 120 feet in depth, and 2 springwater infiltration galleries. All wells tapped unconfined sand and gravel aquifers except one, wh ich was completed in karstic limestone. These systems were selected because they were deemed vulnerable to pesticide contamination; accordingly, the results are not considered representative of all CWS systems in New York. The samples were analyzed for 60 pesticides. Twenty-four of the 32 samples contained at least one pesticide, and one sample contained eight pesticides or pesticide metabolites. New York State and Federal water-quality standards were not exceeded in any sample collected in this study. All pesticides detected in the CWS wells are a specific class of herbicides that are used to control broadleaf weeds and undesirable grasses in agricultural fields, lawns, and other areas that require control of vegetation. The four compounds detected most frequently were the herbicides atrazine and metolachlor and their metabolites--deethylatrazine and metolachlor ESA. Maximum concentrations of the four compounds ranged from 0.088 micrograms per liter (µg/L) for deethylatrazine to 3.58 µg/L for metolachlor ESA.

Managing Headwater Areas for Control of Sediment and Salt Production from Western Rangelands (p. 347) Salinity: Nonpoint Source Problem in the Colorado River Basin (p. 352) Continuous Salinity Monitoring in the Colorado River Basin by the Utah Bureau of Water Pollution Control (p. 356) Salinity Control in the Grand Valley of Colorado (p. 359)

Acid Mine Drainage: Surface Mine Treatment and In Situ Abatement Technology (p. 307) Coal Industry Perspectives on Nonpoint Source Pollution (p. 311) Trends in Post Mining Land Uses - Are We Doing Our Children Justice? (p. 313) Factors and Treatment of Abandoned Acid Mine Lands for Controlling Nonpoint Source Pollution (p. 314)

Practical Guidelines for Selecting Critical Areas for Controlling Nonpoint Source Pesticide Contamination of Aquatic Systems (p. 363) A Method for Prioritizing Water Quality Problem Areas (p. 368) The Impact of Nonpoint Source Fecal Loading on Backcountry Waters in Grand Canyon (p. 374) The Use of Wetlands in Treating Nonpoint Source Pollution (p. 380) Antidesertification of Riparian Zones and Control of Nonpoint Source Pollution (p. 382)