| Introduction | W.N. Harman | 1 | 
		
			| ONGOING STUDIES: |  |  | 
		
			| OTSEGO LAKE WATERSHED MONITORING: |  |  | 
		
			| Otsego Lake limnological monitoring, 2021.  | H.A. Waterfield & M.F. Albright | 11 | 
		
			| A survey of Otsego Lake's zooplankton community, summer 2021. | M.F. Albright | 22 | 
		
			| Water quality monitoring of the five major tributaries to Otsego Lake, New York 2021 results update. | H. A. Waterfield and J. Gifford-Neubauer | 38 | 
		
			| SUSQUEHANNA RIVER MONITORING: |  |  | 
		
			| Water quality of the Upper Susquehanna River, summer 2021. | A. Hage | 52 | 
		
			| REPORTS: |  |  | 
		
			| Survey of hemlock wooly adelgid beetles on Otsego Land Trust properties. | S. Brabant, R. Cozine, and C. Tarlen | 61 | 
		
			| Changes in the diversity and abundance of underwater plants in Otsego Lake since 1935. | W.N. Harman and J. Gifford-Neubauer | 69 | 
		
			| Bathymetric survey in the vicinity of the Susquehanna River and Cherry Valley Creek confluence, Town of Milford, Otsego County, NY. | H.A. Waterfield and B. Guerrero | 74 | 
		
			| Discharge and suspended sediment load estimation at ungauged turbidity monitoring sites. | L. Hasbargen and R. Cozine | 79 | 
		
			| A 15-year survey of parasites of yellow perch (Perca flavescens) from Otsego and Canadarago Lakes. | F. Reyda, K. Silvester, A. Hidalgo, A. Loscerbo, Y. Salinas and T. Pokorny | 102 | 
		
			| Invasive rusty crayfish in the Upper Susquehanna River watershed. | A. Hage and D. Stich | 108 | 
		
			| Fish diversity surveys of the Upper Susquehanna watershed. | A. Hage and D. Stich | 113 | 
		
			| Changes in the macrobenthic invertebrate community in Otsego Lake between 1968 and 2021 by documentation of the percent biomass of major invertebrate taxa. | W.N. Harman and J. Gifford-Neubauer | 118 | 
		
			| Changes in the diversity and character of the molluscan community in Otsego Lake between 1968 and 2021. | W.N. Harman | 135 | 
		
			| Pearly mussel survey of Crane Brook at Port Byron, NY. | P.H. Lord and B. Guerrero | 142 | 
		
			| Continued annual monitoring of Moe Pond, 2021. | J.D. Skelton | 152 | 
		
			| Survey of macrofungi on Otsego Land Trust properties, Otsego County, NY. | S. Brabant and J. Heilveil | 161 | 
		
			| Assessing the spawning run of rainbow smelt (Osmerus mordax) in Otsego Lake. | J.D. Skelton and C.F. Cotton | 168 | 
		
			| Detection of estrogenic compounds throughout the wastewater treatment process: Collection and analysis of water samples. | C. Tarlen | 183 | 
		
			| Glyphosate in the Upper Susquehanna River basin stream network: 2021 snapshot. | H.A. Waterfield | 189 | 
		
			| Trap net monitoring in the weedy littoral zone at Rat Cove and rocky littoral zone of Brookwood Point, Otsego Lake, 2021. | J.D. Skelton | 193 | 
		
			| Fishes of Otsego Lake: Update | C.F. Cotton | 199 | 
		
			| Monitoring the effectiveness of the Cooperstown wastewater treatment wetland, 2021. | M.F. Albright | 201 | 
		
			| A geospatial inventory of Otsego Lake tributaries with comments on relevant landmarks. | C.F. Cotton, W.N. Harman, M.F. Albright and H.A. Waterfield | 210 |