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Lenny Grimaldo, Ph.D.
Senior Managing Director, Fisheries and Aquatic Sciences
Ph.D., Ecology, Factors Affecting Native Fishes in Tidal Freshwaters of the San Francisco Estuary University of California at Davis, 2009
M.S., Marine Science, Diets and Carbon Sources of Fishes from Open-water, Edge, and SAV Habitats in Restored Freshwater Wetlands of San Francisco Estuary. San Francisco State University, Romberg Tiburon Center for Environmental Studies, 2004
B.S. Wildlife and Fisheries Conservation Biology, University of California at Davis, 1996

Lenny Grimaldo is a fisheries biologist with over 20 years of experience conducting research on fish in estuarine and riverine ecosystems. His research focuses on understanding mechanisms affecting food webs, fish use, and habitat in tidal marsh and shallow water environments. His recent work focuses on examining factors that affect Delta Smelt, Longfin Smelt, and juvenile Chinook Salmon in the upper San Francisco Estuary. He is the principal investigator for Delta Smelt Entrainment Studies under the direction of the Bay-Delta Collaborative Adaptive Management Team (CAMT), is leading a series of early life history studies of Longfin Smelt and other fish and invertebrates as part of California Department of Fish and Wildlife Proposition 1 Study, and is co-leading a large outflow study for Reclamation to better understand how Delta Smelt and their prey respond to freshwater outflow in the estuary. Lenny oversees ICF’s Fish and Aquatic Science Team (FAST), focusing on research, monitoring, and technical projects throughout the western United States. View ResearchGate profile.

Selected Publications & Projects
Grimaldo, L.F., R.E. Miller, C.D. Peregrin, and Z. Hymason. 2012. Fish Assemblages in Reference and Restored Tidal Freshwater Marshes of the San Francisco Estuary. San Francisco Estuary and Watershed Science 10: 1-21.
Wilder, R., J. Hassrick, L.F. Grimaldo, M. Greenwood, S. Acuna, J. Burns, D.Maniscalco, P.Crain. TC Hung. Feasibility of PIT and Acoustic Tagging for Endangered Adult Delta Smelt. North American Journal of Fisheries Management 36:1167-1177, DOI: 10.1080/02755947.2016.1198287
Grimaldo, L.F., F.Feyrer, J.Burns, and D.Maniscalco. 2017. Sampling Uncharted Waters: Distribution and Rearing Habitat of Larval Longfin Smelt (Spirinchus thaleichthys) in the Upper San Francisco Estuary. Estuaries and Coasts. DOI 10.1007/s12237-017-0255-9
Grimaldo, L.F., A.R. Stewart, and W. Kimmerer. 2009. Dietary segregation of pelagic and littoral fish assemblages in a highly modified tidal freshwater estuary. Marine and Coastal Fisheries 1:200–217.
Grimaldo, L.F., T.Sommer, N.Van Ark, E.Holland, G.Jones, B.Herbold, P.Smith, and P. Moyle. 2009. Factors affecting fish entrainment into massive water diversions in a freshwater tidal estuary: Can fish losses be managed?" North American Journal of Fisheries Management 29:1253–1270.