Arc of Native Fishes

The Arc project is designed to study how land forms in the Sacramento-San Joaquin Delta interact with freshwater inputs and tides to create habitat favored by native fishes. The investigation focuses on regions in the North Delta where fish surveys have shown relatively high populations of native fishes - regions including Suisun Marsh, the flooded Sherman Island and the Cache and Lindsey sloughs. The areas together form an arc, inspiring the project name "North Delta Arc of Native Fishes."

This study is a unique examination of how local, regional and broad-scale environmental conditions influence fish recruitment, rearing, and reproduction in diverse habitats, including restored wetlands. By combining water quality, nutrient availability, and local input/export data with zooplankton, epibenthic invertebrates, and fish sampling data, a model of ecosystem function is being developed. This model help inform how effectively tidal marsh restoration projects work to support native fish populations in the CLC.


This research explores:

-How changes in overland flow influence conditions for pelagic and native species

-Hydrodynamic variability and its influence on biomass accumulation and food availability for pelagic organisms

-Pulses of primary productivity and subsequent effects on food webs

-Drivers of differences in fish community composition among sloughs

-Restoration outcomes


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