The Hudson River is home to a diverse community of resident fish species that are vital to the ecosystem's health and stability. These species, which include white perch (Morone americana), black basses (e.g. largemouth (Micropterus nigricans) and smallmouth bass (Micropterus dolomieu)), hogchocker (Trinectes maculatus), spottail shiner (Notropis hudsonius) among others, play crucial roles in nutrient cycling, supporting the food web, and maintaining the ecological balance within the river system. Many of these species have adapted to the unique freshwater-marine environment of the Hudson, which is influenced by both tidal and freshwater conditions.
Historically, the Hudson River has been a hub for commercial and recreational fishing. However, the health of resident fish populations in the river has fluctuated due to a variety of factors, including pollution, habitat loss, and the introduction of invasive species. Over the years, federal agencies, academics partners, and non-governmental organizations have worked to monitor and manage these fish populations to ensure the long-term sustainability of the river's ecosystem.
Current Fisheries
In addition to migratory species, several popular sportfishes are found in the Hudson including largemouth bass, smallmouth bass, channel catfish (Ictalurus punctatus), and walleye (Sander vitreus). See Freshwater Fishing Regulations for up-to-date fishing regulations.
Management
The Hudson River fish community is managed through a combination of habitat restoration projects, regulatory measures, and regular ecosystem monitoring. Key organizations like the DEC, the Hudson River Estuary Management Program (HREMP), and the Hudson River National Estuarine Research Reserve (HRNERR) work collaboratively to monitor fish populations, study water quality, and implement conservation efforts.
Habitat restoration projects aim to improve spawning and nursery habitats for resident and migratory species. These projects focus on removing barriers to fish migration, restoring tidal wetlands, and improving water quality to create suitable habitats for both juvenile and adult fishes.
Several regulatory measures are in place to manage and conserve the Hudson River fish community. Fishing regulations (i.e. catch limits, size limits, and closed seasons) are in place for certain species to prevent overfishing, whereas special regulations afforded to threatened and endangered species (e.g. Atlantic sturgeon) and certain migratory species help protect critical fish habitats and restrict the timing of in-river construction activities.
Monitoring
Resident fishes in the Hudson River are excellent indicators of ecosystem health and monitoring these species provides insight into the overall condition of the river's aquatic environment. Long-term monitoring surveys designed to track population trends over time for striped bass, American shad, and river herring are also used monitor resident fishes. These surveys provide valuable data on fish abundance, size distribution, and species diversity.
Water quality monitoring, such as the Hudson River Environmental Conditions Observing System (HRECOS) involves tracking key water quality indicators, such as dissolved oxygen levels, temperature, pH, and pollutants. These metrics are critical for understanding how changes in water quality affect the survival and health of fish species. Long-term monitoring of these conditions is essential to prevent the ecosystem from reaching critical thresholds that could jeopardize resident fish populations.
DEC in collaboration with the Cary Institute of Ecosystem Studies and the Hudson River Foundation are implementing an Interim Lower Food Web Survey aimed at assessing the health and dynamics of the Hudson River’s lower food web. Monitoring components include phytoplankton and zooplankton surveys, nutrient and water quality analysis, and benthic invertebrate sampling. Field sampling began in 2025 and will continue through 2027.
The Hudson River Biological Monitoring Program (HRBMP) was an extensive annual long-term monitoring program of the Hudson River Estuary from 1966 to 2020 and was implemented to assess the potential negative impacts of cooling water withdrawals from power generation facilities, such as Indian Point Energy Center. One of the main aims of this program was to monitor the status of Hudson River fish populations. This was achieved through three long-term monitoring programs: Longitudinal River Ichthyoplankton Survey, Fall Juvenile Survey (or Fall Shoals Survey), and Beach Seine Survey. This monitoring agreement came to an end in 2020 with the closure of Indian Point Energy Center. With the loss of utility funding, the DEC and a variety of stakeholders have been working to maintain the most important elements of the HRBMP to help guide management decisions that impact fishes. In 2023, through a contract with Normandeau Associates and the Chen Lab at Stony Brook University, DEC re-initiated the Fall Juvenile Survey, one of the three core long-term monitoring programs to monitor young of year fishes in offshore habitats. This survey involves sampling the tidal Hudson River, on a bi-weekly basis from June to November with two kinds of small-mesh trawls.
Research
Invasive Species
Invasive species, such as the zebra mussel, have had significant impacts on the Hudson River's fish community by altering the food web and affecting water quality. Beginning in 2019, DEC has been specifically monitoring non-native species such as round goby (Neogobius melanostomus) and grass carp (Ctenopharyngodon idella) to track population abundance and their potential impacts on resident fish populations and the ecosystem to help guide management decisions aimed at mitigating these threats. Monitoring and research efforts include environmental DNA (eDNA) sampling, acoustic tagging and movement studies, diet analyses, and genetic analyses.
Synthesis of Long-Term Data
In collaboration with the Cary Institute of Ecosystem Studies, we investigated how the power to detect changes fish abundance can vary among species, habitat, and type of survey.
