Status of Hudson River Fishes: Local and Regional Perspectives Karin E. Limburg, SUNY-ESF Kathryn A. Hattala, Amanda L. Higgs, Andrew W. Kahnle, Hudson.

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Presentation transcript:

Status of Hudson River Fishes: Local and Regional Perspectives Karin E. Limburg, SUNY-ESF Kathryn A. Hattala, Amanda L. Higgs, Andrew W. Kahnle, Hudson River Fisheries Unit, NYSDEC Robert E. Schmidt, Simon’s Rock of Bard John R. Waldman, CUNY Queens College

From Benson Lossing’s The Hudson From the Wilderness to the Sea (1866)

“The Big Three”

“The Big 7”

Sturgeons

(Kahnle et al 1998, Pikitch et al. 2005) Sturgeons are long-lived, irregular spawners Makes them extremely sensitive to overfishing

Atlantic sturgeon (Acipenser oxyrinchus) Reported landings in NYS (NYSDEC) 1996 – NYSDEC closed state fisheries 1998 – ASMFC closed all other state fisheries 2012 NMFS lists as Endangered Monday – new report out!

Shortnose sturgeon – Federally protected by ESA since 1971 Maryland DNR

The American shad (Alosa sapidissima) Once America’s 2 nd most important commercial fishery – where are they now? -Overfished repeatedly from 1880s to the 1990s - All NY fisheries remain closed since 2010.

Empirical Spawning Stock Biomass Based on HRG Monitoring Program Egg Index (K. Hattala, NYSDEC)

DEC’s Hudson River Fisheries Unit has been monitoring shad with in- river tagging studies for past few years. Have seen which habitats they are found on in spawning grounds….

(A. Higgs, NYSDEC) mud gravel  sand

Habitat studies of larval American shad by C. Nack Will follow up on hurricane impacts Revenge of the shad!

River Herring alewife blueback herring

State and US fishery statistics Fishing up Fishing down… !

River herring Compare U.S. shad and river herring catches – note difference in scales – factor of 10-20X higher R.H. Metric tons per year Shad

Just like American shad, the river herring catches in the 1880s were greatly reduced from earlier times…but how much reduced? Records from a single river (Potomac) – upwards of 20 million shad/year caught

Data assembled by NYSDEC

Mohawk River blueback

 Collecting blueback herring in Hudson & Mohawk, Collecting blueback herring in Mohawk, 2012 Photo: Scott Wells

Males Females N = 73 N = 81 N = 159 N = 70 Sex ratios have skewed too

Current consensus – 1 st coast-wide stock assessment completed for ASMFC (2012)

The Striped Bass

Maine to N. Carolina Source: ASMFC

ASMFC coast-wide management restrictions put in place Source: NYSDEC A good news story, for a change!

Recent studies by Dave Secor et al. tracking where HR stripers come and go…

The American Eel

Regional Indices: Hudson River

Glass eel “product” “… pieces (glass eels) per kg, depending on time of season ordered” Region wide, some causes of eel decline: Lucrative!! $2600/lb (2012) Nematode infection rate (Anguillicola crassus) Photo and data: Wendy Morrison

ASMFC eel technical review board, 2006 Hydropower impacts? Glooskapandthefrog.org

*not including dams missing dates Dams Over Time* Source: Swaney et al. (2006), in Hudson River Fishes and Their Environment

Total Length, cm Number of eels caught in ladder trap Sizes of eels caught in ladder trap Experimental eel ladder – operated by Bob Schmidt & colleagues on Saw Kill since 2006

Citizen Science: The Art of Engaging Folks in GLASS EEEEELS! (monitoring, that is) Photos: NYSDEC; and two facebook sites

What about the other 205 species logged in for the Hudson River estuary? news.nationalgeographic.com

…and the new-ish, “Gang of 20” – the non-native predators…with little to no information about their status!