Hudson river American Shad:

[AndyS]

Commercial and recreational fishing for American shad is prohibited in the Hudson River and the Marine District of New York. Additional Research
2009-2012 Sonic Tagging Project
Tagged 174 adult American shad with sonic transmitters
Collected information on spawning areas, in-river residence times, and migration rates.
The American shad swims upriver to spawn every year in early spring. This large herring once supported the most important commercial fishery on the Hudson. However, its numbers have declined to the point where DEC had to close the fishery in 2010. The agency is implementing an American shad recovery plan to restore the population