From Tidal Hudson River Regulations
"Fishery closed. Targeting American Shad is prohibited"
From General Regulations
Endangered and Threatened Fish
It is illegal to fish for, or possess fish that are officially listed by DEC as endangered or threatened:
Endangered: silver chub, bluebreast darter, deepwater sculpin, gilt darter, pugnose shiner, round whitefish, shortnose sturgeon, Atlantic sturgeon and spoonhead sculpin.
Threatened: eastern sand darter, lake chubsucker, lake sturgeon, longear sunfish, mooneye, gravel chub, banded sunfish, longhead darter, swamp darter, spotted darter and mud sunfish.
Any unintentionally caught threatened or endangered fish species must be unhooked and released immediately. They may not be handled for any purpose other than removing the hook and placing them back into the water.
So i would interpret that as pics are ok.
Clear as mud?