Are there predators in the Hudson River?

Predators like blue crabs and sturgeons do eat zebra mussels, but have never been shown to control natural populations. Research on new control measures, including biological controls, is ongoing, but the changes we've seen to the Hudson's ecosystem probably are irreversible or at least long-lasting.



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Conservation priorities include: Brackish and freshwater tidal wetlands that provide essential habitat for diamondback terrapins, fiddler crabs, rails and killifish, river otter, turtles, bald eagles and other raptors, marsh wrens and herons, crayfish and dragonflies and blackbirds.

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In July, a shark is reported in the Hudson River off 42nd Street. Police as far north as Poughkeepsie are warned.

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Hudson waters north of the dam to Hudson Falls are open to sports fishing on a catch-and-release basis only, and eating fish from any part of the river is discouraged, according to advisories from the state Department of Health.

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The Atlantic sturgeon is the largest fish in the Hudson River. Adults are often five to eight feet long.

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The Mississippi River This once pristine waterway is perhaps the most polluted in the United States. Part of the problem stems from agriculture. The Mississippi River traverses much of America's heartland, drawing no end of runoff from factory farms. Animal waste isn't the only problem.

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Here are the five most polluted rivers in the world.
  • Ganges River, India: The Ganges River is a highly revered waterbody among Hindus. ...
  • Citarum River, Indonesia: The Citarum River in Indonesia is the second most polluted river in the world. ...
  • The Buriganga River. ...
  • Yellow River, China: ...
  • Mississippi River, United States:


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General Electric dumped an estimated 1.3 million pounds of polychlorinated biphenyls (PCBs) into the Hudson River between 1947 and 1977. The PCB discharges came from two GE capacitor manufacturing plants located in Fort Edward and Hudson Falls, New York, about 50 miles north of Albany.

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For Your Health- In 1976, the Upper Hudson River was closed to fishing due to extremely high amounts of polychlorinated biphenyls (PCBs) in fish. These levels posed a high risk of possible harmful health effects in humans. Since 1976, the manufacture of PCBs has been banned and their use phased out.

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While there are orange individuals in the Hudson, these tend to be easy pickings for predators; one study of the diet of ospreys along the Hudson found that goldfish were a common prey of this fish-eating hawk. Thus the goldfish we catch are more likely to be olive green or brown than orange or gold.

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