What's on the menu for eels?

The American eels (Anguilla rostrata) are known to reside in the Hudson River. The Hudson River's water quality plays an important role on how fit the environment is for the American eel. The eels may eat bivalves, non-crab crustaceans, crabs and worms. We wonder how do water quality factors influence the biodiversity of American Eel Prey? We hypothesize that if the Hudson River has stable water quality, then there will be an abundance of prey, showing that the Hudson is providing a good food source for American Eels.