I had the chance to watch (and participate!) as staff and volunteers walked into the East River and seined for different creatures. Brooklyn Bridge Park also has amazing views onto the river, beautiful playgrounds, and if you look hard and long enough, a thriving habitat of fascinating creatures. It's worth a trip. Enjoy the slide show, which details my visit.
About the Brooklyn Bridge Park Conservancy and the Environmental Education Center, click here.
About the difference between jelly fish and comb jellies, check out the Smithsonian National Museum of Natural History's Ocean Portal Site.
About how biological organisms are classified: a useful Wikipedia page with handy illustrations.