I personally head over to Ft totem myself for snails, shrimps and pods.. People capture butterflies, spadefish, gobies, pipefish, sea horses, pufferfish, burrfish, sea robins, stonefish, etc. using seine nets out on Long Island. The ocean is full of life. There are also different species of macro algae, which I collect, plus once time I picked up a spiny scallop, which settled in my tank. The most exotic thing I've collected, besides the listed stuff, was a 3 inch, striped remora, which was attached to a trigger, while fishing. The only parasites I've ever spotted, were copepod species, which are easily caught during in quarantine.