New Study Shows Deep Sea Fish are Eating Plastic A study by the National University of Ireland in Galway show 73 percent of deepwater fish in North Atlantic Ocean have eaten plastic. The plastic particles, called microplastics, often float to the top of the water where deeper fish come up to feed. Tom Doyle, a marine biologist and co-author of the study One of the fish that was studied measured at less than two inches long but had 13 pieces of microplastic in its system. Tom Doyle, a marine biologist and co-author of the study