Related by context. Frequent words. (Click for all words.) 71 algae blooms 70 algal blooms 66 toxic algae 62 algal bloom 61 nutrient pollution 60 algae bloom 59 oxygen depletion 59 estuaries 58 algae 58 saltwater intrusion 58 polluted runoff 58 eelgrass 56 shellfish beds 55 dissolved oxygen 54 waterways 54 aquatic ecosystems 53 aquatic organisms 53 aquatic vegetation 53 cyanobacteria 53 alga 53 aquatic species 53 estuarine 53 ocean ecosystems 52 coastal waters 52 sewage overflows 52 plankton 52 domoic acid 52 hydrilla 52 coastal ecosystems 52 eutrophication 52 invasive species 52 coral bleaching 52 estuary 51 stormwater pollution 51 overharvesting 51 Overfishing 51 shellfish 51 salt marshes 51 Zebra mussels 51 oyster reefs 51 zebra mussels 51 sewage overflow 50 salinity 50 marine ecosystems 50 acidification 50 algal 50 reefs 50 shellfish harvesting 50 aquatic insects 50 marine ecosystem 50 Rip currents 50 toxins 50 mussels 49 pollutants 49 Estuary Program 49 pollution 49 overfishing 49 phytoplankton 49 Invasive species 49 marine organisms 49 contaminants 49 sewer overflows 49 shorelines 49 marine mammals 49 coral reefs 49 zebra mussel 49 sedimentation 48 hypoxia 48 zooplankton 48 fecal bacteria 48 jellyfish 48 mercury contamination 48 sediment 48 freshwater 48 menhaden 48 fecal coliform 48 aquatic habitat 48 wetlands 48 airborne pollutants 48 fish 48 shellfishing 48 seagrass 47 milfoil 47 bacteria 47 marine habitats 47 alewife 47 freshwater lakes 47 oyster beds 47 fisheries 47 dieback 47 marine ecology 47 seabirds 47 stormwater runoff 47 lakes 46 manatees 46 contaminate drinking 46 coastal wetlands 46 mollusks 46 gizzard shad 46 invasive weed 46 respiratory irritation