Related by context. Frequent words. (Click for all words.) 54 invasive species 48 aquatic invasive species 48 zebra mussel 48 inland waters 47 invasives 47 invasive pest 47 migrating waterfowl 47 species 47 Invasive species 46 round goby 46 invasive pests 46 Didymo 46 zebra mussels 46 migratory species 46 freshwater 45 aquatic ecosystems 45 Migratory birds 45 ballast water 45 migratory birds 45 ocean acidity 45 aquatic species 45 quagga 45 quagga mussels 45 wintering grounds 44 estuaries 44 marine turtles 44 marine ecosystems 44 migratory fish 44 habitats 44 migratory 44 migratory waterfowl 44 waterbirds 44 inshore waters 44 toxic algae 43 aquatic habitats 43 freshwater mussels 43 acidification 43 overwintering 43 quagga mussel 43 oceangoing ships 43 habitat fragmentation 43 contaminant 43 harmful algal blooms 43 viral hemorrhagic septicemia 43 coastal waters 42 insect populations 42 Zebra mussels 42 contaminants 42 chytrid fungus 42 nutrient runoff 42 highly pathogenic H#N# 42 leatherbacks 42 ecosystems 42 aquatic vegetation 42 hemlock woolly adelgid 42 adelgid 42 invasive alien 42 freshwater ecosystems 42 waterways 42 Steller sea lions 42 filter feeders 42 aquatic organisms 42 overhunting 42 colder temperatures 42 gypsy moths 42 warmer temperatures 42 eutrophication 42 mammals 42 biodiversity 42 aquatic ecosystem 42 emerald ash borers 42 Coho salmon 41 aquatic weeds 41 species extinctions 41 feral pigs 41 salmonids 41 algal bloom 41 Great Lakes basin 41 invasive weed 41 invasive aquatic 41 overfishing 41 Asian Carp 41 larval stage 41 algae 41 Asian carp 41 migrating birds 41 Cook Inlet belugas 41 algal blooms 41 migratory routes 41 marine organisms 41 Invasive Species 41 marine biodiversity 41 insect pests 41 biota 41 seagrasses 40 Asian citrus psyllid 40 migrating salmon 40 coastal ecosystems 40 gamefish 40 dugongs 40 Emerald Ash Borer