Related by context. Frequent words. (Click for all words.) 63 Eurasian milfoil 63 mud snails 61 mud snail 60 spartina 60 pondweed 59 biting midges 59 quaggas 59 tunicates 59 Phragmites 59 Milfoil 59 rusty crayfish 58 cordgrass 58 reed canary grass 58 Zebra mussels 57 gastropods 57 Hydrilla 57 Didymo 57 invasive mussels 57 Japanese Knotweed 57 tiger muskies 56 aquatic weeds 56 amphipods 56 Garlic mustard 56 loosestrife 55 Invasive species 55 flatworm 55 round gobies 55 salvinia 55 frogs salamanders 55 tui chub 55 invasive insect 55 flea beetles 55 invasive weed 55 mealybug 55 aquatic weed 54 quagga mussel 54 Gypsy moth 54 Quagga mussels 54 alga 54 giant salvinia 54 zebra mussel 54 killifish 54 fireweed 54 leafhoppers 54 Emerald ash borer 54 baleen whale 54 sea squirt 54 invasive species 53 Cyanobacteria 53 Rotenone 53 Eurasian watermilfoil 53 Spider mites 53 cabbage palms 53 Scientists theorize 53 sea lampreys 53 Methylmercury 53 intertidal zone 53 sea squirts 53 freshwater ponds 53 Gypsy moths 53 shortnose sturgeon 53 zebra mussels 53 tansy 53 snakehead fish 53 hatchery trout 53 americanus 53 naturally occurring bacteria 53 salination 52 weevils 52 leopard frogs 52 duckweed 52 Sea otters 52 moth larvae 52 Invasive plants 52 saltcedar 52 embayment 52 insects spiders 52 pocket gophers 52 native brook trout 52 Thoroughly cooking 52 invasive beetle 52 Penicillium 52 voracious predators 52 tent caterpillars 52 freshwater mussels 52 mussels 52 Phytophthora ramorum 52 phosphorus runoff 52 beetle larvae 52 Toxoplasma gondii 52 Sockeye salmon 52 Coho salmon 52 tiger salamanders 51 varroa mites 51 leaf beetle 51 riparian zones 51 mosquitofish 51 Phytophthora 51 quagga 51 acidify 51 whitefly