Related by context. Frequent words. (Click for all words.) 65 quagga mussels 63 zebra mussels 63 zebra mussel 58 Zebra mussels 52 aquatic invasive species 52 invasive species 51 steelhead trout 51 cutthroat trout 51 mussels 50 milfoil 50 nonnative species 49 aphid 48 invasive weeds 48 Chinook salmon 48 sauger 48 Delta smelt 48 species 48 rainbow trout 48 weevils 47 didymo 47 plover 47 chinook salmon 47 steelhead 47 silver carp 47 nematode 47 kokanee 47 lake trout 47 desert tortoise 47 bull trout 46 parasite 46 tamarisk 46 lamprey 46 sea otters 46 otters 46 brook trout 46 coho salmon 46 otter 45 hatchery fish 45 brown trout 45 sea urchins 45 cheatgrass 45 coho 45 bighorn 45 vole 44 zooplankton 44 smallmouth bass 44 feral pigs 44 largemouth bass 44 trout 44 cane toad 44 weevil 44 northern pike 44 aquatic vegetation 44 plovers 44 Africanized bees 44 toxic algae 44 alewives 44 invasives 43 mollusks 43 salamanders 43 delta smelt 43 sea otter 43 interbreeding 43 snakeheads 43 snails 43 organism 43 beetle 43 sturgeon 43 mosquito larvae 43 Asian Carp 43 beetles 43 nonnative 43 crayfish 43 critters 43 nematodes 43 overwintering 43 insect 43 pathogen 43 mussel 43 chub 42 midge 42 cyanobacteria 42 eelgrass 42 insect pests 42 mosquito populations 42 gypsy moth 42 organisms 42 chinook 42 Cryptosporidium 42 algal 42 freshwater 42 hydrilla 42 mammal 42 Invasive Species 42 moth 42 striped bass 42 genetic diversity 42 gypsy moths 41 snakehead 41 barred owl 41 bullfrogs