Related by context. Frequent words. (Click for all words.) 57 Quagga mussels 57 Zebra mussels 57 fathead minnows 56 zebra mussels 56 freshwater mussels 56 sea lampreys 55 round gobies 55 E coli bacteria 55 aquatic insects 54 bacteria 54 Didymo 54 mussels 54 tiny crustaceans 54 deplete oxygen 54 bacterial spores 53 tadpoles 53 contaminants 53 Cyanobacteria 53 fungal spores 52 aquatic organisms 52 insects 52 redds 52 Rotenone 52 microorganisms 52 larvae 52 insect larvae 52 microscopic organisms 52 invasive mussels 52 brine shrimp 51 zebra mussel 51 blowholes 51 harmful pathogens 51 zooplankton 51 Milfoil 51 protozoa 51 lampreys 51 Soil samples 51 copepods 51 animal droppings 51 naturally occurring bacteria 51 mollusks 51 protozoan 51 stoneflies 51 microbes 51 microscopic algae 50 salvinia 50 sediment 50 toxic algae bloom 50 ash borers 50 microorganism 50 alga 50 mussel shells 50 organisms 50 planktonic 50 duckweed 50 adelgids 50 invertebrates 50 amoebae 50 dissolved oxygen levels 50 harmful microorganisms 50 aquatic weeds 50 garter snakes 50 bagworms 50 infectious prions 50 spores 50 Midges 50 giardia 49 native brook trout 49 bacterial colonies 49 algae 49 gizzard shad 49 bird carcasses 49 fish 49 whirling disease 49 pupfish 49 gobies 49 electrofishing 49 Salmonella bacteria 49 Hydrilla 49 parasitic worms 49 filter feeders 49 sea squirts 49 streambeds 49 mosquito larvae 49 giant salvinia 49 Eurasian milfoil 49 bacilli 49 Cryptosporidium 49 phytoplankton blooms 49 sediment samples 49 aquatic creatures 49 Dunkard Creek 49 Bacterium 48 Hydrogen sulfide 48 Spores 48 mouthparts 48 milfoil 48 microscopic 48 Giardia 48 plankton 48 steelies