Related by context. Frequent words. (Click for all words.) 62 sonar 52 marine mammals 44 endangered whales 44 bottom trawling 42 anti submarine warfare 41 whales 41 cetaceans 39 coastal waters 39 strandings 38 porpoises 38 dolphins 38 bycatch 38 marine mammal 37 sonic booms 37 humpback whales 37 domoic acid 37 bottlenose dolphin 37 subsonic 36 shallow waters 36 mammals 36 echolocation 36 harbor seals 36 orbiting satellites 35 orcas 35 chemical dispersant 35 pilotless aircraft 35 sea lions 35 humpbacks 35 ambient noise 35 frequency 35 dispersants 35 vibration 35 supersonic 34 whales dolphins 34 dugong 34 Marine Mammal Protection 34 air pollution 34 infrared laser 34 minke whale 34 NOAA Fisheries Service 33 National Marine Fisheries 33 whaling 33 decibels 33 LRAD 33 ocean swells 33 electromagnetic radiation 33 seabirds 33 submarines 33 particulate pollution 33 sperm whales 33 decibel 33 frequencies 33 Sonar 33 gray whales 33 gill nets 32 fine particle pollution 32 whale sanctuary 32 littoral 32 seabed 32 chemical dispersants 32 bottlenose dolphins 32 decibel levels 32 detonations 32 oxygen depletion 32 dBA 32 seal pups 32 porpoise 32 noise 32 radio transmitters 32 minke 32 emissions 32 humpback 32 harp seals 31 pollutant emissions 31 NOAA Fisheries 31 Antarctic waters 31 NMFS 31 VHF 31 scramjet 31 shorebird 31 dugongs 31 seabird 31 marine sanctuaries 31 mammal 31 marine ecosystem 31 whale 31 fur seals 31 ROVs 31 sonic boom 31 tinnitus 31 marine ecosystems 31 dispersant 31 emergency beacons 31 commercial whaling 31 electromagnetic fields 30 tidal 30 hertz 30 minke whales 30 warplanes 30 airborne pollutants 30 radiation emitted