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Sound the alarm: motorboat disturbance to fish embryos depends on engine type

When asked to consider aquatic pollution, we may first think of rubbish. Noise from boat engines may not immediately come to mind. But, humans have been altering the world’s natural acoustic background with increasing intensity since the Industrial Revolution. The 20th century invention of the marine engine, coupled with a recent spike in ecotourism to remote destinations, means many aquatic species have been hit hard by punctuated increases in noise without time to adapt. A recent study from Sofia JainSchlaepfer and her colleagues (2018) from James Cook University in Australia and Exeter University in the UK found noise from boat engines represents a dangerous stressor for developing fish embryos. Interestingly however, not all boat engines are created equal.