News Release, University of Maryland
COLLEGE PARK,Md. — Public concern about the effects of underwater noise pollution on whales and dolphins has garnered attention in the media and the research literature over the past few decades. Much less attention has been devoted to understanding the impacts of noise pollution on fish. But fish depend on hearing and sound for survival, and activities that cause underwater noise pollution are on the rise.
“There are currently so many fundamental knowledge gaps on the potential effects of anthropogenic [human-generated] sound to cause harm in fishes, that it is almost impossible to reach clear conclusions about the impacts of many human activities,” said Arthur Popper, professor emeritus of biology at the University of Maryland. Popper is the lead author of a review paper on the effects of human-generated, or anthropogenic, noise on fish published on March 12, 2019 in the Journal of Fish Biology.
In the paper, Popper and co-author, Anthony Hawkins, former Director of Fisheries Research for Scotland and Coordinator of Fisheries Research for the UK, outlined what is known about the effects of anthropogenic noise on fish, identified large gaps in data and called for the development of criteria for sound exposure that can be used to inform regulations.
Short pulses of very intense sounds, from such things as explosions, pile driving and seismic surveys, can be physically harmful to fishes, causing short term impairment or even death in animals close to the sound source. But lower intensity sounds may also have a significant effect on underwater ecosystems.
Sound travels great distances through water and is an important component of the underwater environment. Fish use sound to communicate, navigate, forage, find prey and avoid predators. Activities such as shipping, offshore oil and gas exploration, dredging, trawling and other industrial pursuits may interfere with a fish’s ability to hear and respond to the natural sounds of its environment. Prolonged or continual sounds, such as those from shipping lanes, can have long-term effects on underwater soundscapes and cause behavioral changes in individual fish or whole communities.
It is clear that anthropogenic sound has the potential to impact fish and the ecosystems they live in, but according to the paper, very few studies of those impacts exist. Most were conducted in laboratories on species of fish that thrithrive in captive conditions. Wild fish behave very differently, and hearing sensitivity and frequency varies widely among the nearly 33,000 species of fish in the world. So, sounds will have different impacts on different fish species. What’s more, a multitude of conditions can affect the sound levels produced by a given activity, from topography and weather to the type of equipment used.
This new paper highlights the urgent need to examine the effects of different types of anthropogenic sounds on a variety of fish under varying conditions.
“Future research needs include investigations of how sound exposure might impair the ability of individual animals to survive, breed, reproduce, or rear young,” Popper said. “We need to quantify how this impairment may affect the abundance of the species concerned, as well as the extent to which sound affects the structure and functioning of fish populations and ecosystems, both marine and freshwater.”
According to the authors, research efforts should focus on developing criteria that define the levels of sound from different sources that are likely to negatively impact fish. From those criteria, informed regulations can be developed to manage noise in the aquatic environment.
“The goal must be to fill these gaps in our knowledge so that sound exposure criteria can be revised and improved,” Popper said.
To hear examples of different anthropogenic underwater sounds, go to: https://dosits.org/galleries/audio-gallery/anthropogenic-sounds/
The review paper “An overview of fish bioacoustics and the impacts of anthropogenic sounds on fishes”Arthur N. Popper and Anthony D. Hawkins was published online March 12, 2019 in the Journal of Fish Biology.
The Southern Maryland Chronicle is a local, small business entrusted to provide factual, unbiased reporting to the Southern Maryland Community. While we look to local businesses for advertising, we hope to keep that cost as low as possible in order to attract even the smallest of local businesses and help them get out to the public. We must also be able to pay employees(part-time and full-time), along with equipment, and website related things. We never want to make the Chronicle a “pay-wall” style news site.
To that end, we are looking to the community to offer donations. Whether it’s a one-time donation or you set up a reoccurring monthly donation. It is all appreciated. All donations at this time will be going to furthering the Chronicle through hiring individuals that have the same goals of providing fair, and unbiased news to the community. For now, donations will be going to a business PayPal account I have set-up for the Southern Maryland Chronicle, KDC Designs. All business transactions currently occur within this PayPal account. If you have any questions regarding this you can email me at firstname.lastname@example.org
Thank you for all of your support and I hope to continue bringing Southern Maryland the best news possible for a very long time. — David M. Higgins II