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These ships also risk causing turbidity, making the water opaque by stirring up the seafloor, and thereby harming the balance of species and food pyramid.

Worldwide, the turbidity of many coastal waters has been declining for decades, making the tidal flats sensitive to loss.

In October, they placed 20 sensors off West Maui that measure temperature, salinity, oxygen, turbidity and chlorophyll every five minutes.

Such action could expose cables to more abrasion or suspensions above the seabed, as well as trigger submarine landslides and greater turbidity.

In 2021, about 500,000 salmon died at the Florida facility after a clogged drain increased turbidity that may have generated deadly gases.