If upwelling starts a month earlier than usual, the amount of oxygen, already low, has to last until the fall when storms promote mixing which adds oxygen back into the system. As of late September this year, upwelling is still occurring and low levels of oxygen are still persisting.

When Kathleen Reed descended for her usual weekly dive off the coast of Nanaimo, B.C., last Saturday she was shocked by how many dead sea cucumbers she saw. Experts and harvesters fear that sea cucumbers are being hit by an illness similar to sea star wasting disease.

A marine biologist at the University of British Columbia estimates that last week's record-breaking heat wave in B.C. may have killed more than one billion intertidal animals living along the Salish Sea coastline.

A record-shattering heat wave June 26-28 coincided with some of the year's lowest tides on Puget Sound. The combination was lethal for millions of mussels, clams, oysters, sand dollars, barnacles, sea stars, moon snails, and other tideland creatures exposed to three afternoons of intense heat.

The study shows the destruction of the kelp forest was related to an explosion in the population of purple sea urchin, which eats it, and two warm water events that lasted from 2014 to 2016.

Scientists first caught on to the strange event when they found thousands of purple sea urchins and other organisms dead in their laboratory tanks.