Friday, August 17, 2018

Encountering the Red Tide

Since we had a wedding to attend in South Carolina in mid August, we decided to spend the second half of this month at our condo on Longboat Key, Florida.  Unfortunately, in the weeks leading up to the wedding, we learned that a severe and persistent red tide had developed along the coast of Southwest Florida.  Nevertheless, we decided to investigate for ourselves.

A toxic algal bloom of Karenia brevis, a red tide results in extensive fish kills, littering the beaches with rotting fish; a neurotoxin released by the algae may also kill dolphins and manatees and, this year, the corpse of a whale shark washed ashore.  In addition, particulate debris from the abundant algae wafts in on the sea breeze, causing eye, throat and lung irritation for those humans who do not abandon the region altogether.

We arrived to find that the dead fish odor was indeed strong along the beaches but that the wind-blown irritants were rather mild.  Though we will likely depart earlier than planned, we'll limit our beach walks and focus our activities on the bay side of the island, which seems to be less affected.  Of note, the Mote Aquarium, in Sarasota County, has developed a method to kill the algae by injecting ozone into the water; now used to protect their tanks, they will try this method in canals before experimenting in the open Gulf.  On the other hand, since a bloom of Karenia brevis is a natural phenomenon, one wonders whether such treatment will have unintended consequences.

See also: Red Tide in January