Deadly Effects Of Red Tide on Scallops through the Gulf Coast

Ride Tide Effects on Scallops

Port St. Joe is known for its scallops. Due to the Red Tide the scallop population has been depleted greatly. It is said to be the worst break out of red tide that has been seen in over a decade.


What is Red Tide

Red Tide is the blooming of the microorganism algae, called Karenia Brevis, in the waters of Bay and Gulf counties.

During red tide blooms, the toxins produced by K. brevis are also filtered by the scallops and accumulate in their gut. Scallop harvest zones are managed by the Florida Fish and Wildlife Conservation Commission who will close certain scallop harvest areas in response to red tide blooms.


What Does Red Tide do?

The red tide organisms produces a toxin that affects the central nervous system of fish, birds, mammals and other animals. The red tide is extremely toxic and deadly to animals. When red tide develops it typically can wipe out thousands of helpless animals, sea life, and eco-systems.


Where to go scalloping - Steinhatchee

Importance of Scallops with in an Ecosystem

Bay scallops are sensitive to changes in water quality and can be an indicator of an ecosystem's health. Scallops are filter feeders, and eat plankton. They lie on the bottom or on seagrass blades and filter water across their large gills, which remove food particles such as algae and oxygen for respiration from the water. Scallops need clean high salinity water to thrive; the water must be low in sediment content as the scallop is not efficient at removing sediment.

Unfortunately, coastal development in Florida has resulted in progressive declines in water quality and seagrass beds. Many high salinity estuaries and coastal lagoons such as Tampa Bay and Charlotte Harbor/Pine Island Sound have lost much of their seagrass and seen drastic declines in both water quality and scallop populations. In combination with over harvest of scallops in remaining healthy populations, the bay scallop is in serious danger of becoming a memory in Floridan coastal waters.

Sea Sponge and Red Tide

This is a sea sponge that was detached from the oceans bottom & unfortunately dying.


What Is Happening to Scallops as a Result of Red Tide

Due to the massive destruction of the Red Tide through 2017 and 2018, the TDC conducted many beach cleanups to remove the more massive concentrations of dead animals, which included everything from pinfish to octopus that washed up on the shore lines.

Today, the red tide is said to be under control, but the damaging affects still linger through out the under water eco-system. One of the heaviest hit sea creature population is scallops.

The scallop populations have diminished in St. Andrews and St. Joseph's Bay. Over the past few years scientists have noticed a decline in reproduction that has also contributed to the decline in the scollop population. To solve the issue of a scallop shortage, scientists have gotten creative.


Scalloping in Port Saint Joe

What Are Scientist Doing About It?

The FWC and volunteers created over 100 scallop cages. Right now, FWC has 650 scallops gathered in 3 pairs of cages which it hopes will spawn more scallops this fall. In addition to current restoration efforts, FWC will gather more scallops in more cages prior to the scallop season starting August 22nd.

The cages are part of a 10 year scallop restoration program across the entire panhandle. It is funded through a Natural Resources Damage Assessment (NRDA) Grant. The decrease in the scallop population could be due to a mix of over harvesting, red tides, climate changes. Another possible factor that has been debated, is the reduction of sharks from overfishing. A variety of sharks used to feed on rays, which are a main predator of bay scallops. With the shark population reduced, the rays have been free to feed on scallops to the point of greatly decreasing their numbers. Scientist want to help rebuild the scallop population and protect them from these occurrences.