Local dolphins in the St. Johns River have been spotted with severe cases of skin lesions, indicating their immune systems are compromised. In these photos, a newborn calf is covered in lesions and also appears to have an orange algal-type mat growing on its rostrum (face) and dorsal fin. Unfortunately, this does not bode well for his/her survival. A similar algal-type mat was observed on resident adult dolphins at death.
There have been several recent reports on the east coast (in addition to the Gulf) of people spotting dolphins, manatees, and other marine wildlife with growths and fungi on them. These growths are attributed to red tide, which is an algal bloom that produces toxins that can kill marine organisms, taint shellfish, cause skin irritations, and even foul air. They can also cause respiratory issues in children and elderly.
Algal blooms naturally occur, however, scientists, fishermen, and outdoors-people have noticed that they have been increasing in size, intensity, and persistence in recent decades. This is attributed to the increase of foreign nutrients in coastal waters – which causes the algae to grow at an unnaturally fast rate.
I wanted to share some simple tips on identifying the algae and what you can do to help!
If you spot an algae bloom (like the one pictured), you can quickly report it by dropping a pin on the App “Water Rangers” https://app.waterrangers.ca/
Create a River Friendly Yard.
Whether you are in your car or boat or on foot, pay close attention to what is going on around you. Is dirt running off a construction site into a creek? Did you spot a fish kill or a broken pipe? Is someone illegally-dumping trash or pollution into a storm drain or directly into a river? Report these issues to your city works or state environmental agency (they should have a hotline).
Most importantly, keep children and pets away from blooms. Wash thoroughly if you have come into contact. And do not eat fish caught in bloom areas.
Posts are a combination of my own research, visits, and conversations, plus various information found around the web. I try to provide sources, but if you have specific questions, feel free to ask!