Over 1,500 dead fish were removed from a canal in the Sawgrass Lakes community of Port St. Lucie in August 2025, prompting an active investigation by the Florida Fish and Wildlife Conservation Commission and city officials. This significant fish kill event has raised concerns among residents and highlighted ongoing environmental challenges in the region.
Fish Kill in Port St. Lucie Sawgrass Lakes Canal
The fish kill in Port St. Lucie was first reported to authorities on August 13, 2025, according to city officials. Multiple reports were received from both residents and city staff regarding dead fish accumulating in the canal. The majority of the fish removed were tilapia, with smaller numbers of bluegill, catfish, bass, and bream also affected.
Officials from the Florida Fish and Wildlife Conservation Commission (FWC) and the City of Port St. Lucie responded by collecting water samples and initiating laboratory analysis to determine the cause of the incident. The dead fish were promptly removed to address health and odor concerns in the community.
Suspected Causes: Low Dissolved Oxygen and Algae
According to a preliminary report from the FWC, initial findings suggest that low dissolved oxygen levels are the primary suspected cause of the fish kill in Port St. Lucie. High summer temperatures and increased algae growth are believed to have exacerbated the situation.
Water samples collected from the canal showed the presence of cyanobacteria and dinoflagellates. Both types of microorganisms can contribute to oxygen depletion in water bodies, especially during periods of sustained heat. Algal blooms, particularly those involving cyanobacteria, are known to reduce oxygen and sometimes release toxins harmful to aquatic life.
Water Testing and Environmental Factors
City officials reported that oxygen levels in the canal were within normal ranges at the time of their testing. However, environmental factors such as prolonged high temperatures are still being considered as contributing elements. The canal is not a source of drinking water for residents, according to city statements.
No reclaimed water, wastewater, or chemicals had been released into the affected canal, and no herbicides had been sprayed in the area since 2022, according to city officials. This information was confirmed following a review of city maintenance records and environmental protocols.
Resident Concerns and Community Impact
Residents in the Sawgrass Lakes community have expressed concern about the potential health risks associated with the fish kill. The persistent odor from decaying fish has also been a source of discomfort. Increased scavenger activity, including vultures feeding on the dead fish, has been observed in the area.
City officials have maintained communication with residents, providing updates on the investigation and cleanup efforts. The city is awaiting further laboratory results to clarify the cause and determine any necessary remediation steps.
Previous Fish Kill Events in Port St. Lucie
The last significant fish kill of this scale in Port St. Lucie was reported in June 2020, according to city records. That incident occurred in a different canal and was also linked to environmental factors affecting dissolved oxygen levels.
Experts generally note that fish kills in Florida are most often associated with drops in dissolved oxygen, particularly during hot summer months when warm water holds less oxygen. Similar events have been reported elsewhere in South Florida during the same summer, indicating broader regional environmental stressors.
Ongoing Investigation and Next Steps
The Florida Fish and Wildlife Conservation Commission and city officials continue to investigate the fish kill in Port St. Lucie. Water samples have been sent to laboratories for further analysis, and additional updates are expected as more information becomes available.
Details may be updated as the investigation continues. Residents are encouraged to monitor official city communications for the latest developments regarding environmental safety and any recommended actions.
Frequently Asked Questions About Fish Kill in Port St. Lucie
What caused the fish kill in the Sawgrass Lakes canal?
According to the Florida Fish and Wildlife Conservation Commission, low dissolved oxygen levels, likely worsened by high temperatures and algae growth, are the main suspected causes. Water samples showed cyanobacteria and dinoflagellates, which can reduce oxygen in the water.
How many fish were affected in Port St. Lucie?
Over 1,500 dead fish were removed from the Sawgrass Lakes canal in August 2025. Most were tilapia, with some bluegill, catfish, bass, and bream also found.
Are there any health risks to residents from the fish kill?
City officials report that the affected canal is not a source of drinking water. While the odor from decaying fish can be unpleasant, no direct health risks have been identified at this time.
Can you fish or swim in the affected canal?
City officials recommend avoiding fishing or swimming in the affected canal until the investigation is complete and water quality is confirmed. Residents should follow any guidance provided by local authorities.
Where are other fish kill events happening in South Florida?
Similar fish kill events have been reported in other parts of South Florida during the same summer. These incidents are often linked to environmental factors like high temperatures and algae blooms.
