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May 23-May 29– There were 31 reported site visits in the past seven days with 31 samples collected. Algal bloom conditions were observed by samplers at 18 of the sites.

The satellite imagery for Lake Okeechobee from 5/29 is partially obscured by cloud cover and shows low to moderate bloom potential on approximately 40% of the lake.

The most recent usable satellite imagery for the Caloosahatchee Estuary from 5/28 is partially obscured by cloud cover and shows no bloom potential on visible portions of the estuary.

The most recent usable satellite imagery for the St. Lucie Estuary from 5/28 is partially obscured by cloud cover and shows no bloom potential on visible portions of the estuary.

The satellite imagery for the St. Johns River from 5/29 is partially obscured by cloud cover and shows low to moderate bloom potential throughout visible portions of Lake George and on the mainstem of the St. Johns River downstream to Clarks Creek, with cloud cover obscuring the rest of the river downstream.

Please keep in mind that bloom potential is subject to change due to rapidly changing environmental conditions or satellite inconsistencies (i.e., wind, rain, temperature or stage).

On 5/27-5/29, Florida Department of Environmental Protection staff collected 10 Harmful Algal Bloom (HAB) response samples. Dominant algal taxa and cyanotoxin results follow each waterbody name.

Caloosahatchee River — Rubicon Canal: Skeletonema sp.; no cyanotoxins detected.

Lake Killarney — Killarney Drive: Microcystis aeruginosa; no cyanotoxins detected.

Lake Sue — South Shore: Microcystis aeruginosa and Raphidiopsis raciborskii co-dominant; trace level [0.13 parts per billion (ppb)] of cylindrospermopsin detected.

Zephyr Waterway — South Gulf Cove: No dominant algal taxon; trace level (0.21 ppb) of cylindrospermopsin detected.

Dunns Creek — U.S. Highway 17 Bridge: No dominant algal taxon; trace level (0.34 ppb) of cylindrospermopsin detected.

Lake Sampson — Rowell and Sampson Canal: Microcystis aeruginosa and Raphidiopsis raciborskii co-dominant; no cyanotoxins detected.

Lake Crago — by Boat Ramp: Microcystis aeruginosa and Microcystis wesenbergii co-dominant; 2.1 ppb microcystins detected.

Parker Crago Canal: Microcystis aeruginosa; no cyanotoxins detected.

Lake Van — end of Lake Van Road: Microcystis aeruginosa; 0.44 ppb cylindrospermopsin detected.

Doctors Lake — Pace Island Back Park Dock: Results pending.

On 5/27-5/28, South Florida Water Management District staff collected three routine HAB monitoring samples. Dominant algal taxa and cyanotoxin results follow each waterbody name.

Lake Okeechobee — S308C (lakeside): Microcystis aeruginosa; no cyanotoxins detected.

C44 canal — S308C: No dominant algal taxon; no cyanotoxins detected.

C43 canal — S77 (upstream): Planktolyngbya contorta and Planktolyngbya limnetica co-dominant; no cyanotoxins detected.

On 5/27-5/29, St. Johns River Water Management District staff collected 11 routine HAB monitoring sample and six HAB response samples. Dominant algal taxa and cyanotoxin results follow each waterbody name.

Stick Marsh — North: No dominant algal taxon; no cyanotoxins detected.

Zigzag Canal — Northeast of Blue Cypress Lake: Microcystis wesenbergii; no cyanotoxins detected.

Blue Cypress Lake — Center: Microcystis wesenbergii; trace level (0.14 ppb) of microcystins detected.

Lake Monroe — Center: Microcystis aeruginosa and Planktolyngbya limnetica co-dominant; trace level (0.29 ppb) of cylindrospermopsin detected.

Lake Jesup — Center: Microcystis sp. and Raphidiopsis raciborskii co-dominant; no cyanotoxins detected.

St. Johns River — Mandarin Point: Microcystis aeruginosa; no cyanotoxins detected.

Doctors Lake — Center: Microcystis aeruginosa; 5.4 ppb microcystins detected.

St. Johns River — Shands Bridge: Microcystis aeruginosa; no cyanotoxins detected.

St Johns River — Racy Point: Raphidiopsis raciborskii and Planktolyngbya limnetica co-dominant; trace level (0.33 ppb) of cylindrospermopsin detected.

Fellsmere Water Management Area — Center: Microcystis sp.; trace level (0.43 ppb) of microcystins detected.

Lake George — Center: Microcystis aeruginosa and Planktolyngbya limnetica co-dominant; trace level (0.40 ppb) of cylindropspermopsin detected.

Dead Lake — Bull Creek Boat Ramp: Microcystis aeruginosa; 2.0 ppb microcystins detected.

Lake Weir — Carney Island Boat Ramp: Microcystis sp. and Botryococcus braunii co-dominant; no cyanotoxins detected.

St. Johns River — South of U.S. Highway 17 Bridge: Raphidiopsis raciborskii and Planktolyngbya limnetica co-dominant; trace level (0.23 ppb) of cylindrospermopsin detected.

Lake Washington — Center: Results pending.

Crescent Lake — mouth of Dunns Creek: Results pending.

Crescent Lake — South of Bear Island: Results pending.

On 5/28, Highlands County staff collected one HAB response sample at Lake Sebring — Boat Ramp. The sample was dominated by Aphanizomenon flos-aquae and had no cyanotoxins detected.

Results for completed analyses are available at FloridaDEP.gov/AlgalBloom. 

This is a high-level summary of the sampling events for the reported week. For all field visit and analytical result details, please refer to the complete algal bloom map with data table by clicking the “Field and Lab Details” Quick Link from the Algal Bloom Dashboard. Different types of blue-green algal bloom species can look different and have different impacts. However, regardless of species, many types of blue-green algae can produce toxins that can make you or your pets sick if swallowed or possibly cause skin and/or eye irritation due to contact. We advise staying out of water where algae is visibly present as specks or mats or where water is discolored pea-green, blue-green or brownish-red. Additionally, pets or livestock should not come into contact with algal bloom-impacted water or with algal bloom material or fish on the shoreline.

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Last Modified: Friday, May 30, 2025 - 02:54pm