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April 4-April 10, 2025 – There were 19 reported site visits in the past seven days with 19 samples collected. Algal bloom conditions were observed by samplers at 11 of the sites.

Satellite imagery for Lake Okeechobee from 4/3 is partially obscured by cloud cover and shows scattered low to moderate bloom potential primarily along the western shore of the lake.

The most recent usable satellite imagery for the Caloosahatchee Estuary from 4/1 is partially obscured by cloud cover and shows scattered low bloom potential in the visible portion of the upper estuary.

The most recent usable satellite imagery for the St. Lucie Estuary from 4/1 is partially obscured by cloud cover and shows no bloom potential.

Satellite imagery for the St. Johns River from 4/3 is partially obscured by cloud cover and shows scattered low to moderate bloom potential on visible portions of Lake George and the mainstem of the St. Johns River downstream to Jacksonville.

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 4/8-4/10, Florida Department of Environmental Protection (DEP) staff collected 12 Harmful Algal Bloom (HAB) response samples. Dominant algal taxa and cyanotoxin results follow each waterbody name.

Lake Minnie — South Dock: Microcystis aeruginosa and Aphanizomenon flos-aquae co-dominant; no cyanotoxins detected.

Lake Winnott — Bakers Acres Drive: Aphanizomenon sp. and Dolichospermum sp. co-dominant; trace level [0.11 parts per billion (ppb)] of microcystins detected.

Lake Sampson — Rowell and Sampson Canal: Microcystis aeruginosa and Dolichospermum planctonicum co-dominant; trace level (0.96 ppb) microcystins detected.

Lake Crago — by Boat Ramp: Microcystis aeruginosa and Dolichospermum circinale co-dominant; an estimated 1.7 ppb microcystins were detected.

Parker Crago Canal: Microcystis aeruginosa; an estimated 1.0 ppb microcystins were detected.

St. Johns River — C.S. Lee Park Boat Ramp: Microcystis wesenbergii; no cyanotoxins detected.

Lake Killarney — Killarney Drive: Microcystis aeruginosa; trace level (0.94 ppb) of microcystins detected.

Lake Hancock — South Central: Microcystis aeruginosa; trace level (0.34 ppb) of microcystins detected.

Georges Lake — Center: Microcystis aeruginosa and Aphanizomenon flos-aquae co-dominant; trace level (0.32 ppb) of microcystins detected.

Georges Lake — Boat Ramp: Microcystis aeruginosa and Aphanizomenon flos-aquae co-dominant; trace level (0.38 ppb) of microcystins detected.

Alligator Lake — Safety Harbor Boat Ramp: No dominant algal taxon; no cyanotoxins detected.

Curve Lake — Southeast: Results pending.

On 4/8-4/10, St. Johns River Water Management District staff collected seven routine HAB monitoring samples. Dominant algal taxa and cyanotoxin results follow each waterbody name.

St. Johns River — Mandarin Point: no dominant algal taxon; no cyanotoxins detected.

Doctors Lake — Center: No dominant algal taxon; no cyanotoxins detected.

St. Johns River — Shands Bridge: No dominant algal taxon; no cyanotoxins detected.

Lake George — Center: Microcystis aeruginosa; no cyanotoxins detected.

Lake Monroe — Center: Raphidiopsis raciborskii; no cyanotoxins detected.

Crescent Lake — mouth of Dunns Creek: Results pending.

Lake Jesup — Center: Results pending.

Last Week

On 4/3, DEP staff collected seven HAB response samples. Dominant algal taxa and cyanotoxin results follow each waterbody name.

Blanton Lake — South Lobe: Microcystis aeruginosa and Botryococcus braunii were co-dominant; trace level (0.46 ppb) anatoxin-a detected.

Big Gant Canal — Boat Ramp: Microcystis aeruginosa; no cyanotoxins detected.

Lake Big Econ — Barr Street: Microcystis aeruginosa; no cyanotoxins detected.

Little Big Econ — Canoe Launch: Microcystis aeruginosa; no cyanotoxins detected.

Little Econ River — Riverside Park: Microcystis aeruginosa; no cyanotoxins detected.

Little Big Econ River — Jay Blanchard Park: Microcystis wesenbergii; no cyanotoxins detected.

Lake Cherokee — Southeast Shore: No dominant algal taxon in DEP sample and unidentified picoplankton and flagellates dominant in the Florida Fish and Wildlife Commission (FWC) sample; no cyanotoxins detected.

On 4/3, FWC collected a HAB response sample at Sapphire Lake. There was no dominant algal taxon and a trace level (0.20 ppb) of cylindrospermopsin 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, Apr 11, 2025 - 03:08pm