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Health Recommendations
Often mistakenly called ?blue-green algae,? these microorganisms can give the water a bright green, blue-green, or turquoise tint. They sometimes appear as clumps resembling paint, foam, or a greenish slime on the surface. In several departments, their presence has already led to access restrictions or health advisories.
The affected fishermen
Anglers are directly affected. When water appears abnormally colored or has greenish deposits, it is best to avoid staying in the area, whether by boat, float tube, canoe, or paddleboard. After each outing, equipment, boots, landing nets, and boats must be thoroughly rinsed with clean water to minimize any prolonged contact with potential toxins.
Do not eat the fish
Caution is also advised regarding fish consumption. Certain cyanobacteria produce toxins that can accumulate in the food chain. As a precaution, it is recommended not to consume fish from areas where a significant bloom has been reported. If you plan to store fish, it is best to gut and remove the head promptly before eating or freezing it. However, cooking or boiling does not destroy these toxins.
What are the signs?
There are several warning signs to watch for: bright green, blue-green, or turquoise water; floating patches; green foam or scum; unusual problems; and, sometimes, an unpleasant odor. If you notice any of these signs, it is best to move to a different area and avoid any contact with the water.
No magic solution
The growth of cyanobacteria is promoted by heat, stagnant water, intense sunlight, and excess nutrients such as phosphorus or nitrogen. In the long term, combating this problem requires improving water quality, reducing agricultural inputs, and restoring riverbanks. However, there is no magic solution: chemical treatments are prohibited, and mechanical interventions remain largely ineffective on a large scale.
