Question regarding the lagoon at Barra de Potosí

Ceratopogonidae, commonly known as biting midges or no-see-ums, are a family of small flies in the order Diptera. They are known for their tiny size (1-4 mm) and the fact that only the females bite, requiring blood for egg production. These insects are found in various aquatic and semi-aquatic habitats worldwide, and their bites can cause itchy welts or blisters. Or if it's in the water Swimmer's itch is an allergic reaction to tiny parasites that burrow into your skin while you're swimming or wading outdoors.