The Junta de Andalucia today  prohibited all activities on the Istan lake

The ban comes after the sudden deaths of at least six dogs in this month.

The document explains that tests have found a cyanbacteria from the Phomidium family that could be responsible for the deaths. (a division of microorganisms that are related to the bacteria but are capable of photosynthesis).

The cyanbacteria produces toxins that can poison domestic animals and symptoms include gastroenteritis, fever and irritaction of eyes , skin, throat and respiratory functions.

The samples will now be sent for further tests to see if cyanbacteria is to blame for the unexplained deaths.