The cenotes are usually filled with rather cool fresh water.
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Most Cenotes are back-filled with deep seawater which travels inland via subterranean rivers leading to the bottoms of the sinkholes. Between fresh and saltwater, the flows mix in a curious zone called the halocline. There is even a hidden underwater river with fallen trees in Cenote Angelita.
Flora and fauna of a cenote are unique. There are species of fish such as guppy and catfish, as well as some varieties of marine crustaceans. In the cave cenotes inhabit fish such as White Blind Lady or the Yucatecan Blind Eel, both endangered.
Most cave cenotes have fresh water that has been meticulously filtered by the earth, making them so clear and pure that you can see straight through to small fish frolicking amidst the plant life below.
Quintana Roo cenotes are a tourist attraction of sorts because they stay so clean due to the natural filtration process and thanks to the plants inside. In fact, the abundance of plant life in the Mayan jungle helps clean out all impurities before they even reach the surface.
This week, tourists have been warned to take precautions when visiting cenotes in the Mexican-Caribbean, after E Coli bacteria were found in 6 of the most-visited spots. The cenotes with the highest rate of bacterial infection were found in Tulum, at the Cristal, Calavera and Casa Cenotes.
Why are there Cenotes in Mexico? There are many cenotes in the Yucatan peninsula of Mexico because of the geology of the region. The rocks are limestone and have eroded over a very long time.
As the name implies, cenotes are natural freshwater sinkholes caused by the collapse of limestone rock. As a result, we can now admire these hidden pools that were once beneath the ground. The origin of the caves and cenotes of the Yucatan Peninsula is a heritage that goes back centuries.
According to the Directorate for Protection Against Sanitary Risks of Quintana Roo, also known by its Spanish acronym of COFEPRIS, a significant amount of bacteria, such as Escherichia Coli, commonly known as E.Coli, has been found in at least three cenotes close to Tulum and surrounding areas.
Diving in general may be dangerous if it is not done the proper way. An experienced cenote guide is more than recommended. And that's why we are diving only with certified divers. The overhead environment itself is not a hazard in cavern diving.
Bull sharks can also swim in freshwater and seek its feeling. They are drawn to the freshwater cenotes pump out into the sea nearby the dive site and also the abundant food supply of fish and turtles in the area. Don't miss this amazing experience and enjoy diving with bull sharks in Mexico.