Jellyfish, diving with them in freshwater

Une lampe de plongée éclaire une méduses d'eau douce

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It is one of the pleasures at the end of the summer. To make fresh water dives in our countries of the North:

Jellyfish can also be found in fresh and cold water.

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The extraordinary encounter with the tiny freshwater jellyfish.

Craspedacusta sowerbii. The scientific name, they invade for a few weeks the fresh waters of quarries, lakes and rivers which present little or no current.

These small jellyfishes of maximum 2 cm in diameter and weighing only a few grams. Give themselves airs of flying saucers with their transparent bodies and their numerous tentacles used to catch their prey (zooplankton).

Une méduses d'eau douce dans un plan de carrière

Méduses d'eau douce : portrait en noir et blanc

Like every year. These strange creatures took possession of the cold waters of my favorite quarry at the end of August. (even if they had already settled there since mid July).

Helped by the rise of the temperature in july. The freshwater jellyfish have proliferated. To the point of constituting a thick layer of 2 to 3 m thick over tens of meters of circumference.

They have invaded everything and diving today in this quarry is similar to be immersed in an ocean of beautiful and wonderful small aquatic creatures. Harmless for divers. Water jellyfish do not bite or sting and diving suits protect the Divers from a possible allergic reaction (tingling)

This annual meeting is a magical moment for me and I fall literally in love in front of this extraordinary spectacle that I can admire for long minutes.

Diving in the middle of the jellyfish is a bit like finding oneself in the stars. Invaded by a sweet impression of flying among the Milky Way.

Of course, it is necessary to evolve with delicacy in order not to damage them. But it is difficult or almost impossible not to come into contact with those jellyfish. They proliferate each year a little more.

I then take advantage of all these wonderful diving moments. Because I know that soon, the freshwater jellyfish will contract until disappearing at our sight during the long winter time. During these months, Craspedacusta sowerbii will be forgotten and will allow us to marvel again next summer.

Good news for our bodies of water, this magnificent freshwater jellyfish lives only in unpolluted waters and presenting a neutral ph. It is therefore a sign of the health of the water bodies where the divers observe it.