24 January 2017 - Evénements


Technical conservation

The presentation of the aquariums, inaugurated in 1985, underwent a complete revision during the winter of 2009-2010 and the technical installations were renovated in 2011.

Today, the technical installations of the aquariums, at the cutting edge of technology, enable our guests to be kept in optimum conditions and ensure their wellbeing.

This further facilitates maintenance and is in keeping with current environmental criteria that encourage sustainable development (LED lamps, water-saving, no chemical filtration).


Whatever its origin, the water in which our fish live and evolve does contain dissolved substances – salts and organic materials. Its composition has an important role to play in the health of the inmates of our aquariums.

For reasons of maintenance costs and the risks of pollution, the water in the aquariums comes from a water supply system and functions with closed loop filtration.


The purpose of filtration is essentially to maintain the cleanliness of the water in the tanks, a sort of “highway maintenance”. Any alteration of the environment caused by decomposing uneaten food or excrements must be avoided.

The aquariums function well thanks to technical equipment adapted to tanks of this volume and using three types of filter: a bottom filter, external filters and a pre-filter, which ensure both biological and mechanical cleaning. They guarantee a constant level of the oxygen that the fish need in order to breathe but which is also required to allow the bacteria that ensure the biological regeneration of the water to survive. The levels, including that of carbon dioxide, are closely monitored so that the lighting and temperature regulation can be adapted in consequence.
In the Musée du Léman the water coolers are regulated so as to be in line with normal seasonal temperatures and their cycle. Since solar lighting is inadequate, especially in winter, artificial lighting is indispensable. The day-night cycle is respected and modelled as closely as possible on the natural cycle.