The development of breeding methods, especially for feeding, is still at a delicate stage.  Work carried out to date has enabled techniques to be radically improved.  However, they need to be refined in order to increase efficiency and reduce costs.

A great deal of handling and supervision is required in breeding larvae up to the stage of alevins that can be released into their natural environment.  The growth of these alevins to the reproductive stage requires space and daily care over the long term (12 to 15 years) which has lead to new breeding facilities being envisaged, in France or in other European countries.  The multiplication of these facilities aims principally at reducing risks: accidents that occurred several years ago are a reminder of the vulnerability of the current system, which is concentrated in one establishment in France that houses the great majority of fish available.  Although this concentration provides certain guarantees for the conservation of the stock that is difficult to divide into several lots due to its lack of numbers, efforts are required to render these facilities entirely secure, especially in relation to accidents of external origin.

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