Sandre stands for Service d’administration nationale des données et des référentiels sur l’eau, or National Service for Water Data and Common Repositories Management of France. The Sandre service establishes the common water data language of the French national Water Information System (SIE: Système d’information sur l’eau). Sandre is ...
• (n.) A Russian fish (Lucioperca sandre) which yields a valuable oil, called sandre oil, used in the preparation of caviare.
San'dre noun (Zoology) A Russian fish ( Lucioperca sandre ) which yields a valuable oil, called sandre oil , used in the preparation of caviare. 
pickerel, perch-like river fish, found in the Saône and Rhine.
perchlike freshwater fish
pike perch