Variations in concentrations of dissolved sugars were studied along the salinity gradient of a smallestuary (Elorn, Bay of Brest, France) from February 1985 to January 1986. Total dissolved carbohydrate(TDCHO) and dissolved monosaccharides (MCHO) were measured by the methods of Burneyand Sieburth and Johnson and Sieburth respectively. It must be noted that these methods cannotdistinguish between carbohydrates and carbohydrate-like substances; consequently, these methodsprobably do not closely...