Neuraminsäure-Gehalt in Fischeiern verschiedener Entwicklungsstadien

Abstract

The content of neuraminic acid (NA) of different developmental stages of trout eggs was determined. 1. The total NA increases from about 13 μg NA per egg (6–8 weeks before spawning) to 50 μg directly before spawning until hatching. 2. In freshly hatched fish larvae the NA-content is decreased to about 40 per cent as compared with stages before hatching. 3. The ratio of bound to free NA decreases from values of about 13.5 (6–8 weeks before spawning) to 0.85–1.2 at the hatching-stage. 4. The bound NA is almost entirely bound to sialo-glycoproteins.