ADDITIVES FOR CRUSTACEAN OR FISH FEEDS AND FEEDS

摘要

Additives for crustacean or fish feeds having an immunopotentiating andinfection-preventing effects, characterized by containing asthe active ingredient a low-molecular weight lipopolysaccharide which isobtained from gram-negative microbial cells, has a molecularweight of 5000~2000 when measured by the SDS-PAGE method with the use ofprotein markers, and is substantially free fromhigh-molecular weight lipopolysaccharides; and crustacean or fish feedscharacterized by containing these additives.