The process of macrophage aggregation(MA) and histological changes were investigated and compared in the thymus, prorephros, spleen, liver and kidney of grass carp ?(Ctenopharyngodon idellus)? by intraperitoneal injection Indian ink at different time.

• 给草鱼腹腔注射细微炭粒（墨汁）后不同时间取样，比较观察了草鱼胸腺、肝、脾、头肾和肾组织中巨噬细胞集结（m acrophage aggregation ， M A）状况及相应组织的变化。