【摘要】 斜生栅藻对³²磷有很强的吸收积累能力,吸收率在98％以上。白鲢对用3种不同强度的³²磷标记的斜生栅藻中的³²磷也有较高的摄取率,平均在43.59—59.78％之间。³²磷在白鲢各组织中积累和分布的比放射性（specific radioactivity）大小顺序为:肠>肝>骨>肉>脑。白鲢各组织的总放射性（total radioactivity）大小顺序为:肉>肠>骨>肝>脑,肌肉中³²磷的含量占各组织中³²磷的48—70％,说明白鲢能消化吸收斜生栅藻。更多还原

【Abstract】 In order to find out whether unicellular green algae could be digested by silver carp （Hypophthalmichthys molitrix）, tracer experiments of ³²P were carried out. Scenedesmus obliquus （Turp） Kutz was cultivated in HB No. 4 medium containing ³²P of different specific activities （20 μCi/L, 30 μGi/L, 50 μCi/L） instead of ³¹P. After being cultivated for 72 hours, the algae were collected and their radio-activity was measured. The result showed that ³²P was absorbed and accumulated rapidly by Scenedesmus obliquus. The rates of absorption were all over 98%.The fish were fed with thoroughly-washed labeled algae. After feeding 48 hours, the fish were taken out of the water, dissected, and various tissue samples were prepared.The results showed that Scenedesmus obliquus could be ingested, digested and absorbed by silver carp. The rates of ingestion ranged from 47% to 63%. Different tissues have different capacity for assimilating and accumulating ³²P. According to the data at 48th hours （50μCi/L）, the specific radioactivity of ³²P accumulation were 4580 （intestine）, 650 （liver）, 609 （skeleton）, 118 （muscle）, 110 （brain） CPM/500mg. It is evident that Scenedesmus obliquus is not only ingested, but also digested and absorbed by silver carp. There is reason to think that unicellular green algae might play a more important role in the nutrition of silver carp than people used to believe.更多还原