一例水牛氟乙酰胺中毒的病理观察

THE PRIMARY PRODUCTIVITY OF PHYTOPLANKTON IN LAOJIANGHE LAKE AND ITS CORRELATION WITH VARIOUS ECOLOGICAL FACTORS

水牛猝死症是近年来研究较多的课题之一，研究结果证实，其猝死病因一是某些传染病。如牛出败，链球菌，魏氏梭菌等；另一方面，很多情况下都是由于中毒所致。据华中农业大学畜牧兽医学院统计，１９９３～１９９７年水牛突然死亡７５例中，中毒性疾病５２例，占６０３％...

The primary productivity of phytoplankton was surveyed in Laojianghe Lake, Hubei Province from June, 1991 to April, 1993. The results showed that the gross primary productivity of phytoplankton in the water reached(O2) 1.56/gm-2d-1 in average during the time of investigation and (O2) 2.17/gm-2d-1 in average during the period from April to October, 1992. The potential annual production of silver and bighead carps may be 132.9 t. Temperature, transparency, inorganic nitrogen and phosphorus are the major limiting factors for primary productivity in Laojianghe Lake.