A direct counting method was used to estimate in situ grazing capacity of zooplankton grazing on phytoplankton in the marine shrimp ponds located in Haiyiang city,Shandong Province.The results showed that the total clearance rate of zooplanktonic community is 80 38ml/(L·h),i.e.11 13μl/(ind·h),the total grazing rate is 10 50μgC/(L·h),i.e.1 25ngC/(ind·h).Zooplankters grazed most effectively on phytoflagellates such as Cryptomonas ovata,Navicula sp., Platymonas cordiformis and Cyclo...