The effects of phytophagous fishes on phytoplankton primary productivity in a freshwater pond

the importance of recycling of algae in fish feces

and the species specific interaction with phytoplanktons were studied. Phaeopigment amounts in pond water and in feces of fish were compared. The reduction of chlorophylla into phaeopigments in the process of passing through the phytophagous fish intestines was analyzed

and used for a direct comparison of the production rates of phytoplanktons before and after intestinal passage.