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These analyses found that copepod nauplii in Passamaquoddy Bay contributed significantly to total copepod grazing ( 25 - 54 % ) , and production ( 10 - 50 % ) . During a simulated bloom of diatoms the importance of two of the mechanisms by which copepods produce DOC was investigated in relation to the copepod grazing activity . In contrast , copepod vertical distribution was not affected by intermittent hypoxia and anoxia . At the front , shearwaters foraged on euphausiids as expected , and on copepods that accumulated in the area . One kind of copepod is called a cyclops . The copepods feed on plants called phytoplankton , which bloom when water temperatures rise . In order to define the niche of copepod nauplii relative to copepodites and explain previously observed differences in food limitation between stages , several aspects of copepod naupliar feeding and growth were evaluated both experimentally , using the copepods in Passamaquoddy Bay , NB , and by reviewing previous studies . Midge larvae eat copepods and daphnia . The seasonal succession of the plankton community in Ellis Fjord was similar to that commonly observed in the wider Southern Ocean ; changing from dominance by microplanktonic diatoms and small herbivorous copepods during early summer to nanoflagellates and protozoa during late summer . Part of this cycle was apparently solved and the copepod Paracarcia grani is more than suspected to act as an intermediate host since the parasite could be transmitted from infected oysters to healthy copepods .