SS1.04 Small-scale Biophysical Coupling in Plankton Ecology
Date: Thursday, June 13, 2002
Time: 4:15:00 PM
Location: Esquimalt
 
TanakaY, Tokyo University of Fisheries, Tokyo, Japan, ytanaka@tokyo-u-fish.ac.jp
Wittke, E, , Tokyo University of Fisheries, Tokyo, Japan, ewittkejp@yahoo.com
Maezono, H, , Tokyo University of Fisheries, Tokyo, Japan, zono@xc5.so-net.ne.jp
 
LIVE CLOSE UP OBSERVATIONS OF EUCALANUS FEEDING AND SWIMMING BEHAVIOR
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As little has been known on the behavior of Eucalanus, a genus of copepod, we started an investigation of the appendage structure, feeding behavior and potential vertical migration. Obtaining live Eucalanus collected from Sagami Bay, central part off the Pacific coast of Japan, we made close observations of the appendage structure and feeding methods, while maintaining the copepod in microscopic focus by tethering to a hair. A dissection microscope was used with high-speed and regular video equipment. Observations of the 2nd antennae suggested that they are used for floatation and swimming, while the maxilliped is used for prey capture and manipulation, similar to that of Pareuchaeta norvegica, a well studied carnivorous copepod. Eucalanus is believed to be a vertically migratory animal judging from its lipid storage ability and size, which would be more energetically favorable; and make it a favored fish food such as Neocalanus plumchrus. During the rearing of these animals, unreported observations have been made. We will show the video images of its peculiar habits.