Some obsevations on swarms and mating behavior of Antarctic krill (Euphausia superba DANA)
During the cruise of SIBEX I, the authors seized a chance to observe a krill swarm in the pool made by icebreaker in the ice zone and the krill's mating behavior which has never been reported from the Antarctic Sea. A swarm was observed on December 27,1984. It began to appear at 2000LT with a p...
| Main Authors: | , , |
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| Format: | Report |
| Language: | English |
| Published: |
National Institute of Polar Research/Faculty of Agriculture, Tohoku University/Tokyo University of Fisheries
1986
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| Subjects: | |
| Online Access: | https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1887 http://id.nii.ac.jp/1291/00001887/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1887&item_no=1&attribute_id=18&file_no=1 |
| Summary: | During the cruise of SIBEX I, the authors seized a chance to observe a krill swarm in the pool made by icebreaker in the ice zone and the krill's mating behavior which has never been reported from the Antarctic Sea. A swarm was observed on December 27,1984. It began to appear at 2000LT with a peak at 2100LT when the density was 195krills/m^2,and disappeared at 2200LT. The mating behavior was observed in the low density swarm on December 28. The mating occurred only at the surface when the male chased the female and grasped it in the form of letter T. Both swam in a circle of 2-3m in diameter maintaining the T form for about 10s. One female was chased 2-3 times by different males before mating. |
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