Swarm of euphausiids in the ocean
Euphausiids often form dense swarm in the sea. The surface swarms of Euphausia superba, E. pacifica and some species of Thysanoessa are often observed in the polar waters. The size and density of swarms of euphausiids are various. The average size of round swarms of Euphausia superba in the Antarcti...
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National Institute of Polar Research
1981
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ftdoajarticles:oai:doaj.org/article:28681bdbb56b4c27a53aec40080b13ab 2023-05-15T13:37:39+02:00 Swarm of euphausiids in the ocean Takahisa Nemoto Kimie Ishimaru Takako Shirai 1981-09-01T00:00:00Z https://doi.org/10.15094/00008263 https://doaj.org/article/28681bdbb56b4c27a53aec40080b13ab EN JA eng jpn National Institute of Polar Research http://doi.org/10.15094/00008263 https://doaj.org/toc/0085-7289 https://doaj.org/toc/2432-079X doi:10.15094/00008263 0085-7289 2432-079X https://doaj.org/article/28681bdbb56b4c27a53aec40080b13ab Antarctic Record, Iss 73, Pp 103-112 (1981) Geography (General) G1-922 article 1981 ftdoajarticles https://doi.org/10.15094/00008263 2022-12-31T00:27:14Z Euphausiids often form dense swarm in the sea. The surface swarms of Euphausia superba, E. pacifica and some species of Thysanoessa are often observed in the polar waters. The size and density of swarms of euphausiids are various. The average size of round swarms of Euphausia superba in the Antarctic is about 30 metres in diameter sometimes amounting to several hundreds. The species composition of those swarms is simple. It was mostly of Euphausia superba in the research in the 1972/73 season. Five mixed swarms of E. superba and Thysanoessa macrura are observed among 317 swarms studied in the high Antarctic. The biomass of swarm sometimes attains to 30kg/m^3,generally ranging between 100g/m^3 and 200g/m^3. Smaller individuals form heavier dense swarms in individual number, but the biomass per unit volume of sea water is less than the swarm of larger individuals. The relation between the size of zooplankton and micronekton and the density of individual number and biomass of swarms is also discussed. The Japanese common names for the English names of different types of aggregation of euphausiids are proposed to clarify the nature of swarms in the future description and studies. Article in Journal/Newspaper Antarc* Antarctic Euphausia superba Thysanoessa macrura Directory of Open Access Journals: DOAJ Articles Antarctic The Antarctic |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English Japanese |
topic |
Geography (General) G1-922 |
spellingShingle |
Geography (General) G1-922 Takahisa Nemoto Kimie Ishimaru Takako Shirai Swarm of euphausiids in the ocean |
topic_facet |
Geography (General) G1-922 |
description |
Euphausiids often form dense swarm in the sea. The surface swarms of Euphausia superba, E. pacifica and some species of Thysanoessa are often observed in the polar waters. The size and density of swarms of euphausiids are various. The average size of round swarms of Euphausia superba in the Antarctic is about 30 metres in diameter sometimes amounting to several hundreds. The species composition of those swarms is simple. It was mostly of Euphausia superba in the research in the 1972/73 season. Five mixed swarms of E. superba and Thysanoessa macrura are observed among 317 swarms studied in the high Antarctic. The biomass of swarm sometimes attains to 30kg/m^3,generally ranging between 100g/m^3 and 200g/m^3. Smaller individuals form heavier dense swarms in individual number, but the biomass per unit volume of sea water is less than the swarm of larger individuals. The relation between the size of zooplankton and micronekton and the density of individual number and biomass of swarms is also discussed. The Japanese common names for the English names of different types of aggregation of euphausiids are proposed to clarify the nature of swarms in the future description and studies. |
format |
Article in Journal/Newspaper |
author |
Takahisa Nemoto Kimie Ishimaru Takako Shirai |
author_facet |
Takahisa Nemoto Kimie Ishimaru Takako Shirai |
author_sort |
Takahisa Nemoto |
title |
Swarm of euphausiids in the ocean |
title_short |
Swarm of euphausiids in the ocean |
title_full |
Swarm of euphausiids in the ocean |
title_fullStr |
Swarm of euphausiids in the ocean |
title_full_unstemmed |
Swarm of euphausiids in the ocean |
title_sort |
swarm of euphausiids in the ocean |
publisher |
National Institute of Polar Research |
publishDate |
1981 |
url |
https://doi.org/10.15094/00008263 https://doaj.org/article/28681bdbb56b4c27a53aec40080b13ab |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Euphausia superba Thysanoessa macrura |
genre_facet |
Antarc* Antarctic Euphausia superba Thysanoessa macrura |
op_source |
Antarctic Record, Iss 73, Pp 103-112 (1981) |
op_relation |
http://doi.org/10.15094/00008263 https://doaj.org/toc/0085-7289 https://doaj.org/toc/2432-079X doi:10.15094/00008263 0085-7289 2432-079X https://doaj.org/article/28681bdbb56b4c27a53aec40080b13ab |
op_doi |
https://doi.org/10.15094/00008263 |
_version_ |
1766095550764023808 |