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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Main Authors: Takahisa Nemoto, Kimie Ishimaru, Takako Shirai
Format: Article in Journal/Newspaper
Language:English
Japanese
Published: National Institute of Polar Research 1981
Subjects:
Online Access:https://doi.org/10.15094/00008263
https://doaj.org/article/28681bdbb56b4c27a53aec40080b13ab
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spelling 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
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