INVESTIGATIONS OF MOULT CYCLES OF THE ANTARCTIC KRILL EUPHAUSIA SUPERBA DANA IN CONCENTRATIONS IN THE D'URVILLE SEA (EAST ANTARCTIC) (Twelfth Symposium on Polar Biology)
The krill (Euphausia superbd) collected with the commercial trawl in the D'Urville Sea (off the Terre d'Adelie) in late January-early April 1989 was investigated for the moult stages, sex, length and maturity stages. From each catch, 41-80 (58 on the average) specimens were examined for mo...
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ftnipr:oai:nipr.repo.nii.ac.jp:00005119 2023-05-15T13:49:03+02:00 INVESTIGATIONS OF MOULT CYCLES OF THE ANTARCTIC KRILL EUPHAUSIA SUPERBA DANA IN CONCENTRATIONS IN THE D'URVILLE SEA (EAST ANTARCTIC) (Twelfth Symposium on Polar Biology) Vasily A. SPIRIDONOV 1991-03 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=5119 http://id.nii.ac.jp/1291/00005119/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=5119&item_no=1&attribute_id=18&file_no=1 en eng Proceeding Ail-Union Research Institute of Sea Fisheries and Oceanography (VNIRO):(Present address)Zoological Museum of the Moscow State University National Institute of Polar Research https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=5119 http://id.nii.ac.jp/1291/00005119/ AA10819561 Proceedings of the NIPR Symposium on Polar Biology, 4, 17-29(1991-03) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=5119&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1991 ftnipr 2023-02-11T20:10:44Z The krill (Euphausia superbd) collected with the commercial trawl in the D'Urville Sea (off the Terre d'Adelie) in late January-early April 1989 was investigated for the moult stages, sex, length and maturity stages. From each catch, 41-80 (58 on the average) specimens were examined for moult stages according to BUHHOLZ'S method with the identification of DRACH'S moult stages. Euphausia superba aggregating in concentrations appeared to be characterized by the specific phases of the moult cycle. Most of the animals were intermoult or early premoult stages regardless of the sex and age. The premoult krill may leave the aggregations before ecdysis (probably as swarms with synchronous moulting). Thus, the moult processes should strongly influence the size and density of the concentrations. In autumn the moult frequency decreased, so the krill in concentrations was mostly in the intermoult phases. A slow moult rate is connected with an increase of the aggregation density probably due to the decreased loss of the moulting krill or (and) moderation of the locomotor activity correlated with the moult state. Report Antarc* Antarctic Antarctic Krill D'Urville Sea Euphausia superba Polar Biology Proceedings of the NIPR Symposium on Polar Biology National Institute of Polar Research Repository, Japan Antarctic D'Urville Sea ENVELOPE(140.000,140.000,-65.000,-65.000) The Antarctic |
institution |
Open Polar |
collection |
National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
description |
The krill (Euphausia superbd) collected with the commercial trawl in the D'Urville Sea (off the Terre d'Adelie) in late January-early April 1989 was investigated for the moult stages, sex, length and maturity stages. From each catch, 41-80 (58 on the average) specimens were examined for moult stages according to BUHHOLZ'S method with the identification of DRACH'S moult stages. Euphausia superba aggregating in concentrations appeared to be characterized by the specific phases of the moult cycle. Most of the animals were intermoult or early premoult stages regardless of the sex and age. The premoult krill may leave the aggregations before ecdysis (probably as swarms with synchronous moulting). Thus, the moult processes should strongly influence the size and density of the concentrations. In autumn the moult frequency decreased, so the krill in concentrations was mostly in the intermoult phases. A slow moult rate is connected with an increase of the aggregation density probably due to the decreased loss of the moulting krill or (and) moderation of the locomotor activity correlated with the moult state. |
format |
Report |
author |
Vasily A. SPIRIDONOV |
spellingShingle |
Vasily A. SPIRIDONOV INVESTIGATIONS OF MOULT CYCLES OF THE ANTARCTIC KRILL EUPHAUSIA SUPERBA DANA IN CONCENTRATIONS IN THE D'URVILLE SEA (EAST ANTARCTIC) (Twelfth Symposium on Polar Biology) |
author_facet |
Vasily A. SPIRIDONOV |
author_sort |
Vasily A. SPIRIDONOV |
title |
INVESTIGATIONS OF MOULT CYCLES OF THE ANTARCTIC KRILL EUPHAUSIA SUPERBA DANA IN CONCENTRATIONS IN THE D'URVILLE SEA (EAST ANTARCTIC) (Twelfth Symposium on Polar Biology) |
title_short |
INVESTIGATIONS OF MOULT CYCLES OF THE ANTARCTIC KRILL EUPHAUSIA SUPERBA DANA IN CONCENTRATIONS IN THE D'URVILLE SEA (EAST ANTARCTIC) (Twelfth Symposium on Polar Biology) |
title_full |
INVESTIGATIONS OF MOULT CYCLES OF THE ANTARCTIC KRILL EUPHAUSIA SUPERBA DANA IN CONCENTRATIONS IN THE D'URVILLE SEA (EAST ANTARCTIC) (Twelfth Symposium on Polar Biology) |
title_fullStr |
INVESTIGATIONS OF MOULT CYCLES OF THE ANTARCTIC KRILL EUPHAUSIA SUPERBA DANA IN CONCENTRATIONS IN THE D'URVILLE SEA (EAST ANTARCTIC) (Twelfth Symposium on Polar Biology) |
title_full_unstemmed |
INVESTIGATIONS OF MOULT CYCLES OF THE ANTARCTIC KRILL EUPHAUSIA SUPERBA DANA IN CONCENTRATIONS IN THE D'URVILLE SEA (EAST ANTARCTIC) (Twelfth Symposium on Polar Biology) |
title_sort |
investigations of moult cycles of the antarctic krill euphausia superba dana in concentrations in the d'urville sea (east antarctic) (twelfth symposium on polar biology) |
publisher |
Proceeding |
publishDate |
1991 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=5119 http://id.nii.ac.jp/1291/00005119/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=5119&item_no=1&attribute_id=18&file_no=1 |
long_lat |
ENVELOPE(140.000,140.000,-65.000,-65.000) |
geographic |
Antarctic D'Urville Sea The Antarctic |
geographic_facet |
Antarctic D'Urville Sea The Antarctic |
genre |
Antarc* Antarctic Antarctic Krill D'Urville Sea Euphausia superba Polar Biology Proceedings of the NIPR Symposium on Polar Biology |
genre_facet |
Antarc* Antarctic Antarctic Krill D'Urville Sea Euphausia superba Polar Biology Proceedings of the NIPR Symposium on Polar Biology |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=5119 http://id.nii.ac.jp/1291/00005119/ AA10819561 Proceedings of the NIPR Symposium on Polar Biology, 4, 17-29(1991-03) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=5119&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766250663772160000 |