LONGEVITY OF THE ANTARCTIC KRILL (EUPHAUSIA SUPERBA DANA) BASED ON A LABORATORY EXPERIMENT (Ninth Symposium on Polar Biology)

Laboratory observations over a 6-year period were made on the intermoult period (IP), changes in body length (BL) and maturity of 3 female and 3 male krill brought from Antarctic water to Australia. While the IP was stable over the period (range of individual means; 25.6-29.6 days), both BL and matu...

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Bibliographic Details
Main Authors: イケダ ツトム /, Tsutomu IKEDA, P. G. THOMAS
Format: Report
Language:English
Published: Proceeding 1987
Subjects:
Antarctic
The Antarctic
Antarc*
Antarctic Krill
Euphausia superba
Polar Biology
Proceedings of the NIPR Symposium on Polar Biology
Online Access:https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=5015
http://id.nii.ac.jp/1291/00005015/
https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=5015&item_no=1&attribute_id=18&file_no=1
Description
Summary:Laboratory observations over a 6-year period were made on the intermoult period (IP), changes in body length (BL) and maturity of 3 female and 3 male krill brought from Antarctic water to Australia. While the IP was stable over the period (range of individual means; 25.6-29.6 days), both BL and maturity changed greatly from one specimen to the next. Reversible modes shown in BL and maturity suggest that neither parameter is a good indicator of chronological age in this animal. Considering the age of krill at the beginning of this experiment (least 1-2 year old) krill lived for 7-8 years, which is considerably longer than the previously hypothesized 2-5 year life span of this animal.

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