Biologic characteristics of Antarctic krill Euphausia superba Dana, 1850 (Euphausiacea: Euphausiidae) from the Powell Basin in 2020
https://doi.org/10.46845/1997-3071-2024-75-26-39
Abstract
The article is devoted to the study of the biology of Antarctic krill (Euphausia superba Dana, 1850), a mass commercial species in the Antarctic part of the Atlantic (APA). As a phytoplanktivore, krill is an important link in food chains and primary production distribution. E. superba is a highly valuable raw material for many industries and plays an important role in domestic fishing. In general, during the analysis of 805 krill individuals from the Powell Basin, the predominance of juvenile individuals in the samples was noted, and among heterosexual individuals – females. The total body length of krill was 13.6–50.2 mm (with the length of the carapace 3.1– 19.0 mm). The individual body weight of the individuals was 0.02–1.2 g. Males of E. superba of the Powell basin, on average, turned out to be larger than females, at the same time, but along the length of the carapace, the females reached large maximum sizes. For the first time for krill of this region, a significant advance in weight growth over linear growth was shown. Both males and females were dominated by small individuals (body length 29.3–36.4 mm) with very undeveloped or poorly developed gonads and copulatory organs, almost mature individuals were rare, their sizes were larger (45.3–46.5 mm). For the first time, the gonadosomatic index of precocious females was determined for the species, which amounted to 12–25%. For the first time, the average sizes of the most developed vitellogenic oocytes – 0.42 x 0.54 mm – were calculated for krill in the basin. The heterogeneity of maturation of female krill is probably related to the peculiarities of water circulation in the studied fishing area of the study and the transfer of juveniles here.
Keywords
antarctic krill,
Euphausia superba,
Powell basin,
length,
body weight,
size-weight dependence,
reproduction,
sizes of oocytes
Supporting agencies: The authors express their gratitude to the staff of the P. P. Shirshov Institute of Oceanology (Moscow) for providing E. superba material.
About the Authors
A. D. Kolesnikova
Kaliningrad State Technical University
Russian Federation
Russian Federation
Aleksandra D. Kolesnikova – Undergraduate student of the Department of Water Bioresources and Aquaculture
Kaliningrad
S. A. Sudnik
Kaliningrad State Technical University
Russian Federation
Russian Federation
Svetlana А. Sudnik – PhD in Biology, Associate Professor of the Department of Water Bioresources and Aquaculture
Kaliningrad
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Review
For citations:
Kolesnikova A.D., Sudnik S.A. Biologic characteristics of Antarctic krill Euphausia superba Dana, 1850 (Euphausiacea: Euphausiidae) from the Powell Basin in 2020. KSTU News. 2024;(75):26-39. (In Russ.) https://doi.org/10.46845/1997-3071-2024-75-26-39
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