Long-term dynamics of biological indicators of navaga Eleginus nawaga (Walbaum, 1792) of the White Sea in relation to changes of the reservoir temperature regime
Systematic studies of navagа of the White Sea were initiated in the late 1960-ies. Data sets on dimensional indicators, age composition of populations of navaga of the Onega, Dvina, Mezen Bays and Voronka of the White Sea have been accumulated during 45 years of observations. The aim of this work is...
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Murmansk State Technical University
2017
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Online Access: | https://doi.org/10.21443/1560-9278-2017-20-2-370-380 https://doaj.org/article/8e7d724922584c1fb7bba45dd6187003 |
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ftdoajarticles:oai:doaj.org/article:8e7d724922584c1fb7bba45dd6187003 2023-05-15T16:02:55+02:00 Long-term dynamics of biological indicators of navaga Eleginus nawaga (Walbaum, 1792) of the White Sea in relation to changes of the reservoir temperature regime Stasenkov V. A. 2017-06-01T00:00:00Z https://doi.org/10.21443/1560-9278-2017-20-2-370-380 https://doaj.org/article/8e7d724922584c1fb7bba45dd6187003 RU rus Murmansk State Technical University http://vestnik.mstu.edu.ru/show.shtml?art=1879&pdf=1 https://doaj.org/toc/1560-9278 https://doaj.org/toc/1997-4736 doi:10.21443/1560-9278-2017-20-2-370-380 1560-9278 1997-4736 https://doaj.org/article/8e7d724922584c1fb7bba45dd6187003 Vestnik MGTU, Vol 20, Iss 2, Pp 370-380 (2017) White Sea length and weight of navaga global warming increase in rate of growth acceleration of maturation General Works A article 2017 ftdoajarticles https://doi.org/10.21443/1560-9278-2017-20-2-370-380 2022-12-31T00:52:09Z Systematic studies of navagа of the White Sea were initiated in the late 1960-ies. Data sets on dimensional indicators, age composition of populations of navaga of the Onega, Dvina, Mezen Bays and Voronka of the White Sea have been accumulated during 45 years of observations. The aim of this work is to identify the causes of the interannual and long-term changes of biological population parameters of navaga. As investigated interannual changes reflecting fish growth, the length and mass of 2 and 3 years old specimens have been chosen. It has been proved that interannual fluctuations in length and weight may depend on the length of the feeding season, as well as the number of populations. Climate warming has resulted that over the past 45 years since the beginning of observations the water temperature in the White Sea in April on average has increased by one degree, and some years – even more. Due to lengthening of the feeding period the seasonal growth of navaga has increased, respectively the annual rates of its length and weight have increased as well. The increase in the growth rate of navaga in the Onega and Dvina Bays has led to its mass mature and joining the fishing (commercial) herd at the age of two years. In the Mezen Bay and Voronka the trend on the increase in annual average length and weight navaga of only younger age groups has kept. Growth rate of large size navaga has decreased due to the almost complete cessation of fishing and the increase of older fish number. The revealed regularities in the change of the navaga population parameters of the White Sea should be used for preparing the forecast data on the state of its reserves. Article in Journal/Newspaper dvina Mezen Bay White Sea Directory of Open Access Journals: DOAJ Articles White Sea Onega ENVELOPE(38.100,38.100,63.900,63.900) Navaga ENVELOPE(162.106,162.106,59.229,59.229) Vestnik MGTU 20 2 370 380 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
Russian |
topic |
White Sea length and weight of navaga global warming increase in rate of growth acceleration of maturation General Works A |
spellingShingle |
White Sea length and weight of navaga global warming increase in rate of growth acceleration of maturation General Works A Stasenkov V. A. Long-term dynamics of biological indicators of navaga Eleginus nawaga (Walbaum, 1792) of the White Sea in relation to changes of the reservoir temperature regime |
topic_facet |
White Sea length and weight of navaga global warming increase in rate of growth acceleration of maturation General Works A |
description |
Systematic studies of navagа of the White Sea were initiated in the late 1960-ies. Data sets on dimensional indicators, age composition of populations of navaga of the Onega, Dvina, Mezen Bays and Voronka of the White Sea have been accumulated during 45 years of observations. The aim of this work is to identify the causes of the interannual and long-term changes of biological population parameters of navaga. As investigated interannual changes reflecting fish growth, the length and mass of 2 and 3 years old specimens have been chosen. It has been proved that interannual fluctuations in length and weight may depend on the length of the feeding season, as well as the number of populations. Climate warming has resulted that over the past 45 years since the beginning of observations the water temperature in the White Sea in April on average has increased by one degree, and some years – even more. Due to lengthening of the feeding period the seasonal growth of navaga has increased, respectively the annual rates of its length and weight have increased as well. The increase in the growth rate of navaga in the Onega and Dvina Bays has led to its mass mature and joining the fishing (commercial) herd at the age of two years. In the Mezen Bay and Voronka the trend on the increase in annual average length and weight navaga of only younger age groups has kept. Growth rate of large size navaga has decreased due to the almost complete cessation of fishing and the increase of older fish number. The revealed regularities in the change of the navaga population parameters of the White Sea should be used for preparing the forecast data on the state of its reserves. |
format |
Article in Journal/Newspaper |
author |
Stasenkov V. A. |
author_facet |
Stasenkov V. A. |
author_sort |
Stasenkov V. A. |
title |
Long-term dynamics of biological indicators of navaga Eleginus nawaga (Walbaum, 1792) of the White Sea in relation to changes of the reservoir temperature regime |
title_short |
Long-term dynamics of biological indicators of navaga Eleginus nawaga (Walbaum, 1792) of the White Sea in relation to changes of the reservoir temperature regime |
title_full |
Long-term dynamics of biological indicators of navaga Eleginus nawaga (Walbaum, 1792) of the White Sea in relation to changes of the reservoir temperature regime |
title_fullStr |
Long-term dynamics of biological indicators of navaga Eleginus nawaga (Walbaum, 1792) of the White Sea in relation to changes of the reservoir temperature regime |
title_full_unstemmed |
Long-term dynamics of biological indicators of navaga Eleginus nawaga (Walbaum, 1792) of the White Sea in relation to changes of the reservoir temperature regime |
title_sort |
long-term dynamics of biological indicators of navaga eleginus nawaga (walbaum, 1792) of the white sea in relation to changes of the reservoir temperature regime |
publisher |
Murmansk State Technical University |
publishDate |
2017 |
url |
https://doi.org/10.21443/1560-9278-2017-20-2-370-380 https://doaj.org/article/8e7d724922584c1fb7bba45dd6187003 |
long_lat |
ENVELOPE(38.100,38.100,63.900,63.900) ENVELOPE(162.106,162.106,59.229,59.229) |
geographic |
White Sea Onega Navaga |
geographic_facet |
White Sea Onega Navaga |
genre |
dvina Mezen Bay White Sea |
genre_facet |
dvina Mezen Bay White Sea |
op_source |
Vestnik MGTU, Vol 20, Iss 2, Pp 370-380 (2017) |
op_relation |
http://vestnik.mstu.edu.ru/show.shtml?art=1879&pdf=1 https://doaj.org/toc/1560-9278 https://doaj.org/toc/1997-4736 doi:10.21443/1560-9278-2017-20-2-370-380 1560-9278 1997-4736 https://doaj.org/article/8e7d724922584c1fb7bba45dd6187003 |
op_doi |
https://doi.org/10.21443/1560-9278-2017-20-2-370-380 |
container_title |
Vestnik MGTU |
container_volume |
20 |
container_issue |
2 |
container_start_page |
370 |
op_container_end_page |
380 |
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1766398592971440128 |