Occurrence of sterile North-East Arctic cod individual
Based on histological analysis, cod individuals of older age groups that completely lost their reproductive capacity due to age-related gonads' degeneration have been considered. Such individuals have been found among both females and males. It has been revealed that in the gonads of sterile fi...
Main Authors: | , |
---|---|
Format: | Other Non-Article Part of Journal/Newspaper |
Language: | Russian |
Published: |
2018
|
Subjects: | |
Online Access: | http://hdl.handle.net/1834/41502 |
id |
ftoceandocs:oai:aquadocs.org:1834/41502 |
---|---|
record_format |
openpolar |
spelling |
ftoceandocs:oai:aquadocs.org:1834/41502 2023-05-15T14:30:32+02:00 Occurrence of sterile North-East Arctic cod individual Встречаемость стерильных особей у северо-восточной арктической трески Filina, E. A. Makeenko, G. A. Russia Barents Sea Россия Баренцево море 2018-06-30 pp.303-308 http://hdl.handle.net/1834/41502 ru rus http://vestnik.mstu.edu.ru/show-eng.shtml?art=1953 http://vestnik.mstu.edu.ru/show.shtml?art=1953 http://hdl.handle.net/1834/41502 Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ Cod Oocytes Sterile gonads Maturity scale Треска Ооциты Стерильные гонады Шкала зрелости Ichthyology Ихтиология Journal Contribution 2018 ftoceandocs 2023-04-06T17:06:58Z Based on histological analysis, cod individuals of older age groups that completely lost their reproductive capacity due to age-related gonads' degeneration have been considered. Such individuals have been found among both females and males. It has been revealed that in the gonads of sterile fish the replacement of gametes with connective tissue is taking place. According to the obtained data, the portion of sterile fish in samples among females of more than 100 cm has reached 2.2 %. The analysed sterile individuals are characterized by the drastically low gonadosomatic index while gepatosomatic index is mostly above the average. The reasons of age related sterility of the Barents Sea cod have not been discovered yet. The main role of age related fish reproductive condition is considered to be linked to hormonal regulation distortion of sexual cycle. Studying the distortion in the cod reproduction resulting in spawning skips or fish sterility is believed to be significant not only in theory, but in practice as well. Mature females' biomass is usually applied as reproductive potential indicator. However, the reproductive disorder leading to spawning skips affects reproductive abilities of the species that should be taken into account while estimating total allowable catches. In order to monitor abundance of sterile individuals of the Barents Sea cod, it has been proposed to add its maturity scale with VII stage for fish without reproductive capacity. На основе гистологического анализа выявлены особи трески старших возрастных групп, полностью утратившие воспроизводительную способность в связи с возрастной дегенерацией гонад. Такие рыбы встречались как среди самок, так и среди самцов. Обнаружено, что у стерильных рыб в гонадах происходит замещение половых клеток соединительной тканью. По полученным данным среди самок длиной более 100 см доля стерильных рыб в пробах достигала 2,2 %. Исследованные стерильные особи трески характеризовались очень низким значением коэффициентов зрелости, в то время как показатели ... Other Non-Article Part of Journal/Newspaper Arctic cod Arctic Barents Sea IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications Arctic Barents Sea |
institution |
Open Polar |
collection |
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications |
op_collection_id |
ftoceandocs |
language |
Russian |
topic |
Cod Oocytes Sterile gonads Maturity scale Треска Ооциты Стерильные гонады Шкала зрелости Ichthyology Ихтиология |
spellingShingle |
Cod Oocytes Sterile gonads Maturity scale Треска Ооциты Стерильные гонады Шкала зрелости Ichthyology Ихтиология Filina, E. A. Makeenko, G. A. Occurrence of sterile North-East Arctic cod individual |
topic_facet |
Cod Oocytes Sterile gonads Maturity scale Треска Ооциты Стерильные гонады Шкала зрелости Ichthyology Ихтиология |
description |
Based on histological analysis, cod individuals of older age groups that completely lost their reproductive capacity due to age-related gonads' degeneration have been considered. Such individuals have been found among both females and males. It has been revealed that in the gonads of sterile fish the replacement of gametes with connective tissue is taking place. According to the obtained data, the portion of sterile fish in samples among females of more than 100 cm has reached 2.2 %. The analysed sterile individuals are characterized by the drastically low gonadosomatic index while gepatosomatic index is mostly above the average. The reasons of age related sterility of the Barents Sea cod have not been discovered yet. The main role of age related fish reproductive condition is considered to be linked to hormonal regulation distortion of sexual cycle. Studying the distortion in the cod reproduction resulting in spawning skips or fish sterility is believed to be significant not only in theory, but in practice as well. Mature females' biomass is usually applied as reproductive potential indicator. However, the reproductive disorder leading to spawning skips affects reproductive abilities of the species that should be taken into account while estimating total allowable catches. In order to monitor abundance of sterile individuals of the Barents Sea cod, it has been proposed to add its maturity scale with VII stage for fish without reproductive capacity. На основе гистологического анализа выявлены особи трески старших возрастных групп, полностью утратившие воспроизводительную способность в связи с возрастной дегенерацией гонад. Такие рыбы встречались как среди самок, так и среди самцов. Обнаружено, что у стерильных рыб в гонадах происходит замещение половых клеток соединительной тканью. По полученным данным среди самок длиной более 100 см доля стерильных рыб в пробах достигала 2,2 %. Исследованные стерильные особи трески характеризовались очень низким значением коэффициентов зрелости, в то время как показатели ... |
format |
Other Non-Article Part of Journal/Newspaper |
author |
Filina, E. A. Makeenko, G. A. |
author_facet |
Filina, E. A. Makeenko, G. A. |
author_sort |
Filina, E. A. |
title |
Occurrence of sterile North-East Arctic cod individual |
title_short |
Occurrence of sterile North-East Arctic cod individual |
title_full |
Occurrence of sterile North-East Arctic cod individual |
title_fullStr |
Occurrence of sterile North-East Arctic cod individual |
title_full_unstemmed |
Occurrence of sterile North-East Arctic cod individual |
title_sort |
occurrence of sterile north-east arctic cod individual |
publishDate |
2018 |
url |
http://hdl.handle.net/1834/41502 |
op_coverage |
Russia Barents Sea Россия Баренцево море |
geographic |
Arctic Barents Sea |
geographic_facet |
Arctic Barents Sea |
genre |
Arctic cod Arctic Barents Sea |
genre_facet |
Arctic cod Arctic Barents Sea |
op_relation |
http://vestnik.mstu.edu.ru/show-eng.shtml?art=1953 http://vestnik.mstu.edu.ru/show.shtml?art=1953 http://hdl.handle.net/1834/41502 |
op_rights |
Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ |
_version_ |
1766304361954148352 |