Особенности формирования нерестового стада восточнобалтийской трески в 1976-1989 гг.
The structure of the spawning stock in the Eastern Baltic cod is controlled by the year-class abundance, stock total size, biological status and fish maturation. The dynamics of the spawning stock age composition is shown for the years of different stock size. In general, the basis of the spawning stock is composed by the 3-to-5 year-old fishes, however, in the years 1981-1986 the dominance of older age groups (4-to-6 year old) was observed. Feeding conditions determine the growth and maturation of cod from different age groups and thereby there significance in the spawning stock. In the years of high stock abundance and poor food availability (1980-1983), a part of adult cod was immature and missed spawning. In the years of high stock size and unfavourable hydrological conditions in the Gotland spawning ground (1980-1982, 1987-1988), cod migrations to the spawning areas in the southern and western Baltic were observed. The population density is an important factor influencing the composition and size of then spawning stock, particularly in the years of unfavourable hydrological regime in the Gotland spawning ground.
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Format: | Journal Contribution biblioteca |
Language: | Russian |
Published: |
1991
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Subjects: | Baltic cod, Year-class abundance, Maturation, ASFA_2015::S::Spawning populations, ASFA_2015::A::Age composition, ASFA_2015::F::Fish stocks, ASFA_2015::E::Environmental conditions, |
Online Access: | http://hdl.handle.net/1834/10365 |
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dig-aquadocs-1834-103652021-05-19T06:57:44Z Особенности формирования нерестового стада восточнобалтийской трески в 1976-1989 гг. Spawning stock building in the Eastern Baltic cod in 1976-1989 Baranova, T.D. Baltic cod Year-class abundance Maturation ASFA_2015::S::Spawning populations ASFA_2015::A::Age composition ASFA_2015::F::Fish stocks ASFA_2015::E::Environmental conditions The structure of the spawning stock in the Eastern Baltic cod is controlled by the year-class abundance, stock total size, biological status and fish maturation. The dynamics of the spawning stock age composition is shown for the years of different stock size. In general, the basis of the spawning stock is composed by the 3-to-5 year-old fishes, however, in the years 1981-1986 the dominance of older age groups (4-to-6 year old) was observed. Feeding conditions determine the growth and maturation of cod from different age groups and thereby there significance in the spawning stock. In the years of high stock abundance and poor food availability (1980-1983), a part of adult cod was immature and missed spawning. In the years of high stock size and unfavourable hydrological conditions in the Gotland spawning ground (1980-1982, 1987-1988), cod migrations to the spawning areas in the southern and western Baltic were observed. The population density is an important factor influencing the composition and size of then spawning stock, particularly in the years of unfavourable hydrological regime in the Gotland spawning ground. Структура нерестового стада восточнобалтийской трески определяется влиянием таких факторов, как численность поколений, общая величина запаса, биологическое состояние и созревание рыб. Показана динамика возрастного состава нерестового стада трески в годы с различной величиной запаса. Основу нерестового стада обычно составляют трех-пятигодовики, но в период 1981-1986 гг. произошел сдвиг в сторону старших возрастных групп (четырех-шестигодовиков). Условия нагула определяют рост и созревание трески разных возрастных групп и, соотоветственно, их значение в нерестовом стаде. В годы высокого запаса (1980-1983) часть взрослой трески из-за плохой обеспеченности пищей не созрела и пропускала нерест. При большом запасе и неблагоприятных гидрологических условиях на Готландском нерестилище (1980-1982, 1987-1988 гг.) наблюдался уход части нерестовой трески на нерестилища в Южную и Западную Балтику. Важным фактором, влияющим на состав и величину нерестового стада, является плотность популяции, особенно в годы неблагоприятного гидрологического режима на Готландском нерестилище. Published 2017-11-02T12:36:13Z 2017-11-02T12:36:13Z 1991 Journal Contribution Not Known 0428-4984 http://hdl.handle.net/1834/10365 ru pp. 68-74 Baltic Sea |
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Baltic cod Year-class abundance Maturation ASFA_2015::S::Spawning populations ASFA_2015::A::Age composition ASFA_2015::F::Fish stocks ASFA_2015::E::Environmental conditions Baltic cod Year-class abundance Maturation ASFA_2015::S::Spawning populations ASFA_2015::A::Age composition ASFA_2015::F::Fish stocks ASFA_2015::E::Environmental conditions |
spellingShingle |
Baltic cod Year-class abundance Maturation ASFA_2015::S::Spawning populations ASFA_2015::A::Age composition ASFA_2015::F::Fish stocks ASFA_2015::E::Environmental conditions Baltic cod Year-class abundance Maturation ASFA_2015::S::Spawning populations ASFA_2015::A::Age composition ASFA_2015::F::Fish stocks ASFA_2015::E::Environmental conditions Baranova, T.D. Особенности формирования нерестового стада восточнобалтийской трески в 1976-1989 гг. |
description |
The structure of the spawning stock in the Eastern Baltic cod is controlled by the year-class abundance, stock total size, biological status and fish maturation. The dynamics of the spawning stock age composition is shown for the years of different stock size. In general, the basis of the spawning stock is composed by the 3-to-5 year-old fishes, however, in the years 1981-1986 the dominance of older age groups (4-to-6 year old) was observed. Feeding conditions determine the growth and maturation of cod from different age groups and thereby there significance in the spawning stock. In the years of high stock abundance and poor food availability (1980-1983), a part of adult cod was immature and missed spawning. In the years of high stock size and unfavourable hydrological conditions in the Gotland spawning ground (1980-1982, 1987-1988), cod migrations to the spawning areas in the southern and western Baltic were observed. The population density is an important factor influencing the composition and size of then spawning stock, particularly in the years of unfavourable hydrological regime in the Gotland spawning ground. |
format |
Journal Contribution |
topic_facet |
Baltic cod Year-class abundance Maturation ASFA_2015::S::Spawning populations ASFA_2015::A::Age composition ASFA_2015::F::Fish stocks ASFA_2015::E::Environmental conditions |
author |
Baranova, T.D. |
author_facet |
Baranova, T.D. |
author_sort |
Baranova, T.D. |
title |
Особенности формирования нерестового стада восточнобалтийской трески в 1976-1989 гг. |
title_short |
Особенности формирования нерестового стада восточнобалтийской трески в 1976-1989 гг. |
title_full |
Особенности формирования нерестового стада восточнобалтийской трески в 1976-1989 гг. |
title_fullStr |
Особенности формирования нерестового стада восточнобалтийской трески в 1976-1989 гг. |
title_full_unstemmed |
Особенности формирования нерестового стада восточнобалтийской трески в 1976-1989 гг. |
title_sort |
особенности формирования нерестового стада восточнобалтийской трески в 1976-1989 гг. |
publishDate |
1991 |
url |
http://hdl.handle.net/1834/10365 |
work_keys_str_mv |
AT baranovatd osobennostiformirovaniânerestovogostadavostočnobaltijskojtreskiv19761989gg AT baranovatd spawningstockbuildingintheeasternbalticcodin19761989 |
_version_ |
1756076804359061504 |