Многолетняя динамика темпа роста сельди в Балтийском море в связи с изменением океанографических условий и обеспеченности пищей.
Long-term dynamics of temperature, oxygen content, concentration of nutrients (phosphates), zooplankton abundance and their influence on long-term changes of mean body mass, growth rate and herring distribution are considered according to the data of 1960—1979. Cyclic recurrence of changes of environmental factors, mean mass and body mass increase of fish of different ages was observed. The connections of herring growth rate with thermal, oxygen regimes and with food supply are shown. It was revealed that the increase of mean body mass of herring till it is 4 years old during the 1970ies in comparison with the 60ies was the consequence of zooplankton productivity increase and decrease in older age fish was hypothetically the consequence of decrease of cold-water nectobenthos. Cyclic recurrence of herring growth rate changes in different age groups is connected with the dynamics of environmental factors.
| Main Authors: | , , , , |
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| Format: | Journal Contribution biblioteca |
| Language: | Russian |
| Published: |
1982
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| Subjects: | Herring distribution, Herring growth rate, Oxygen regime, Thermal regime, ASFA_2015::E::Environmental factors, ASFA_2015::F::Food resources, ASFA_2015::L::Long-term changes, |
| Online Access: | http://hdl.handle.net/1834/15802 |
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| Summary: | Long-term dynamics of temperature, oxygen content, concentration of nutrients (phosphates), zooplankton abundance and their influence on long-term changes of mean body mass, growth rate and herring distribution are considered according to the data of 1960—1979. Cyclic recurrence of changes of environmental factors, mean mass and body mass increase of fish of different ages was observed. The connections of herring growth rate with thermal, oxygen regimes and with food supply are shown. It was revealed that the increase of mean body mass of herring till it is 4 years old during the 1970ies in comparison with the 60ies was the consequence of zooplankton productivity increase and decrease in older age fish was hypothetically the consequence of decrease of cold-water nectobenthos. Cyclic recurrence of herring growth rate changes in different age groups is connected with the dynamics of environmental factors. |
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