scholarly journals Juveniles of pink and chum salmon in fall season (September-October 2013) in the western Bering Sea. Distribution, feeding, and strategy of growth

2015 ◽  
Vol 181 (2) ◽  
pp. 49-56
Author(s):  
Artem Е. Lazhentsev ◽  
Olga А. Maznikova
Keyword(s):  
Growth Rate ◽  
Body Size ◽  
Chemical Composition ◽  
Bering Sea ◽  
Coastal Waters ◽  
Chum Salmon ◽  
Linear Growth ◽  
Protein Food ◽  
Fall Season ◽  
Western Bering Sea

Ontogeny of one generation of pink and chum salmons is described for the period after the juveniles redistribution from coastal waters to deep-water areas in the western Bering Sea in September-October, 2013. They fed intensively; their diet included hyperiids, pteropods and young euphausiids, i.e. the protein food with low lipid content and low caloricity. They spend only 20 % of their consumption for growth because of decreasing of the growth rate with body size increasing and significant energy expenditure for moving activity. Chemical composition of the juveniles tissues was almost the same for both species, the muscle tissue was distinguished by low fat content, without interspecies differences. So, fat accumulation doesn’t occur at this stage of ontogeny, the whole energy obtained from food is spent for moving, linear growth and metabolism.

Dynamics of body size, age, and annual growth rate of Anadyr chum salmon Oncorhynchus keta in 1962–2010

2012 ◽  
Vol 52 (3) ◽  
pp. 207-225 ◽  
Author(s):  
A. V. Zavolokin ◽  
V. V. Kulik ◽  
I. I. Glebov ◽  
E. N. Dubovets ◽  
Yu. N. Khokhlov
Keyword(s):  
Growth Rate ◽  
Body Size ◽  
Chum Salmon ◽  
Annual Growth ◽  
Oncorhynchus Keta ◽  
Annual Growth Rate ◽  
Chum Salmon Oncorhynchus Keta

scholarly journals TENDENCIES OF CLIMATE CHANGES FOR THERMAL CONDITIONS IN THE COASTAL WATERS OF THE WESTERN BERING SEA AND ADJACENT AREAS IN THE LAST DECADES

2018 ◽  
Vol 193 ◽  
pp. 167-182 ◽  
Author(s):  
I. D. Rostov ◽  
E. V. Dmitrieva ◽  
A. A. Vorontsov
Keyword(s):  
Air Temperature ◽  
Bering Sea ◽  
Coastal Waters ◽  
Empirical Orthogonal Functions ◽  
Climate Indices ◽  
Data Series ◽  
Orthogonal Functions ◽  
Climatic Trend ◽  
Climatic Trends ◽  
Western Bering Sea

The sea surface temperature (SST) variability in recent conditions of climate warming is analyzed for the coastal waters in the western Bering Sea and adjacent areas on the data of regular observations on coastal hydrometeorological stations in 1980–2016 and the data of NOAA_OI_SST_V2 reanalysis, taking into account the climate indices variations. The data series are analyzed using the methods of Empirical Orthogonal Functions, cluster analysis, and correlation analysis. Mean climatic trends are estimated for the air temperature as +0.27 о C/decade and for SST as +0.23 о C/decade; they explain 27 % and 35 % of the year-to-year variability, respectively. The warming patterns are not identical for all seasons and areas. The most rapid growth of the air temperature and SST is observed for warm season (on average +0.36 o C/decade and +0.49 o C/decade). Both year-to-year fluctuations of SST and its climatic trend increase from south to north, the SST trend has increased from 0.11 to 0.32 o C/decade. Statistically significant climatic trends are found also in the changes of zonal and meridional components of wind velocity and certain indices of atmosphere circulation.

scholarly journals Role of arrowworm Sagitta elegans (Chaetognatha) in plankton communities of the western Bering Sea

2021 ◽  
Vol 201 (2) ◽  
pp. 425-439
Author(s):  
E. P. Dulepova
Keyword(s):  
Growth Rate ◽  
Deep Water ◽  
Bering Sea ◽  
High Growth ◽  
High Growth Rate ◽  
Rapid Response ◽  
Total Production ◽  
Western Bering Sea ◽  
Zooplankton Communities

Arrowworm Saggita elegans is one of the important and abundant species in zooplankton communities of the western Bering Sea. Interannual variability of their biomass is considered on the data of long-term surveys conducted in 1986–2018, the species production is determined for the Anadyr-Navarin region and deep-water basin in 2008–2018, and the total production of zooplankton communities is calculated for 2008, 2015, and 2018. In the modern period, the biomass of S. elegans has significantly decreased compared to 1990–2000s, with exception of the shallow areas where it is relatively stable. The last decade included two periods with different oceanographic regime: the cold years (2007–2013) and the warm ones (2014–2018), but S. elegans did not demonstrate rapid response to such change of abiotic factors. However, the water circulation patterns in the upper layer were important for them and determined their transport and accumulation. For example, the high abundance and production of arrowworms in the deep-water area in 2008 and in the Anadyr-Navarin region in 2011 were conditioned by their transport and accumulation in these areas. S. elegans are predators, preying mainly upon copepods, so their impact on structure and production of zooplankton community is determined by significant grazing estimated at 50–100 % of Copepoda production or even more. The total production of zooplankton communities was higher in «warm» 2015 and 2018 than in «cold» 2008. The arrowworm production decreased in these warm years but production of non-predatory species (basically small- and medium-sized copepods) increased sharply because of their rapid response to temperature changes realized in high growth rate under higher temperature. Thus, the role of S. elegans in formation of the community production becomes lower in conditions favorable for high growth rate of non-predatory species.

scholarly journals SIZE COMPOSITION AND GROWTH RATES OF BLUE KING CRAB PARALITHODES PLATYPUS BRANDT, 1850 IN THE RUSSIAN SECTOR OF THE BERING SEA

2019 ◽  
Vol 196 ◽  
pp. 81-89
Author(s):  
P. A. Fedotov ◽  
I. S. Chernienko
Keyword(s):  
Growth Rate ◽  
Bering Sea ◽  
Size Structure ◽  
Stable State ◽  
Size Composition ◽  
King Crab ◽  
Western Bering Sea ◽  
Blue King Crab ◽  
Paralithodes Platypus ◽  
Cyclic Changes

Size composition and growth rate of blue king crab males are analyzed on the data of 8 bottom trawl surveys conducted in the western Bering Sea in summer-fall seasons within the period from 2005 to 2017. Significant changes in size structure of this population are revealed. Portion of commercial males was the lowest (18.7 %) in 2010 because of the strong yearclass appeared in the catches in 2005, when its males carapace had the width 20–40 mm, that provided in 2008–2010 the percentage of juveniles with the size < 100 mm about 59–60 %. Then this strong year-class reached the commercial size, so the portion of commercial males increased to 66 % in 2014 and to 85 % in 2015–2016. The portion of juveniles was extremely small (3.1–6.5 %) in these years. The portion of commercial males had reduced again to 67 % in 2017 because of a new strong year-class appearance that provided the juveniles percentage increasing to 24.6 %. The mean size of commercial males has increased since 2012 in 18 mm and reached the value of 160.4 mm in 2017. Age of the crab males entry into the commercial cohort is estimated as 8 years. The observed cyclic changes in size composition of blue king crab and estimated value of its growth rate indicate indirectly a good and stable state of its population in the western Bering Sea.

Sign in / Sign up

Export Citation Format

Share Document