Variations in the activity of the thyroid gland of the cod, Gadus callarias L., in relation to its migrations in the Barents Sea II. The ‘dummy of run’ of the immature fish

1959 ◽  
Vol 38 (2) ◽  
pp. 417-422 ◽  
Author(s):  
A. D. Woodhead
Keyword(s):  
Thyroid Gland ◽  
Barents Sea ◽  
Spawning Ground ◽  
Sea Trout ◽  
The Barents Sea ◽  
Thyroid Glands ◽  
Seasonal Migrations ◽  
Relationship Of ◽  
The Relationship ◽  
Immature Fish

Describing the migrations and movements of the cod, Gadus callarias L., in the Barents Sea, Trout (1957) suggested that the immature fish carry out a false spawning migration. ‘The pattern of migration of the immatures is basically similar to that of the matures…with increasing age, the immatures’ southerly winter migration approached in length that of the mature cod, as if, in the years immediately prior to maturity they were making a “dummy run” towards the spawning ground.' The seasonal migrations of both the adult and immature cod have been related to changes in the activity of the thyroid gland in this fish (Woodhead, 1959). During the spring of 1956 and 1957, collections of thyroid glands from immature cod were made at stations from Bear Island to the Norwegian coast. It was hoped that a study of these glands might demonstrate further the relationship of the activity of the thyroid gland to the migration of the fish.

scholarly journals On unique stone beaches on the Arctic coast of the Kola Peninsula

Vestnik MGTU ◽  
2021 ◽  
Vol 24 (1) ◽  
pp. 46-56
Author(s):  
Y. N. Neradovsky ◽  
Y. A. Miroshnikova ◽  
A. A. Kompanchenko ◽  
A. V. Chernyavsky
Keyword(s):  
Barents Sea ◽  
Golden Section ◽  
Stable State ◽  
The Arctic ◽  
Solid Core ◽  
Clastic Material ◽  
The Barents Sea ◽  
Beach Sediments ◽  
Arctic Coast ◽  
The Relationship

The results of studies of 11 stone beaches on the coast of the Barents Sea in the area of the Teriberskaya Bay have been presented. The studies were carried out from 2017 to 2019. As a result of the work, the structure of the beaches, their size, the composition of clastic material and the relationship with bedrocks were studied in detail. The genetic link between beaches and sea terraces has been established. Special attention has been paid to the morphology of beach clastic material, the conditions of its formation, and its role in abrasion activity. It has been shown that the clastic material of the beaches mainly corresponds to boulders equal to 100-1,000 mm, to a lesser extent to pebbles 10-100 mm, and rarely - gravel 1-10 mm. Individual boulders reach 2,000 mm. Sandy fractions in the composition of beach sediments are practically absent. The roundness of the fragments is high, semi-circular and rounded grains predominate, the most perfect shape of the rounded fragments is a biaxial ellipsoid or egg. Perfectly rounded boulders and pebbles in some areas account for up to 30 % of beach deposits. Measurements of the parameters of the egg-shaped pebbles have shown that they are close to the parameters of the "golden section" of the egg, i. e. meet the most durable form, resistant to destruction. Thus, the process of abrasion of the beach debris is directed towards their acquisition of the most energetically stable state. This suggests that the original shape of the debris contained a solid core in the form of a biaxial ellipsoid.

scholarly journals Interrelationships Between the Thyroid Gland and Adrenal Cortex During Fear, Cold and Restraint in the sheep

1976 ◽  
Vol 29 (2) ◽  
pp. 117
Author(s):  
Ian R Falconer
Keyword(s):  
Thyroid Gland ◽  
Adrenal Cortex ◽  
Plasma Cortisol ◽  
Physical Restraint ◽  
Cortisol Concentration ◽  
Reciprocal Relationship ◽  
Plasma Cortisol Concentration ◽  
Thyroid Glands ◽  
Parallel Activation ◽  
The Relationship

To examine the relationship between the functioning of the adrenal and thyroid glands in sheep, plasma cortisol concentration, concentration of protein-bound 1251 from thyroid vein plasma, heart rate and blood pressure were measured in ewes bearing exteriorized thyroid glands. During these measurements stresses were imposed on the animals: fear induced by pistol shots or by a barking dog, cold by cooling and wetting, and physical restraint by a loose harness. Increases in plasma cortisol concentration of 2-6 jlg/lOO ml were observed with each type of stressor, the response rapidly decreasing with habituation of the animal. Increases in the concentration of protein-bound 1251 from thyroid vein plasma were also observed repeatedly during cooling and wetting, occasionally after the introduction of a barking dog, and during continued restraint. Cooling and wetting was the only stress causing consistent parallel activation of the adrenal cortex and thyroid gland; the other stressors resulted in independent fluctuations of secretions, as indicated by plasma cortisol concentration and concentration of protein-bound 1251 from thyroid vein plasma. No reciprocal relationship between thyroid gland and adrenal cortex activity was detected.

scholarly journals Changes in the relationship between sea temperature and recruitment of cod, haddock and herring in the Barents Sea

2013 ◽  
Vol 9 (9) ◽  
pp. 895-907 ◽  
Author(s):  
Bjarte Bogstad ◽  
Gjert Endre Dingsør ◽  
Randi B. Ingvaldsen ◽  
Harald Gjøsæter
Keyword(s):  
Barents Sea ◽  
Sea Temperature ◽  
The Barents Sea ◽  
The Relationship

The Relationship of the Juvenile Herring Stocks in Barkley Sound to the Major Adult Herring Populations in British Columbia

1959 ◽  
Vol 16 (3) ◽  
pp. 309-320 ◽  
Author(s):  
Alan S. Hourston
Keyword(s):  
Population Studies ◽  
Adult Population ◽  
Small Body ◽  
Body Cavity ◽  
Basic Unit ◽  
Barkley Sound ◽  
Adult Schools ◽  
Relationship Of ◽  
The Relationship ◽  
Immature Fish

During the summers of 1951–53, small body-cavity tags were inserted in 55,547 juvenile (1-year) herring on the lower west coast of Vancouver Island. Fifty of these tags were recoved from the catches of adult fish between 1953–54 and 1956–57. These recoveries indicated homing by sub-district (the region occupied by an adult population) to be 52% after two years at large, and 64% after three years. Comparable data for herring tagged as adults showed 82% and 81% homing respectively. The greater tendency for the immature fish to mix with other adult populations may result from the fact that these fish join adult schools when the latter are considerably dispersed and intermixed on the offshore feeding grounds. Thus, population studies linking the juvenile and adult stages may require the use of a larger basic unit of area than that encompassing the distribution of the adult population. The dimensions of this unit will depend on the local potential for intermixing of adult populations at the time of recruitment.

Petrography of bottom rock material

2021 ◽  
pp. 492-530
Author(s):  
G.S. Kharin ◽  
◽  
D.V. Eroshenko ◽  
A.V. Bulokhov ◽  
S.M. Isachenko ◽  
...  
Keyword(s):  
Barents Sea ◽  
Distribution Patterns ◽  
Geological Mapping ◽  
Rock Material ◽  
Quaternary Sediments ◽  
Petrographic Composition ◽  
The Barents Sea ◽  
Mineral Compositions ◽  
The Relationship ◽  
Bottom Rock

The Quaternary sediments of the Barents Sea contain a large amount of coarse clastic bottom rock material (BRM), with varying degrees of grain roundedness. Its study is important in determining the type and composition of the earth's crust, with paleogeographic constructions and revealing data on the dynamics of the ice cover. Studies of the Barents Sea BRM began in the 20s of the last century. During this period, were formed basically two hypotheses about the relationship between the distribution of BRM with elements of the sea topography and bedrock exposure. One of them considers BRM a marker suitable for identifying petrographic provinces at the bottom of the Barents Sea [Klenova, 1960]. In this chapter, on the basis of new up-to-date data obtained in 67 and 68 cruises of the RV Akademik Mstislav Keldysh in 2016–2017, the grain size, petrochemical and mineral compositions of BRM are estimated, their distribution patterns are given, transportation methods are analyzed and its feasibility is evaluated use in geological mapping. 4,193 samples were processed in Quaternary sediments, among which 86 reference types were identified. It was shown that the diversity of the composition of the Barents Sea BRM depends on glacial and ice-ice spacing. Therefore, the use of BRM for geological mapping of the bottom of the Barents Sea is unsuitable. The petrographic composition of the BRM in different regions of the Barents Sea is subject to significant fluctuations, but in general it is complementary to the set of rocks in the areas of demolition of adjacent land and depends on the extent of exaration and the removal of exaration material by the glacier to sedimentation areas.

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