A Nonlethal, Rapid Method for Assessing the Somatic Energy Content of Migrating Adult Pacific Salmon

2005 ◽  
Vol 134 (1) ◽  
pp. 184-191 ◽  
Author(s):  
Glenn T. Crossin ◽  
Scott G. Hinch
Keyword(s):  
Rapid Method ◽  
Pacific Salmon ◽  
Energy Content ◽  
Somatic Energy

Freshwater Migration as a Determinant Factor in the Somatic Cost of Reproduction of Two Anadromous Coregonines of James Bay

1990 ◽  
Vol 47 (2) ◽  
pp. 318-334 ◽  
Author(s):  
Yvan Lambert ◽  
Julian J. Dodson
Keyword(s):  
Energy Cost ◽  
Reproductive Effort ◽  
Energy Content ◽  
Cost Of Reproduction ◽  
Energy Gain ◽  
Lake Whitefish ◽  
James Bay ◽  
Energy Increase ◽  
Species Specific ◽  
Somatic Energy

We tested the hypothesis that the species-specific costs of migration differentially affect reproductive effort and somatic cost of reproduction in sympatric anadromous populations of cisco (Coregonus artedii) and lake whitefish (C. clupeaformis) of James Bay. Reproductive effort, which includes the energy cost of migration, is higher for cisco. Female cisco allocate more energy to reproduction than its total energy gain. The energy invested by lake whitefish in reproduction is approximately equal to its seasonal energy gain. Reproduction results in large differences in the energy content of gonads, viscera, and carcass between reproductive and nonreproductive fish of the same length. Neither cisco nor lake whitefish are able to spawn two years in succession. The somatic energy increase of reproductive female cisco is 121% lower than the somatic energy increase of nonreproductive females; similar comparisons are 89% (female) and 103% (male) for lake whitefish. The energy cost of migration is largely responsible for the higher somatic cost of reproduction observed for cisco. These different somatic costs of migration are related to resource accumulation prior to migration and to differences in the aerobic cost of swimming between the two species in combination with the difficulty of the freshwater migration.

scholarly journals Somatic energy content and histological analysis of the gonads in Antarctic fish from the Scotia Arc

2005 ◽  
Vol 69 (S2) ◽  
pp. 305-316 ◽  
Author(s):  
Fabián Alberto Vanella ◽  
Jorge Calvo ◽  
Elba Rosa Morriconi ◽  
Daniel Ramón Aureliano
Keyword(s):  
Histological Analysis ◽  
Energy Content ◽  
Antarctic Fish ◽  
Scotia Arc ◽  
Somatic Energy

scholarly journals Energy content of Pacific salmon as prey of northern and southern resident killer whales

2014 ◽  
Vol 25 (3) ◽  
pp. 265-281 ◽  
Author(s):  
SM O’Neill ◽  
GM Ylitalo ◽  
JE West
Keyword(s):  
Pacific Salmon ◽  
Energy Content ◽  
Killer Whales

The role of environmental conditions in the seasonal synthesis and utilisation of biochemical energy reserves in the giant scallop, Placopecten magellanicus

1990 ◽  
Vol 68 (4) ◽  
pp. 750-756 ◽  
Author(s):  
R. J. Thompson ◽  
B. A. MacDonald
Keyword(s):  
Shallow Water ◽  
Spring Bloom ◽  
Energy Content ◽  
Somatic Tissue ◽  
Unit Weight ◽  
Energy Reserves ◽  
Lipid Levels ◽  
Placopecten Magellanicus ◽  
Somatic Energy

Throughout most of the year, carbohydrate and lipid levels in the somatic tissue of scallops from 31 m depth at Sunnyside, Trinity Bay, Newfoundland, were lower than corresponding levels in scallops from 10 m depth at the same location, resulting in a higher energy content per unit weight in the latter group. In the gonad, however, there was no difference between the groups in the concentrations of carbohydrate and lipid. The absolute quantities of these biochemical constituents in both gonad and somatic tissue were greater in scallops from shallow water, owing to their higher body weight. Thus, in the poorer conditions associated with deeper water at this site, scallops maintained carbohydrate and lipid pools in the gonad but did not accumulate somatic energy reserves to the same extent as did scallops from shallow water where conditions were more favourable. Individuals from 31 m were therefore less well buffered against environmental stress than those from 10 m. Biochemical energy reserves were deposited during and after the spring bloom, but not in the period after spawning. The loss of somatic carbohydrate during overwintering was greater in scallops from 31 m, and only in this group was there any utilisation of carbohydrate and lipid in winter.

Texture measurements in Al2O3 using BEKP

1994 ◽  
Vol 52 ◽  
pp. 608-609
Author(s):  
M. D. Vaudin ◽  
J. P. Cline
Keyword(s):  
Neutron Diffraction ◽  
Rapid Method ◽  
Crystallographic Orientation ◽  
Specimen Surface ◽  
X Ray Diffraction ◽  
Anisotropic Crystal ◽  
X Ray ◽  
Verification Method ◽  
Crystal Properties ◽  
Backscattered Electron

The study of preferred crystallographic orientation (texture) in ceramics is assuming greater importance as their anisotropic crystal properties are being used to advantage in an increasing number of applications. The quantification of texture by a reliable and rapid method is required. Analysis of backscattered electron Kikuchi patterns (BEKPs) can be used to provide the crystallographic orientation of as many grains as time and resources allow. The technique is relatively slow, particularly for noncubic materials, but the data are more accurate than any comparable technique when a sufficient number of grains are analyzed. Thus, BEKP is well-suited as a verification method for data obtained in faster ways, such as x-ray or neutron diffraction. We have compared texture data obtained using BEKP, x-ray diffraction and neutron diffraction. Alumina specimens displaying differing levels of axisymmetric (0001) texture normal to the specimen surface were investigated.BEKP patterns were obtained from about a hundred grains selected at random in each specimen.

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