Effect of Temperature on Molt Increment and Intermolt Period of a Juvenile Australian Fresh-Water Crayfish, Cherax destructor

1998 ◽  
Vol 18 (4) ◽  
pp. 673 ◽  
Author(s):  
G. D. Verhoef ◽  
C. M. Austin ◽  
P. L. Jones ◽  
F. Stagnitti
Keyword(s):  
Fresh Water ◽  
Effect Of Temperature ◽  
Intermolt Period ◽  
Cherax Destructor

scholarly journals Effect of temperature on the survival and growth of freshwater prawns Macrobrachium borellii and Palaemonetes argentinus (Crustacea, Palaemonidae)

2011 ◽  
Vol 101 (3) ◽  
pp. 233-238 ◽  
Author(s):  
Marcela C. Montagna
Keyword(s):  
Growth Rate ◽  
Survival Rate ◽  
Anthropogenic Impact ◽  
Effect Of Temperature ◽  
Freshwater Environment ◽  
Intermolt Period ◽  
Different Temperatures ◽  
Cephalothorax Length ◽  
Survival And Growth ◽  
Size Increment

During the two-month rearing period, the effect of four water temperatures (15°C, 20°C, 25°C and 30°C) on survival rate, number of molts, and growth rate (molt increment and intermolt period) of juvenile Macrobrachium borellii Nobili, 1896 and Palaemonetes argentinus Nobili, 1901 prawns was evaluated in laboratory conditions. The two species showed some similarities in their both survival and growth pattern at different temperatures. The survival rate was highest at 20°C and 25°C, decreasing at the lowest temperature. The number of molts increased at higher temperatures, ranging the intermolt period from 22.2 days to 9.9 days, for M. borellii, and from 20.8 to 9.5 days for P. argentinus, corresponding those values to 15°C and 30°C, respectively. No difference between species was noted in the intermolt period. The size increment by molting increased significantly from 15°C to 25°C, whereas a reduction in the growth of prawns was observed at 30°C. Significant differences among temperatures were found in the slope of regressions between the size increment by molting and the cephalothorax length. M. borellii showed a significantly higher tolerance to elevated temperature and a faster growth (about twice at 25°C) than P. argentinus. These differences could provide M. borellii a competitive advantage for a better adaptation to the dynamic of freshwater environment, especially in areas with anthropogenic impact.

Effects of Water Temperature and Salt Concentration on the Characteristics of Horizontal Buoyant Submerged Jets

1980 ◽  
Vol 102 (3) ◽  
pp. 557-562 ◽  
Author(s):  
J. B. Riester ◽  
R. A. Bajura ◽  
S. H. Schwartz
Keyword(s):  
Froude Number ◽  
Fresh Water ◽  
Salt Concentration ◽  
Salt Water ◽  
Flow Characteristics ◽  
Effect Of Temperature ◽  
Horizontal Distance ◽  
Reservoir Temperature ◽  
Water Jets ◽  
Jet Trajectory

This paper summarizes the results of an analytical/experimental study of submerged buoyant fresh water and salt water jets injected horizontally into a quiescent, unstratified reservoir. Fresh water jets of a fixed exit Froude number penetrated to a greater horizontal distance before surfacing as the temperature of the reservoir was lowered. The overall flow characteristics were markedly affected by changes in the reservoir temperature, but were only slightly dependent upon the jet exit temperature for a given reservoir. Salt water jets of a fixed exit Froude number penetrated shorter horizontal distances into the reservoir as the salt concentration was increased. An analytical model was developed for fresh water jets which includes the effect of temperature on the thermal expansion coefficient and the effective buoyancy of the jet. The model successfully predicts the observed temperature dependence in the experiments and is applicable to salt water jets at low concentration levels. A correlation is proposed to minimize the effect of the reservoir temperature on the jet trajectory. The dependence of the flow characteristics on temperature and salt concentration is shown to be a significant factor contributing to the wide discrepancy in the data reported by previous investigators.

Sodium balance in the Australian crayfish Cherax destructor, Euastacus keirensis and E. spinifer (Decapoda : Parastacoidea)

1982 ◽  
Vol 33 (3) ◽  
pp. 507 ◽  
Author(s):  
P Greenaway ◽  
B Lawson
Keyword(s):  
Fresh Water ◽  
Northern Hemisphere ◽  
High Rate ◽  
Sodium Balance ◽  
Sodium Ions ◽  
Sodium Pumps ◽  
Ion Concentrations ◽  
Cherax Destructor

Sodium balance was examined in C. destructor. E. spinifer and E. keirensis to assess the degree of adaptation to fresh water and to permit comparisons with the better known astacoid crayfish of the Northern Hemisphere. The crayfishes had blood ion concentrations close to those reported in the Astacoidea and permeability to sodium ions was similarly low. The affinities of the sodium pumps for sodium ions were relatively low but this was compensated for by an unusually high rate of uptake of sodium following depletion, which enabled sodium balance to be maintained at low external concentrations. Adaptation to fresh water in the species examined is less advanced than in the astacoid species studied.

Nucleation of Disorder in Fe3Al Alloys

1967 ◽  
Vol 25 ◽  
pp. 312-313
Author(s):  
P. R. Swann ◽  
W. R. Duff ◽  
R. M. Fisher
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Annealing Temperature ◽  
Antiphase Domain ◽  
Effect Of Temperature ◽  
Domain Structures ◽  
Transmission Electron ◽  
Domain Boundaries ◽  
Higher Temperature ◽  
The One

Recently we have investigated the phase equilibria and antiphase domain structures of Fe-Al alloys containing from 18 to 50 at.% Al by transmission electron microscopy and Mössbauer techniques. This study has revealed that none of the published phase diagrams are correct, although the one proposed by Rimlinger agrees most closely with our results to be published separately. In this paper observations by transmission electron microscopy relating to the nucleation of disorder in Fe-24% Al will be described. Figure 1 shows the structure after heating this alloy to 776.6°C and quenching. The white areas are B2 micro-domains corresponding to regions of disorder which form at the annealing temperature and re-order during the quench. By examining specimens heated in a temperature gradient of 2°C/cm it is possible to determine the effect of temperature on the disordering reaction very precisely. It was found that disorder begins at existing antiphase domain boundaries but that at a slightly higher temperature (1°C) it also occurs by homogeneous nucleation within the domains. A small (∼ .01°C) further increase in temperature caused these micro-domains to completely fill the specimen.

The effect of temperature on high-resolution TEM image contrast

1995 ◽  
Vol 53 ◽  
pp. 640-641
Author(s):  
T. Geipel ◽  
W. Mader ◽  
P. Pirouz
Keyword(s):  
Form Factor ◽  
Inelastic Scattering ◽  
Accurate Method ◽  
Waller Factor ◽  
Effect Of Temperature ◽  
Specimen Thickness ◽  
Influence Of Temperature ◽  
Debye Waller Factor ◽  
Influence Of Temperature On ◽  
Atomic Form Factor

Temperature affects both elastic and inelastic scattering of electrons in a crystal. The Debye-Waller factor, B, describes the influence of temperature on the elastic scattering of electrons, whereas the imaginary part of the (complex) atomic form factor, fc = fr + ifi, describes the influence of temperature on the inelastic scattering of electrons (i.e. absorption). In HRTEM simulations, two possible ways to include absorption are: (i) an approximate method in which absorption is described by a phenomenological constant, μ, i.e. fi; - μfr, with the real part of the atomic form factor, fr, obtained from Hartree-Fock calculations, (ii) a more accurate method in which the absorptive components, fi of the atomic form factor are explicitly calculated. In this contribution, the inclusion of both the Debye-Waller factor and absorption on HRTEM images of a (Oll)-oriented GaAs crystal are presented (using the EMS software.Fig. 1 shows the the amplitudes and phases of the dominant 111 beams as a function of the specimen thickness, t, for the cases when μ = 0 (i.e. no absorption, solid line) and μ = 0.1 (with absorption, dashed line).

Sign in / Sign up

Export Citation Format

Share Document