AN EFFECT OF DILUTIONS OF SEAWATER ON THE LETHAL TEMPERATURE OF THE GUPPY

1963 ◽  
Vol 41 (6) ◽  
pp. 1011-1015 ◽  
Author(s):  
Mary Needler Arai ◽  
E. T. Cox ◽  
F. E. J. Fry
Keyword(s):  
Thermal Resistance ◽  
Fresh Water ◽  
Lethal Temperature ◽  
Lethal Temperatures ◽  
Two Phases

Two phases of resistance times with decreasing upper lethal temperatures are shown for guppies acclimated to 25 °C, with a more marked increase in resistance between 37° and 36 °C than for the same increment at higher or lower temperatures in fresh water. Increased salinity has little effect at high (39 °C) and low (34°) lethal temperatures. At 38° and 37 °C thermal resistance is increased by ⅛ seawater and still more so by ¼ seawater, as might be expected since the latter is approximately isosmotic. However, at 36° the least resistance is obtained in ¼ seawater.

Influence of osmotic stress on upper lethal temperatures in the cyprinodontid fish Fundulus heteroclitus (L.)

1972 ◽  
Vol 50 (6) ◽  
pp. 787-791 ◽  
Author(s):  
E. T. Garside ◽  
Z. K. Chin-Yuen-Kee
Keyword(s):  
Thermal Stress ◽  
Osmotic Stress ◽  
Fresh Water ◽  
Thermal Tolerance ◽  
Fundulus Heteroclitus ◽  
Thermal Acclimation ◽  
Lethal Temperature ◽  
Lethal Temperatures

Upper lethal temperatures determined for the mummichog Fundulus heteroclitus (L.) for exposures of 10 000 min ranged from 18.58C to 36.31C. Osmotic acclimations were prepared at 0, 14, and 32‰ salinity (S), at thermal acclimations of 5 and 15C, and at 14 and 32‰ S at 25C. Mummichog could not survive in the acclimatory combination of 0‰ S at 25C. Subsamples from these acclimatory combinations were exposed to thermal stress at 0, 14, and 32‰ S. Highest upper lethal temperatures were observed in isosmotic test salinity (14‰). Intermediate lethal levels occurred in seawater (32‰ S) and the lowest lethal temperatures occurred in fresh water (0‰ S). Upper lethal temperature increased with increasing thermal acclimation but generally, prior osmotic experience did not modify thermal tolerance. There was no relation between order of death and size in 18 of the 24 test combinations. In the remaining six, the largest members died first in four and the smallest died first in two test combinations.

SOME LETHAL TEMPERATURE RELATIONS OF TWO MINNOWS OF THE GENUS CHROSOMUS

1966 ◽  
Vol 44 (3) ◽  
pp. 349-364 ◽  
Author(s):  
Albert V. Tyler
Keyword(s):  
Thermal Shock ◽  
High Temperatures ◽  
The Other ◽  
Lethal Temperature ◽  
Lethal Temperatures ◽  
Equal Temperature

The resistance and tolerance of Chrosomus eos and Chrosomus neogaeus to high temperatures were examined. Tests were conducted with C. neogaeus in winter and with C. eos in winter and summer. For both species, death at high temperatures could be separated into three lethal patterns or "effects". The first effect seemed to be associated, at least in part, with thermal shock. Factors generating the other effects were not apparent.Both species showed about the same degree of tolerance and resistance to high temperatures when they were acclimated to 15 °C or higher. At 9 °C, C. eos was less tolerant to high lethal temperatures than was C. neogaeus.When equal temperature acclimations were compared, C. eos was more resistant to high lethal temperatures in summer than in winter.

Temperature Tolerance of Bloater (Coregonus hoyi)

1970 ◽  
Vol 27 (11) ◽  
pp. 2047-2052 ◽  
Author(s):  
Thomas A. Edsall ◽  
Donald V. Rottiers ◽  
Edward H. Brown
Keyword(s):  
Young Adult ◽  
High Temperatures ◽  
Thermal Tolerance ◽  
Brook Trout ◽  
Salvelinus Fontinalis ◽  
Temperature Tolerance ◽  
Lethal Temperature ◽  
Lethal Temperatures ◽  
Coregonus Artedii ◽  
Coregonus Hoyi

Juvenile and young adult bloaters (Coregonus hoyi) were tested for tolerance to high temperatures. The ultimate upper lethal temperature of juvenile bloaters (26.75 C) appeared to be slightly higher than that of young adult bloaters, but was similar to that of juvenile ciscoes, Coregonus artedii (26.0 C), the only other North American coregonine for which a detailed description of temperature tolerance has been published.Regression equations are given that permit estimation of the thermal tolerance when the lethal temperatures are incompletely known. The estimated thermal tolerance of juvenile bloaters (617 units) was slightly less than that of the brook trout (Salvelinus fontinalis; 625 units), but was higher than that of other Salmonidae.

scholarly journals Identification of the tolerant capacity to aquatic environment factors (temperature, pH and dissolved oxygen) of Asian bumblebee catfish (Pseudomystus siamensis Regan, 1913)

2019 ◽  
Vol 18 (5) ◽  
pp. 43-51
Author(s):  
Binh T. T. Vo
Keyword(s):  
Aquatic Environment ◽  
Developmental Stages ◽  
Economic Value ◽  
Lethal Temperature ◽  
Environment Factors ◽  
Lethal Temperatures ◽  
Study Results ◽  
Three Stages ◽  
Ornamental Species ◽  
Scientific Base

Asian bumblebee catfish (Pseudomystus siamensis) belongs to Bagridae family and is an economic value ornamental species. However, biological characteristics of this fish species have been rarely reported in the literature. A study to identify tolerant capacity to aquatic environment factors (incipient lethal temperature (ILT) and incipient lethal pH (ILpH) and oxygen threshold) of Asian bumblebee catfish at three developmental stages namely embryo, hatchling and ten-day post hatching (dph) was carried out from July 2018 to January 2019 at the Experimental Farm for Aquaculture of Fisheries Faculty - Nong Lam University in HCM City. The results showed that the incipient upper and lower lethal temperatures (IULT and ILLT) were 32.5oC and 22.3oC for embryos, 36.7oC and 18.7oC for hatchlings, and 38.6oC and 15.9oC for 10 dph fish, respectively. The incipient upper and lower lethal pHs (IULpH and ILLpH) were 10.7 and 4.4 for embryos, 10.2 and 3.7 for hatchlings, and 10.2 and 3.8 for 10 dph fish, respectively. The oxygen thresholds of the catfish at the three stages were 4.7, 1.1 and 1.0 mg O2/L, respectively. The Asian bumblebee catfish at post hatching stages appears to tolerate to unfavorable environmental factors compared to embryonic one. The study results would be an important scientific base for researches on seed production and conservation of the fish in the future.

scholarly journals Observations on the resistance of Tigriopus fulvus (Fischer) to changes in temperature and salinity

1957 ◽  
Vol 36 (1) ◽  
pp. 115-119 ◽  
Author(s):  
M. R. Ranade
Keyword(s):  
Sea Water ◽  
Recovery Period ◽  
Salinity Range ◽  
Lethal Temperature ◽  
Tolerance Limits ◽  
Lethal Temperatures ◽  
Immersion Period ◽  
Apparent Death

Tigriopus fulvus can live normally within a salinity range of from 4·2 to 90%.In waters of salinities above 90% it falls into a state of apparent death from which it can recover if transferred back to lower salinities.The relation between immersion period and the recovery period is only slightly different at different salinities.The lethal temperatures vary between 32·0 and 41·8°C depending on the salinity of the sea water, the lethal temperature being higher in higher salinities.The fluctuations in salinity and temperature in the pools where the animals were collected are well within their tolerance limits.T. fulvus is well adapted to its habitat.

Upper lethal temperatures of the pelecypod Modiolus demissus in relation to declining environmental temperatures

1972 ◽  
Vol 50 (5) ◽  
pp. 523-527 ◽  
Author(s):  
D. L. Waugh
Keyword(s):  
Ambient Temperature ◽  
Environmental Temperature ◽  
Lethal Temperature ◽  
Winter Habitat ◽  
Lethal Temperatures ◽  
Thermal Acclimatization ◽  
Autumn And Winter ◽  
Environmental Temperatures ◽  
Accurate Reflection ◽  
Ribbed Mussel

Determinations of 24-h upper lethal temperatures of the ribbed mussel Modiolus demissus (Dillwyn) in relation to declining autumn and winter habitat temperatures show effective thermal acclimatization. Upper lethal temperatures ranged from 39.48 ± 0.33C to 37.67 ± 0.08C and the descending range of mean monthly environmental temperature was from 25C to −1.1C. Environmental and test salinity ranged from 28 to 30‰.The regression of lethal temperature on acclimatization temperature is significant when a direct correlation (concomitant) is made between ambient temperature and lethal temperature. Thus, current ambient temperature is an accurate reflection of acclimatization in this species.

Ultimate upper lethal temperature of Atlantic salmon Salmo salar L.

1973 ◽  
Vol 51 (8) ◽  
pp. 898-900 ◽  
Author(s):  
E. T. Garside
Keyword(s):  
Atlantic Salmon ◽  
Fresh Water ◽  
Salmo Salar ◽  
National Park ◽  
Probit Analysis ◽  
Lethal Temperature ◽  
Atlantic Salmon Salmo Salar ◽  
Terra Nova

Parr (70–147 mm) of Atlantic salmon Salmo salar L. from Big Brook, Terra Nova National Park, Newfoundland, were progressively acclimated to 27.5C in fresh water of the home stream, and the upper lethal temperature was determined by probit analysis to be 27.80C ± 0.41. This is essentially the ultimate upper lethal temperature.

scholarly journals Evaluation of an Electrolyte Leakage Technique to Predict St. Augustinegrass Freezing Tolerance

HortScience ◽  
1994 ◽  
Vol 29 (4) ◽  
pp. 316-318 ◽  
Author(s):  
F.P. Maier ◽  
N.S. Lang ◽  
J.D. Fry
Keyword(s):  
Freezing Tolerance ◽  
Low Temperatures ◽  
Electrolyte Leakage ◽  
Field Observations ◽  
Lethal Temperature ◽  
Stenotaphrum Secundatum ◽  
Positive Correlation ◽  
Lethal Temperatures ◽  
Lower Lethal Temperature

Stolons of `Raleigh', `Floratam', and FX-332 St. Augustinegrass [Stenotaphrum secundatum (Walt.) Kuntze] were sampled from the field between October and March in two consecutive years to evaluate accuracy of an electrolyte leakage (EL) method for predicting freezing tolerance. Lethal temperatures of stolons estimated using EL were compared to those obtained by regrowth tests in the greenhouse. Mean lethal low temperatures for regrowth and EL methods over 12 sampling dates were `Floratam', –4.5C (regrowth) vs. –4.4C (EL); FX-332, –4.2C (regrowth) vs. –4.9C (EL); and `Raleigh', –6.0C (regrowth) vs. –5.4C (EL). A positive correlation (r = 0.81) was observed between EL-predicted and regrowth lethal temperatures for `Raleigh', which exhibited some acclimation during the first sampling year. The EL technique consistently predicted a lower lethal temperature for `Raleigh' than for `Floratam', which corroborates field observations concerning freezing tolerance of these two cultivars.

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