scholarly journals Temporal and spatial differences in smolting among sockeye salmon (Oncorhynchus nerka) populations throughout fresh- and seawater migration and the effect of water temperature on the smolt window

2015 ◽  
Author(s):  
Marley Carter Bassett
Keyword(s):  
Water Temperature ◽  
Sockeye Salmon ◽  
Oncorhynchus Nerka ◽  
Effect Of Water ◽  
Spatial Differences ◽  
Temporal And Spatial

High river temperature reduces survival of sockeye salmon (Oncorhynchus nerka) approaching spawning grounds and exacerbates female mortality

2012 ◽  
Vol 69 (2) ◽  
pp. 330-342 ◽  
Author(s):  
Eduardo G. Martins ◽  
Scott G. Hinch ◽  
David A. Patterson ◽  
Merran J. Hague ◽  
Steven J. Cooke ◽  
...  
Keyword(s):  
Water Temperature ◽  
Sockeye Salmon ◽  
Oncorhynchus Nerka ◽  
Thermal Conditions ◽  
Fraser River ◽  
Female Mortality ◽  
River Section ◽  
Spawning Grounds ◽  
River Temperature ◽  
Related Mortality

Recent studies have shown that warm temperatures reduce survival of adult migrating sockeye salmon ( Oncorhynchus nerka ), but knowledge gaps exist on where high-temperature-related mortality occurs along the migration and whether females and males are differentially impacted by river temperature. In this study, we monitored 437 radio-tagged Fraser River sockeye salmon and used capture–mark–recapture modelling approaches to investigate whether river thermal conditions differentially influence (i) spatial patterns of survival along a 413-km stretch of migration and (ii) survival of the sexes. Regardless of water temperature, survival decreased in the river section containing the most hydraulically difficult passages of the migration. However, when water temperature was warm (19 °C), survival decreased even further in the final 186 km of the migration prior to reaching the spawning grounds, particularly in females. Female and male survival differed but only when they experienced warm river temperatures. Under such conditions, the overall freshwater migration survival of males was 1.6 times higher (0.79 ± 0.09 standard error, SE) than that of females (0.50 ± 0.11 SE). As maturing female sockeye salmon maintain higher levels of plasma cortisol compared with males, we suspect that females could be immuno-compromised and thus less resistant to pathogens whose rates of development are accelerated by warm temperatures.

Control of Infectious Hematopoietic Necrosis Virus Disease by Elevating the Water Temperature

1970 ◽  
Vol 27 (2) ◽  
pp. 265-270 ◽  
Author(s):  
Donald F. Amend
Keyword(s):  
Elevated Temperature ◽  
Water Temperature ◽  
Sockeye Salmon ◽  
Virus Disease ◽  
Oncorhynchus Nerka ◽  
Infectious Hematopoietic Necrosis Virus ◽  
Temperature Treatment ◽  
Necrosis Virus ◽  
Infectious Hematopoietic Necrosis

Studies were performed to determine if increasing water temperatures could control infectious hematopoietic necrosis virus (IHN) disease in sockeye salmon (Oncorhynchus nerka). Mortalities could be prevented if the water temperature was raised to at least 18 C within the first 24 hr after infection of the fish and if the fish were maintained at this temperature for 4–6 days. The disease did not recur after the elevated temperature treatment, but the fish would still contract the disease if they were reinfected. Reasons for the protecting action are discussed.

scholarly journals Evaluation of water temperature effects on adult sockeye salmon (Oncorhynchus nerka) behavior in the Yakima River, Washington, 2019

2020 ◽  
Author(s):  
Tobias J. Kock ◽  
Scott D. Evans ◽  
Amy C. Hansen ◽  
Brian K. Ekstrom ◽  
Richard Visser ◽  
...  
Keyword(s):  
Water Temperature ◽  
Temperature Effects ◽  
Sockeye Salmon ◽  
Oncorhynchus Nerka ◽  
Yakima River

Allele frequency stability in large, wild exploited populations over multiple generations: insights from Alaska sockeye salmon (Oncorhynchus nerka)

2012 ◽  
Vol 69 (5) ◽  
pp. 916-929 ◽  
Author(s):  
Daniel Gomez-Uchida ◽  
James E. Seeb ◽  
Christopher Habicht ◽  
Lisa W. Seeb
Keyword(s):  
Sockeye Salmon ◽  
Oncorhynchus Nerka ◽  
Temporal Changes ◽  
Allele Frequencies ◽  
Annual Number ◽  
Data Sets ◽  
Nucleotide Polymorphisms ◽  
Snp Data ◽  
Spatial Differences ◽  
The Stability

We genotyped nuclear and mitochondrial single nucleotide polymorphisms (SNPs) in six paired archived and contemporary collections of Alaskan sockeye salmon ( Oncorhynchus nerka ) to evaluate the stability of allele frequencies over 25–42 years (4.9–8.4 generations). First, our results show that temporal changes were dramatically (between 40- and 250-fold) smaller than spatial differences in allele frequencies when based on nuclear SNPs. Second, the magnitude of temporal change was consistent with a model of genetic drift: (i) SNPs with high levels of differentiation (large θ) and candidates for diversifying selection were not more likely to show significant temporal changes than small-θ SNPs; and (ii) the fraction of single-locus significant tests was consistent with theoretical predictions relating sample size and the annual number of breeders (Nb). Third, estimates of Nb were bound by infinitely large upper 95% confidence intervals, except for one paired collection with unique life-history attributes of both a smoltification phase and generation time shorter than the other paired collections. Use of multigenerational SNP data sets seems a safe practice in management of Alaska sockeye salmon that could be extended to other large, wild aquatic populations.

Effect of water temperature, timing, physiological condition, and lake thermal refugia on migrating adult Weaver Creek sockeye salmon (Oncorhynchus nerka)

2010 ◽  
Vol 67 (1) ◽  
pp. 70-84 ◽  
Author(s):  
M. Todd Mathes ◽  
Scott G. Hinch ◽  
Steven J. Cooke ◽  
Glenn T. Crossin ◽  
David A. Patterson ◽  
...  
Keyword(s):  
Water Temperature ◽  
Sockeye Salmon ◽  
Physiological Condition ◽  
Physiological Stress ◽  
Oncorhynchus Nerka ◽  
Threshold Value ◽  
Large Temperature ◽  
Spawning Grounds ◽  
Thermal Refugia ◽  
River Fish

We coupled physiological biopsy and positional telemetry to examine survival to reach spawning grounds in relation to water temperature, timing, physiological condition, and holding location (river or lake) in adult migrating sockeye salmon ( Oncorhynchus nerka ). We tracked 83 fish across a large temperature range (13.5–21.5 °C), which included record highs. Only early-timed migrants that held in Harrison Lake survived to reach spawning grounds (16%, or n = 4). Normal-timed fish, those that migrated at historically observed times, survived at higher levels if they held in Harrison River (72%, or n = 18). Mortalities were identified on the bottoms of both the lake and river. Hypothetical degree-day (DD) accumulation revealed that early-timed river fish would have greatly surpassed (~800 °C DD) a critical disease threshold value (~500 °C DD). There was no difference in hypothetical DD accumulation between normal-timed river fish and early-timed lake fish. Early-timed sockeye had elevated physiological stress (e.g., plasma lactate, glucose, and hematocrit), which may have contributed to high levels of mortality. By using lakes as thermal refugia, early-timed fish likely reduce rates of disease development and may better recover from physiological stress associated with high encountered temperatures.

scholarly journals Swimming performance of the freshwater neotropical fish: Pimelodus maculatus Lacepède, 1803

2008 ◽  
Vol 68 (2) ◽  
pp. 433-439 ◽  
Author(s):  
HA. Santos ◽  
PS. Pompeu ◽  
GS. Vicentini ◽  
CB. Martinez
Keyword(s):  
Water Temperature ◽  
Critical Speed ◽  
Sockeye Salmon ◽  
Swimming Performance ◽  
Oncorhynchus Nerka ◽  
Neotropical Fish ◽  
Total Length ◽  
Experimental Apparatus ◽  
Guidance Systems ◽  
Pimelodus Maculatus

The present study used fixed and increasing velocity tests in an experimental apparatus based on Brett's respirometer to examine prolonged and sustained speeds of the "mandi-amarelo", Pimelodus maculatus. When comparing the curves of critical speed versus total length between the mandi and the sockeye salmon Oncorhynchus nerka, it is observed that for an equal total length, the mandi presents a greater speed, probably due to water temperature differences. The sustained speed for the species was estimated in 5 lengths per second and the percentage of fatigued fish within time in a certain velocity was established. The data raised for the mandi represents an important contribution to the improvement of the handling of the species, providing guidance and criteria for designing several structures, such as fishways, fish screens and guidance systems.

Effect of Water Temperature on the Egg Hatch and Early Growth of Walleye Pollock (Gadus chalcogrammus)

2020 ◽  
Vol 32 (2) ◽  
pp. 78-83
Author(s):  
Jin Choi ◽  
Gyeong Sik Han ◽  
Ki Wook Lee ◽  
Soon-Gyu Byun ◽  
Hyun Jeong Lim ◽  
...  
Keyword(s):  
Water Temperature ◽  
Early Growth ◽  
Walleye Pollock ◽  
Egg Hatch ◽  
Effect Of Water

scholarly journals TEMPERATURE-SENSITIVE MUTATIONS OF THE NOTCH LOCUS IN DROSOPHILA MELANOGASTER

Genetics ◽  
1975 ◽  
Vol 81 (1) ◽  
pp. 143-162 ◽  
Author(s):  
David L Shellenbarger ◽  
J Dawson Mohler
Keyword(s):  
Temperature Shift ◽  
Temperature Sensitive ◽  
Spatial Differences ◽  
Region Temperature ◽  
Complex Locus ◽  
Notch Locus ◽  
Temporal And Spatial ◽  
Chemical Conditions ◽  
Interallelic Complementation ◽  
The Right

ABSTRACT Temperature-conditional mutations of the Notch locus were characterized in an attempt to understand the organization of a "complex locus" and the control of its function in development. Among 21 newly induced Notch alleles, about one-half are temperature-conditional for some effects, and three are temperature-sensitive for viability. One temperature-sensitive lethal, l(1)Nts1, is functionally non-complementing for all known effects of Notch locus mutations and maps at a single site within the locus. Among the existing alleles involved in complex patterns of interallelic complementation, Ax59d5 is found to be temperature-sensitive, while fag, spl, and l(1)N are temperature-independent. Whereas temperature-sensitive alleles map predominantly to the right-most fifth of the locus, fag, spl, and l(1)N are known to map to the left of this region. Temperature-shift experiments demonstrate that fag, spl, and l(1)N cause defects at specific, non-overlapping times in development.—We conclude (1) that the Notch locus is a single cistron (responsible for a single functional molecule, presumably a polypeptide); (2) that the right-most fifth of the locus is, at least in part, the region involved in coding for the Notch product; (3) that the complexity of interallelic complementation is a developmental effect of mutations that cause defects at selected times and spaces, and that complementation occurs because the mutant defects are temporally and spatially non-overlapping; and (4) that mutants express selected defects due to critical temporal and spatial differences in the chemical conditions controlling the synthesis or function of the Notch product. The complexity of the locus appears to reside in controlling the expression (synthesis or function) of the Notch product in development.

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