Critical thermal maxima of coho salmon (Oncorhynchus kisutch) fry under field and laboratory acclimation regimes

Juvenile coho salmon (Oncorhynchus kisutch) from three populations in Washington State were captured in the field and tested for critical thermal maximum (CTM). Tolerances varied among the populations (mean CTMs were 28.21, 29.13, and 29.23 °C) and exceeded published data from some laboratory tests. The population from a relatively cool stream had a lower CTM than the two populations from warmer streams. However, after the salmon had been in the laboratory for 3 months under constant, common temperature regimes, the CTMs no longer differed, indicating that the population-specific differences resulted from different acclimation regimes rather than from genetic adaptation.

Download Full-text

THE VALUE OF SHORT-RUN CLIMATE FORECASTS IN MANAGING THE COASTAL COHO SALMON (ONCORHYNCHUS KISUTCH) FISHERY IN WASHINGTON STATE

Natural Resource Modeling ◽

10.1111/j.1939-7445.2007.tb00210.x ◽

2008 ◽

Vol 20 (2) ◽

pp. 321-349 ◽

Cited By ~ 7

Author(s):

JANNE H. KAJE ◽

DANIEL D. HUPPERT

Keyword(s):

Coho Salmon ◽

Oncorhynchus Kisutch ◽

Washington State ◽

Climate Forecasts ◽

Short Run

Download Full-text

The effects of temperature on external egg membranes in coho salmon (Oncorhynchus kisutch) and the occurrence of soft-shell disease

Canadian Journal of Zoology ◽

10.1139/z94-251 ◽

1994 ◽

Vol 72 (10) ◽

pp. 1854-1857 ◽

Cited By ~ 4

Author(s):

Katherine L. Cousins ◽

John O. T. Jensen

Keyword(s):

Coho Salmon ◽

Incubation Temperature ◽

Oncorhynchus Kisutch ◽

Zona Radiata ◽

Temperature Regimes ◽

Soft Shell ◽

Egg Membrane ◽

Shell Disease ◽

Effects Of Temperature ◽

Pore Canals

The occurrence of soft-shell disease in salmon hatcheries in British Columbia was investigated. Soft-shell disease occurred most frequently in chinook (Oncorhynchus tshawytscha) and coho (Oncorhynchus kisutch) salmon, and in years of high water temperature. To test the effects of temperature, coho salmon eggs were incubated in two different temperature regimes (8 and 13 °C) and then subjected to scanning electron microscopy. As incubation progressed, the higher incubation temperature significantly raised the hydrostatic pressure of the egg (p < 0.001), thereby increasing the circumferential tension of the zona radiata. As the surface of the egg increased, the central plugs in the pore canals of the externus were raised upward. At lower temperatures, the surface tension of the egg membrane was reduced and the central plugs retreated into the pore canals. The position of the central plugs in the pore canals of the zona radiata can therefore fluctuate with different temperature regimes. The central plugs appear to be loosely set in the zona radiata, suggesting that this region could provide opportunistic pathogens such as bacteria or fungi with an entry point into the inner egg membrane.

Download Full-text

Landscape characteristics and coho salmon (Oncorhynchus kisutch) distributions: explaining abundance versus occupancy

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f2011-161 ◽

2012 ◽

Vol 69 (3) ◽

pp. 457-468 ◽

Cited By ~ 14

Author(s):

E.A. Steel ◽

D.W. Jensen ◽

K.M. Burnett ◽

K. Christiansen ◽

J.C. Firman ◽

...

Keyword(s):

Coho Salmon ◽

Full Range ◽

Model Performance ◽

Oncorhynchus Kisutch ◽

Monitoring Data ◽

Published Data ◽

Data Sets ◽

Data Set ◽

Landscape Characteristics ◽

Oregon Plan

Distribution of fishes, both occupancy and abundance, is often correlated with landscape-scale characteristics (e.g., geology, climate, and human disturbance). Understanding these relationships is essential for effective conservation of depressed populations. We used landscape characteristics to explain the distribution of coho salmon ( Oncorhynchus kisutch ) in the Oregon Plan data set, one of the first long-term, probabilistic salmon monitoring data sets covering the full range of potential habitats. First we compared data structure and model performance between the Oregon Plan data set and two published data sets on coho salmon distribution. Most of the variation in spawner abundance occurred between reaches but much also occurred between years, limiting potential model performance. Similar suites of landscape predictors are correlated with coho salmon distribution across regions and data sets. We then modeled coho salmon spawner distribution using the Oregon Plan data set and determined that landscape characteristics could not explain presence vs. absence of spawners but that the percentage of agriculture, winter temperature range, and the intrinsic potential of the stream could explain some variation in abundance (weighted average R2 = 0.30) where spawners were present. We conclude that the previous use of nonrandom monitoring data sets may have obscured understanding of species distribution, and we suggest minor modifications to large-scale monitoring programs.

Download Full-text

Temperature preference in two populations of juvenile coho salmon,oncorhynchus kisutch

Environmental Biology of Fishes ◽

10.1007/bf00008256 ◽

1995 ◽

Vol 44 (4) ◽

pp. 417-421 ◽

Cited By ~ 17

Author(s):

John T. Konecki ◽

Carol A. Woody ◽

Thomas P. Quinn

Keyword(s):

Coho Salmon ◽

Oncorhynchus Kisutch ◽

Temperature Preference ◽

Two Populations

Download Full-text

Multivariate regression relationships between ocean conditions and early marine survival of coho salmon (Oncorhynchus kisutch)

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f99-177 ◽

1999 ◽

Vol 56 (12) ◽

pp. 2374-2384 ◽

Cited By ~ 28

Author(s):

Kristen E Ryding ◽

John R Skalski

Keyword(s):

Multivariate Regression ◽

Coastal Upwelling ◽

Coho Salmon ◽

Oncorhynchus Kisutch ◽

Washington State ◽

Sea Surface ◽

Spring Transition ◽

Recorded Data ◽

Marine Survival ◽

Curvilinear Relationships

Washington State hatcheries have released coded wire tagged coho salmon (Oncorhynchus kisutch) since the early 1970s and have recorded data on the number and ages of adult returns. From these data, we isolated marine survival from release to age 2 using a multinomial model incorporating the multivariate structure of the age-at-return data. Only hatcheries on or near the coast were used in the analysis in order to isolate marine effects. Using models to explore linear and curvilinear relationships, early marine survival was regressed against environmental covariates of sea surface temperature (SST), coastal upwelling, and the date of spring transitions. With hatcheries serving as replicates, curvilinear relationships were found between survival and both June SST and the date of spring transition. Maximum survival occurred for a June SST of 13.45°C and for a spring transition date around April 2. The regression results support the idea of optimal environmental conditions for coho salmon survival and may help fisheries managers better understand the dynamics of early marine survival of salmonids.

Download Full-text

Effects of experimental flow manipulations on water quality, hypoxia and growth of Threatened Salish sucker (Catostomus sp. cf. catostomus) and juvenile Coho salmon (Oncorhynchus kisutch)

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/cjfas-2020-0135 ◽

2021 ◽

Author(s):

Kaitlyn R Zinn ◽

Jordan S Rosenfeld ◽

Eric B Taylor

Keyword(s):

Habitat Use ◽

Coho Salmon ◽

Sublethal Effects ◽

Oncorhynchus Kisutch ◽

Washington State ◽

Fish Movement ◽

Pit Tag ◽

Lowland Streams ◽

Flow Reduction ◽

Negative Impacts

The Salish sucker (Catostomus sp. cf. catostomus) is a federally Threatened species in Canada, inhabiting small lowland streams along with juvenile Coho salmon (Oncorhynchus kisutch) in southwestern British Columbia and adjacent Washington State. Experiments were conducted in two ponds to determine the effects of reduced flow on dissolved oxygen (DO), growth of Salish sucker and juvenile Coho salmon, and fish movement using Passive Integrated Transponder (PIT) tags. Sequential flow reduction in the first experiment resulted in a significant decrease in DO (9.1 to 3.1 mg·l-1) and Salish sucker growth (23% decline), although lower DO and growth were confounded with decreased temperature. Flow reduction in a second split-pond experiment including Coho salmon resulted in significantly lower DO (6.9 to 2.9 mg·l-1), a 51% reduction in growth of Coho salmon, but no detectable change in Salish sucker growth. PIT tag detections demonstrated increased use by both species of a well-oxygenated refuge in the flow reduction treatment, indicating sublethal effects of hypoxia on fish behaviour and habitat use. These experiments demonstrate the induction of severe hypoxia by reduced flows under eutrophy, with the potential for negative impacts on Salish sucker and juvenile Coho salmon growth and habitat use.

Download Full-text

Thermal relations and water balance in the day frog, Taudactylus diurnus, from an Australian rain forest

Australian Journal of Zoology ◽

10.1071/zo9710035 ◽

1971 ◽

Vol 19 (1) ◽

pp. 35 ◽

Cited By ~ 7

Author(s):

CR Johnson

Keyword(s):

Water Balance ◽

Water Loss ◽

Rain Forest ◽

Critical Thermal Maximum ◽

Body Temperatures ◽

Original Weight ◽

Thermal Maximum ◽

Critical Thermal Maxima ◽

The Mean ◽

Thermal Relations

Body temperatures, critical thermal maxima, tolerance to water loss, and rehydration rates were measured for T. diurnus in the rain forest on Mt. Glorious, south-eastern Queensland. Body temperatures ranged from 13.6 to 22.8'C (mean 1 8 . 4 i l .g�C) for adults and from 14.0 to 23.8"C (mean 19.852.4"C) for juveniles. Body temperatures were significantly higher in juveniles. The critical thermal maximum for T. diurnus was 31 . l i l . 2 " C and ranged from 28.4 to 33.7"C. Minimal activity temperatures appear to be reached in winter months. The mean lethal water loss for T. diurnus was 26.2 & 4.3 % of the original weight; this species shows less tolerance to desiccation than other Australian anurans that have been studied.

Download Full-text