Acoustically derived fine-scale behaviors of juvenile Chinook salmon (Oncorhynchus tshawytscha) associated with intertidal benthic habitats in an estuary

2008 ◽  
Vol 65 (9) ◽  
pp. 2053-2062 ◽  
Author(s):  
Brice Xavier Semmens
Keyword(s):  
Chinook Salmon ◽  
Oncorhynchus Tshawytscha ◽  
State Space Model ◽  
Benthic Habitat ◽  
Zostera Japonica ◽  
Willapa Bay ◽  
Benthic Habitats ◽  
Growth And Survival ◽  
Resource Managers ◽  
Behavioral Preference

Given the presumed importance of benthic and epibenthic estuarine habitats in Chinook salmon ( Oncorhynchus tshawytscha ) smolt growth and survival, resource managers would be well served by an improved understanding of how smolts use such habitats. A cabled acoustic positioning system was used to precisely track (<1 m resolution) the movement of seventeen 0-aged hatchery-reared fall Chinook smolts in a large (~4000 m2) enclosure over a period of 10 days in Willapa Bay, Washington, USA. A hierarchical Bayesian state–space model of movement was subsequently developed to associate the behaviors of tagged salmon with characteristics of benthic habitat in the enclosure. Model results indicated that smolts had a strong preference for remaining in native eelgrass ( Zostera marina ). Conversely, no such preference existed for other structured benthic habitats such as oyster ( Crassostrea gigas ) beds, non-native eelgrass ( Zostera japonica ), and non-native smooth cordgrass ( Spartina alterniflora ). There was a positive relationship between individual survivorship in the enclosure and the strength of behavioral preference for native eelgrass, suggesting that predator avoidance may be the evolutionary mechanism driving behavioral responses of smolts to benthic habitats.

An Evaluation of Rearing Densities to Improve Growth and Survival of Hatchery Spring Chinook Salmon

2013 ◽  
Vol 4 (1) ◽  
pp. 114-123 ◽  
Author(s):  
Douglas E. Olson ◽  
Michael Paiya
Keyword(s):  
Mortality Rate ◽  
Chinook Salmon ◽  
Oncorhynchus Tshawytscha ◽  
Confounding Factor ◽  
Fork Length ◽  
High Density ◽  
Growth And Survival ◽  
Migration Timing ◽  
Rearing Density ◽  
Salmon Stock

Abstract We evaluated growth and survival of spring Chinook salmon Oncorhynchus tshawytscha reared at varying densities at Warm Springs National Fish Hatchery, Oregon. For three consecutive brood years, density treatments consisted of low, medium, and high groups in 57.8-m3 raceways with approximately 16,000, 24,000, and 32,000 fish/raceway, respectively. Fish were volitionally released in both the autumn and spring to mimic the downstream migration timing of the endemic wild spring Chinook salmon stock. Just prior to the autumn release, the rearing density estimate was 4.24 kg/m3 for the low-density group, 6.27 kg/m3 for the medium-density group, and 8.42 kg/m3 for the high-density group. While weight gain did not differ among density treatments (P  =  0.72), significant differences were found in median fork length (P &lt; 0.001) for fish reared at different densities. Fish reared at high density exhibited the highest on-hatchery mortality rate during two brood years; however, differences in mortality rate among densities were not significant (P  =  0.20). In one brood year, adult recovery rates appeared to support the hypothesis that lower initial densities improved postrelease survival (P &lt; 0.01). All rearing densities utilized in this evaluation were relatively low and may partially explain why more differences were not readily apparent among density groups. In addition, the volitional release was a confounding factor in our study because we were unable to quantify the number of fish released in the autumn.

Effect of Temperature on Initial Feeding in Alevins of Chinook Salmon (Oncorhynchus tshawytscha)

1982 ◽  
Vol 39 (12) ◽  
pp. 1554-1562 ◽  
Author(s):  
T. A. Heming ◽  
J. E. McInerney ◽  
D. F. Alderdice
Keyword(s):  
Chinook Salmon ◽  
Oncorhynchus Tshawytscha ◽  
Food Presentation ◽  
Effect Of Temperature ◽  
Mature Stage ◽  
Growth And Survival ◽  
Fish Size ◽  
Stage Of Development ◽  
Active Feeding ◽  
Feeding Zone

Growth and survival of chinook salmon (Oncorhynchus tshawytscha) during the transition to active feeding were examined in relation to the timing of initial food presentation at 6, 8, 10, and 12 °C. The transition to active feeding in these salmon involved a period of "precocious feeding" during which ingestion of food had no effect on fish size, growth rate, or survival. Initial utilization of food for growth and survival did not coincide with any specific stage of development, but rather it occurred earlier and at a less mature stage of development at higher temperatures. Delays in initial food presentation beyond this point reduced fish size and survival. Temperature and the timing of initial food presentation interacted to create a zone of optimum feeding. Biomass production was maximized when alevins began to feed within this zone, independent of the precise time of initial food presentation or temperature. This optimum feeding zone existed at temperatures below 12 °C, between 905 thermal units (tu) postfertilization and a point (F, tu) which varied with temperature (T, °C) as F = 1201.1 − 20.3 T.Key words: temperature, initial feeding, Oncorhynchus tshawytscha, fish culture

Reduced recruitment of Chinook salmon in a leveed bar-built estuary

2021 ◽  
Author(s):  
Emily K Chen ◽  
Mark J. Henderson
Keyword(s):  
Food Availability ◽  
Chinook Salmon ◽  
Stream Flow ◽  
Oncorhynchus Tshawytscha ◽  
Relative Proportion ◽  
Adult Survival ◽  
Growth And Survival ◽  
Estuary Circulation ◽  
Dynamics And Function ◽  
And Function

Estuaries are commonly touted as nurseries for salmonids, providing numerous advantages for smolts prior to ocean entry. In bar-built estuaries, sandbars form at the mouth of rivers during periods of low stream flow, closing access to the ocean and preventing outmigration. We evaluated how summer residency in a leveed bar-built estuary affects the growth, survival, and recruitment of a Chinook salmon (Oncorhynchus tshawytscha) population. We performed a mark-recapture study on outmigrants to determine juvenile estuary abundance, growth, and survival. We used returning adult scales and otoliths to determine the relative proportion of summer estuary residents in spawning adults. Juveniles in the estuary grew less after mouth closure, and ultimately summer estuary residents had lower smolt-to-adult survival and contributed disproportionately less to the spawning population than juveniles that reared in the ocean their first summer. Mouth closure may lower food availability and deteriorate estuary conditions by reducing marine prey influx and estuary circulation. This research demonstrates the complexity of estuary dynamics and function as salmonid nurseries, particularly when considering the extensive modification of estuaries.

scholarly journals Farm to Fish: Lessons from a Multi-Year Study on Agricultural Floodplain Habitat

2020 ◽  
Vol 18 (3) ◽  
Author(s):  
Ted Sommer ◽  
Brian Schreier ◽  
J. Louise Conrad ◽  
Lynn Takata ◽  
Bjarni Serup ◽  
...  
Keyword(s):  
Chinook Salmon ◽  
Oncorhynchus Tshawytscha ◽  
Central Valley ◽  
Fish Growth ◽  
Severe Drought ◽  
River Channels ◽  
Yolo Bypass ◽  
Agricultural Industry ◽  
Growth And Survival ◽  
Seasonally Flooded

Large areas of California’s historic floodplain have been separated from adjacent river channels by levee construction, allowing the development of an extensive agricultural industry. Based on successful partnerships between agriculture and conservation groups to support migrating waterfowl, we examined whether seasonally flooded rice fields could be modified to provide off-channel rearing habitat for juvenile Chinook Salmon Oncorhynchus tshawytscha. During winter and spring of 2012-2017, we conducted a series of experiments in Yolo Bypass and other regions of California’s Central Valley using hatchery Chinook Salmon as a surrogate for wild Chinook Salmon, the management target for our project. Overall, we found that seasonally flooded fields are highly productive, resulting in significantly higher levels of zooplankton and high Chinook Salmon growth rates as compared to the adjacent Sacramento River. We found similar results for multiple geographical areas in the Central Valley, and in different cover types, such as non-rice crops and fallow areas. Although field substrate type did not detectably affect fish growth and survival, connectivity with upstream and downstream areas appeared to drive fish occupancy, because rearing young salmon were generally attracted to inflow in the fields, and not all of the fish successfully emigrated off the fields without efficient drainage. In general, we faced numerous logistic and environmental challenges to complete our research. For example, periodic unmanaged floods in the Yolo Bypass made it difficult to schedule and complete experiments. During severe drought conditions, we found that managed agricultural habitats produced low and variable salmon survival results, likely because of periodically high temperatures and concentrated avian predation. In addition, our project required substantial landowner time and effort to install and maintain experimental fields. Recent and future infrastructure improvements in Yolo Bypass could substantially improve options for experimental work and broaden efforts to enhance salmon habitat.

Survival of Puget Sound chinook salmon (Oncorhynchus tshawytscha) in response to climate-induced competition with pink salmon (Oncorhynchus gorbuscha)

2004 ◽  
Vol 61 (9) ◽  
pp. 1756-1770 ◽  
Author(s):  
Gregory T Ruggerone ◽  
Frederick A Goetz
Keyword(s):  
Chinook Salmon ◽  
Oncorhynchus Tshawytscha ◽  
Pink Salmon ◽  
Puget Sound ◽  
Oncorhynchus Gorbuscha ◽  
First Year ◽  
Pink Salmon Oncorhynchus Gorbuscha ◽  
Growth And Survival ◽  
Coastal Streams ◽  
Delayed Maturation

We tested for competition between pink salmon (Oncorhynchus gorbuscha) and chinook salmon (Oncorhynchus tshawytscha) originating from rivers in the Puget Sound area using coded-wire-tagged subyearling hatchery chinook salmon. Following a 2-year life cycle, many juvenile pink salmon enter Puget Sound in even-numbered years, whereas few migrate during odd-numbered years. During 1984–1997, juvenile chinook salmon released during even-numbered years experienced 59% lower survival than those released during odd-numbered years, a trend consistent among 13 chinook salmon stocks. Lower even-numbered-year survival of chinook salmon was associated with reduced first-year growth and survival and delayed maturation. In contrast, chinook salmon released into coastal streams, where few pink salmon occur, did not exhibit an alternating-year pattern of survival, suggesting that the interaction occurred within Puget Sound and the lower Strait of Georgia. Unexpectedly, the survival pattern of Puget Sound chinook salmon was reversed prior to the 1982–1983 El Niño: chinook salmon survival was higher when they migrated with juvenile pink salmon during 1972–1983. We hypothesize that chinook salmon survival changed as a result of a shift from predation- to competition-based mortality in response to recent declines in predator and prey abundances and increases in pink salmon abundance. Alternating-year mortality accounted for most of the 50% decline in marine survival of chinook salmon between 1972–1983 and 1984–1997.

scholarly journals Using river temperature to optimize fish incubation metabolism and survival: a case for mechanistic models

2018 ◽  
Author(s):  
James J. Anderson
Keyword(s):  
Chinook Salmon ◽  
Survival Data ◽  
Reservoir Operations ◽  
River Temperature ◽  
Growth And Survival ◽  
The Past ◽  
Density Dependent Mortality ◽  
Resource Managers ◽  
Organism Growth ◽  
New Strategies

AbstractAllocating reservoir flows to societal and ecosystem needs under increasing demands for water and increasing variability in climate presents challenges to resource managers. In the past, managers have operated reservoirs to achieve flow and temperature compliance points based on qualitative predictions of competing needs. Because it is difficult, if not impossible, to assess whether meeting such compliance points is efficient or equitable, new strategies for regulation are being advanced. Critical to these strategies is the need for new models with sufficient biological details to identify the effects of reservoir operations on organism growth and survival in real time. This paper evaluates the adequacy of three models of differing complexity for managing the Sacramento River temperature during the incubation of winter-run Chinook salmon. The models similarly characterize temperature-and density-dependent mortality from egg through fry survival, but use different spatial and temporal resolutions. The models all fit survival data reasonably well, but predict different reservoir operations to protect fish. Importantly, the models with the finer spatial/temporal resolution predict reservoir operations that require less flow and better protect fish when water resources are limited. The paper illustrates that shifting the focus of management from meeting compliance points to meeting the metabolic needs of the organisms’ yields efficiencies and identifies when water is needed and when it can be saved.

Using hierarchical models to estimate stock-specific and seasonal variation in ocean distribution, survivorship, and aggregate abundance of fall run Chinook salmon

2019 ◽  
Vol 76 (1) ◽  
pp. 95-108 ◽  
Author(s):  
Andrew Olaf Shelton ◽  
William H. Satterthwaite ◽  
Eric J. Ward ◽  
Blake E. Feist ◽  
Brian Burke
Keyword(s):  
North America ◽  
Chinook Salmon ◽  
West Coast ◽  
Marine Mammals ◽  
Oncorhynchus Tshawytscha ◽  
State Space Model ◽  
Region Of Origin ◽  
The West ◽  
Or Groups ◽  
Mixed Stock

Ocean fisheries often target and catch aggregations comprising multiple populations or groups of a given species. Chinook salmon (Oncorhynchus tshawytscha) originating from rivers throughout the west coast of North America support mixed-stock ocean fisheries and other ecosystem components, notably as prey for marine mammals. We construct the first coastwide state-space model for fall Chinook salmon tagged fish released from California to British Columbia between 1977 and 1990 to estimate seasonal ocean distribution along the west coast of North America. We incorporate recoveries from multiple ocean fisheries and allow for regional variation in fisheries vulnerability and maturation. We show that Chinook salmon ocean distribution depends strongly on region of origin and varies seasonally, while survival showed regionally varying temporal patterns. Simulations incorporating juvenile production data provide proportional stock composition in different ocean regions and the first coastwide projections of Chinook salmon aggregate abundance. Our model provides an extendable framework that can be applied to understand drivers of Chinook salmon biology (e.g., climate effects on ocean distribution) and management effects (e.g., consequences of juvenile production changes).

Systematic hexamitid (Protozoa: Diplomonadida) Infection in seawater pen-reared Chinook salmon Oncorhynchus tshawytscha

1992 ◽  
Vol 14 ◽  
pp. 81-89 ◽  
Author(s):  
ML Kent ◽  
J Ellis ◽  
JW Fournie ◽  
SC Dawe ◽  
JW Bagshaw ◽  
...  
Keyword(s):  
Chinook Salmon ◽  
Oncorhynchus Tshawytscha
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