Using a Laboratory‐Based Growth Model to Estimate Mass‐ and Temperature‐Dependent Growth Parameters across Populations of Juvenile Chinook Salmon

Perry, Russell W.; Plumb, John M.; Huntington, Charles W.

doi:10.1080/00028487.2014.996667

Cited by 29 publications

(33 citation statements)

References 20 publications

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“…; Perry et al. ). Estimated P obs values tended to increase along a salinity gradient, which may have resulted from the larger body sizes of subyearlings and lower ED prey in the nearshore and offshore environments.…”

Section: Discussionmentioning

confidence: 98%

“…Modeled individual P cmax (P obs ) did not appear to follow consumption patterns that were derived from stomach content analyses. Instead, P obs was directly related to allometry, where larger fish had to consume more to maintain somatic growth rates that were comparable with smaller fish using the same environment (Armstrong et al 2010;Perry et al 2015). Estimated P obs values tended to increase along a salinity gradient, which may have resulted from the larger body sizes of TABLE 5.…”

Section: Discussionmentioning

confidence: 99%

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Freshwater Tidal Forests and Estuarine Wetlands May Confer Early Life Growth Advantages for Delta‐Reared Chinook Salmon

Davis

Woo

Ellings³

et al. 2019

Trans Am Fish Soc

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Large river deltas are complex ecosystems that are believed to play a pivotal role in promoting the early marine growth and survival of threatened Chinook Salmon Oncorhynchus tshawytscha. We used a fish bioenergetics model to assess the functional role of multiple delta habitats across a gradient of salinities and vegetation types, where consumption and growth rate potential (GRP) were considered as proxies for habitat quality. We subsequently compared our model output to empirical, or realized, growth estimates from scale circuli. In terms of consumption, prey energy density (EDprey) was 46–86% higher in tidal freshwater forest than in any other habitat type, while estimated consumption rates (expressed as proportion of maximum daily consumption; Pcmax) were positively correlated with FL. These size‐related differences in Pcmax led to a noticeable increase along a freshwater‐to‐saline gradient from roughly 0.25 in tidal freshwater forest to 0.55 in the offshore subtidal zone, yet despite higher observed Pcmax values in nearshore and offshore habitats, the tidal freshwater forest and emergent salt marsh demonstrated the highest modeled GRP values. Similarly, realized growth rates for fish caught in tidal freshwater forest were up to 0.5% higher per day than for fish caught in the offshore area, but habitat‐level differences were overshadowed by allometry and rearing origin. Scales from unmarked fish (assumed to be of wild origin) indicated that they grew, on average, 11% faster than did hatchery fish; however, these differences were subtle and were more obvious at fork lengths <100 mm. Our results suggest that tidal forests and emergent marshes may offer early life growth advantages for wild Chinook Salmon, but that wild and hatchery fish can compensate as they move seaward by opportunistically consuming greater quantities of low‐energy density prey, taking advantage of pulses of larval forage fish, or by spending time in multiple interconnected habitat types.

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Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

Freshwater Tidal Forests and Estuarine Wetlands May Confer Early Life Growth Advantages for Delta‐Reared Chinook Salmon

Davis

Woo

Ellings³

et al. 2019

Trans Am Fish Soc

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“…As long as fish feed at their maximum rate, warmer water temperatures can yield increases in growth rate until the optimum temperature for growth is reached (Plumb and Moffitt 2015). At water temperatures that exceed this optimum, growth rates decline as energy utilization shifts to support necessary biological functions via increases in metabolic activity (Perry et al 2015). Consequently, a disparity forms between somatic growth and metabolism.…”

Section: Discussionmentioning

confidence: 99%

Growth‐Increment Formation Using Otoliths and Scales for Age‐0 Chinook Salmon

Walker

Sutton

2016

N American J Fish Manag

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Retrospective analysis is used to reconstruct fish body size at previous ages, with size and growth assumed to be accurately reflected by scale circuli and otolith increments. Using a 122‐d laboratory experiment, this study validated the relationship between fish body size and growth with scale circuli and otolith daily growth increments for age‐0 Chinook Salmon Oncorhynchus tshawytscha. Somatic growth was accurately reflected by growth in scale radius and growth in otolith diameter, indicating that growth in these two measures was proportional to growth in fish length. Although the width between scale circuli reflected somatic growth, daily growth was not accurately reflected by the width between corresponding otolith daily increments. Study results showed that fish deposited new otolith increments on a daily basis, but that new scale circuli were deposited at each successive increase of 5 to 6 mm in total length. These findings provide a foundation for future retrospective growth analyses involving Chinook Salmon and allow for the conversion of otolith and scale measurements into fish lengths, which are meaningful in studies of growth and survival. Received November 5, 2015; accepted April 8, 2016 Published online August 26, 2016

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“…Fish experienced warmer temperatures than were generally available, but infrequently experienced temperatures of ~21°C where consumption was predicted to be maximized (Perry et al. ).…”

Section: Resultsmentioning

confidence: 99%

“…Mobile fish sought out temperatures between 9°and 13°C during spring, and between 13°and 18°C during summer, which are similar to reported preferences for juvenile subyearling Chinook Salmon (Richter andKolmes 2005, Tiffan et al 2009). Fish experienced warmer temperatures than were generally available, but infrequently experienced temperatures of~21°C where consumption was predicted to be maximized (Perry et al 2015).…”

Section: Resultsmentioning

confidence: 99%

Simulated juvenile salmon growth and phenology respond to altered thermal regimes and stream network shape

et al. 2017

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Abstract. It is generally accepted that climate change will stress coldwater species such as Pacific salmon. However, it is unclear what aspect of altered thermal regimes (e.g., warmer winters, springs, summers, or increased variability) will have the greatest effect, and what role the spatial properties of river networks play. Thermally diverse habitats may afford protection from climate change by providing opportunities for aquatic organisms to find and use habitats with optimal conditions for growth. We hypothesized that climate-altered thermal regimes will change growth and timing of life history events such as emergence or migration but that changes will be moderated in topologically complex stream networks where opportunities to thermoregulate are more readily available to mobile animals. Because climate change effects on populations are spatially variable and contingent upon physiological optima, assessments of risk must take a spatially explicit approach. We developed a spatially structured individual-based model for Chinook Salmon (Oncorhynchus tshawytscha) in which movement decisions and growth were governed by water temperature and conspecific density. We evaluated growth and phenology (timing of egg emergence and smolting) under a variety of thermal regimes (each having a different minimum, rate of warming, maximum, and variability) and in three network shapes of increasing spatial complexity. Across networks, fish generally grew faster and were capable of smolting earlier in warmer scenarios where water temperatures experienced by fish were closer to optimal; however, growth decreased for some fish. We found that salmon size and smolt date responded more strongly to warmer springs and summers than to warmer winters or increased variability. Fish in the least complex network grew faster and were ready to smolt earlier than fish in the more spatially complex network shapes in the contemporary thermal regime; patterns were similar but less clear in warmer thermal regimes. Our results demonstrate that network topology may influence how fish respond to thermal landscapes, and this information will be useful for incorporating a spatiotemporal context into conservation decisions that promote long-term viability of salmon in a changing climate.

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Using a Laboratory‐Based Growth Model to Estimate Mass‐ and Temperature‐Dependent Growth Parameters across Populations of Juvenile Chinook Salmon

Cited by 29 publications

References 20 publications

Freshwater Tidal Forests and Estuarine Wetlands May Confer Early Life Growth Advantages for Delta‐Reared Chinook Salmon

Freshwater Tidal Forests and Estuarine Wetlands May Confer Early Life Growth Advantages for Delta‐Reared Chinook Salmon

Growth‐Increment Formation Using Otoliths and Scales for Age‐0 Chinook Salmon

Simulated juvenile salmon growth and phenology respond to altered thermal regimes and stream network shape

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