Notes: Estimating the Energy Density of Daphnid Prey for Use with Rainbow Trout Bioenergetics Models

Luecke, Chris; Brandt, Darren H.

doi:10.1577/1548-8659(1993)122<0386:netedo>2.3.co;2

Cited by 37 publications

(29 citation statements)

References 6 publications

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“…However, because our objective was to estimate population-level consumption rather than the individual performance of fry, we simplified the growth patterns to reflect the modal body mass of the population. From Feb- Luecke and Brandt (1993). b Values for chironomid pupae were averaged for larval (Hanson et al 1997) ruary through late March 2001, the mean sizes of sockeye salmon fry sampled nearshore in beach seines and offshore in surface trawls were very similar (Table 1), exhibited minimal variability, and were consistent with the size of fry leaving the Cedar River (analysis of variance [ANOVA], P Ͼ 0.20).…”

Section: Bioenergetics Modelingmentioning

confidence: 84%

Spatial–Temporal Dynamics of Early Feeding Demand and Food Supply for Sockeye Salmon Fry in Lake Washington

et al. 2004

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We compared temporal consumption rates by sockeye salmon Oncorhynchus nerka fry with food supply to evaluate how different survival and dispersal rates or additional hatchery production affected the winter carrying capacity of Lake Washington, Washington. Peak immigration of sockeye salmon fry into southern Lake Washington precedes the spring zooplankton bloom by 2–3 months. Zooplankton density, fish diet, and growth were sampled during winter and spring 2001, when a record 52.4 million fry entered the lake. Supplementary information on the distribution and dispersal of fry was collected in 2002 and 2003. We used bioenergetics modeling to estimate the temporal–spatial consumption by fry during early lake rearing. Cyclops bicuspidatus were dominant in the diet and zooplankton assemblage but declined from more than 30/L in late February and early March to fewer than 5/L during mid‐March and early April. Fry ate significantly larger Cyclops than the average size in the lake; approximately 83% of the food items in the stomachs were larger than 0.8 mm, which was the minimum food item size. Hydroacoustics and midwater trawling surveys during 2002 and 2003 suggested that fry dispersed quickly over the southern half of the lake and used depths of 0–30 m. Under the most realistic scenarios for fry dispersal, feeding, and survival, total consumption of all prey by sockeye salmon fry represented 5% of the average monthly biomass of Cyclops during March and early April, when their availability was lowest. Potential bottlenecks in the availability of Cyclops only developed in simulations when fry were restricted to feeding in 0–10‐m depths in the southernmost region of the lake. Despite the seemingly adequate food supply for sockeye salmon fry, other planktivores also consume significant fractions of the exploitable prey biomass, and the interannual availability of exploitable zooplankton varies considerably during winter and early spring. Either of these factors could impinge on the localized food supply for sockeye salmon and other species during some years and should be considered in the adaptive management of any enhancement program.

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Section: Bioenergetics Modelingmentioning

confidence: 84%

Spatial–Temporal Dynamics of Early Feeding Demand and Food Supply for Sockeye Salmon Fry in Lake Washington

et al. 2004

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“…Adult insects (e.g., adult dipterans) are calorically more valuable (energy densities of up to 8.92 kJ/g wet mass [wm]; David et al. ) than zooplankton (Cladocera: 1.32 kJ/g wm; Calanoida: 4.6 kJ/g wm; Luecke and Brandt ; David et al. ).…”

Section: Discussionmentioning

confidence: 99%

Effects of Extreme Hydrologic Regimes on Juvenile Chinook Salmon Prey Resources and Diet Composition in a Large River Floodplain

Goertler¹,

Jones²,

Cordell

et al. 2018

Trans Am Fish Soc

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Climate and hydrologic variability are defining characteristics of California rivers. Recently, the region experienced an unprecedented drought, and the probability of similarly warm, dry conditions is predicted to increase. In addition to warming air and water temperatures, climate change projections predict increased flooding and sea level rise, likely aggravating the water resource issues that already challenge the western United States. Water managers balance many public interests, including the conservation of native fishes, such as the Chinook Salmon Oncorhynchus tshawytscha. Given projected changes in climate and hydrology, there is an urgent need to understand how salmon respond to these conditions. In this study, we examined how young salmon responded to extreme drought (2012–2015) versus flood (1998–1999) conditions in the Yolo Bypass, a floodplain–tidal slough complex of the Sacramento River, California. We found that the diets of juvenile Chinook Salmon were dominated by aquatic–riparian insects during flooding and were dominated by zooplankton during the drought. Although juvenile salmon that were caught during the drought seemed to have eaten a higher number of prey items on average, they also had higher metabolic costs. Therefore, it is likely that juvenile salmon must augment their foraging behavior to offset higher temperatures and prey shifts. Finally, preferentially consumed, calorically valuable prey (i.e., larger zooplankton and aquatic–riparian insects) have become rare due to habitat degradation and biological invasions, and resource managers must consider re‐establishing productive off‐channel habitats, such as riparian corridors, floodplains, and wetlands.

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“…Parameter RA (Hewell and Johnson 1987) was changed from 0.00264 to 0.002076. Energy density of Daphnia prey \VII assumed to be 3.77 kJ/g wet weight (Luecke and Brandt 1993). For the rest of the diet, which iJl.…”

Section: Methodsmentioning

confidence: 99%

Effects of Daphnia Availability on Growth and Food Consumption of Rainbow Trout in Two Utah Reservoirs

Tabor

Luecke

Wurtsbaugh

1996

North American Journal of Fisheries Management

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Notes: Estimating the Energy Density of Daphnid Prey for Use with Rainbow Trout Bioenergetics Models

Cited by 37 publications

References 6 publications

Spatial–Temporal Dynamics of Early Feeding Demand and Food Supply for Sockeye Salmon Fry in Lake Washington

Spatial–Temporal Dynamics of Early Feeding Demand and Food Supply for Sockeye Salmon Fry in Lake Washington

Effects of Extreme Hydrologic Regimes on Juvenile Chinook Salmon Prey Resources and Diet Composition in a Large River Floodplain

Effects of Daphnia Availability on Growth and Food Consumption of Rainbow Trout in Two Utah Reservoirs

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