Role of Size, Condition, and Lipid Content in the Overwinter Survival of Age −0 Colorado Squawfish

Thompson, Jay; Bergersen, Eric P.; Carlson, Clarence A.; Kaeding, Lynn R.

doi:10.1577/1548-8659(1991)120<0346:roscal>2.3.co;2

Cited by 139 publications

(144 citation statements)

References 22 publications

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“…Despite the increasing temporal trend in Humpback Chub length-weight relationships in the Little Colorado River, condition in this important tributary is still below that of juvenile Humpback Chub occupying the mainstem Colorado River. Researchers have reported relationships between energy reserves and overwinter survival for a variety of other fish species (Thompson et al 1991;Ludsin and DeVries 1997), and the unexpected relationship between mainstem Colorado River occupancy and higher condition we observed merits further study given other similar surprises in Humpback Chub life history that were described by Limburg et al (2013) and Yackulic et al (2014).…”

Section: Discussionsupporting

confidence: 63%

“…This counterintuitive response indicates that Humpback Chub in Grand Canyon may be food-limited, even if optimal temperatures and more natural flow regimes are experimentally provided. (1991, 1992, 1993, 1998, 1999, 2011) and Little Colorado River (1991, 1992, 1993, 1994, 2011, including data collected during August, September, and October. See Table 1, comparison 2 (Colorado River) and comparison 3 (Little Colorado River), for parameter estimates.…”

Section: Discussionmentioning

confidence: 99%

“…Important future research might examine how wild Humpback Chub respond when water temperatures reach and surpass the 148C threshold, especially because growth (Finch et al 2014) and survival (Finch et al 2015) of juvenile Humpback Chub can have counterintuitive responses to more natural flow regimes. For juvenile Colorado Pike Minnow Ptychocheilus lucius, Thompson et al (1991) found that lipid levels were related to survival and condition. If a similar relationship exists for Humpback Chub, tracking condition by routinely weighing juvenile fish could create a framework for a relatively low-cost additional line of inference on juvenile Humpback Chub population response to changing environmental conditions or management actions.…”

Section: Discussionmentioning

confidence: 99%

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Body Condition of Endangered Humpback Chub in Relation to Temperature and Discharge in the Lower Colorado River

Hayes

Dodrill

Gerig

et al. 2017

Journal of Fish and Wildlife Management

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Determining the population status of endangered Humpback Chub Gila cypha is a major component of the adaptive management program designed to inform operation of Glen Canyon Dam upstream from Grand Canyon, Arizona. In recent decades, resource managers have identified a portfolio of management actions (with intermittent implementation) to promote population recovery of Humpback Chub, including nonnative fish removal, changes in water release volumes and discharge ramping schedules, and reductions in hydropower peaking operations. The Humpback Chub population in Grand Canyon has increased over this same period, causal factors for which are unclear. We took advantage of unusual hydrology in the Colorado River basin in 2011 to assess trends in juvenile Humpback Chub length-weight relationships and condition in the Colorado River below Glen Canyon Dam as well as in the unregulated Little Colorado River. Within each river, we observed higher length-weight b-parameter estimates (exponent of the standard power equation) at higher water temperatures. We also found higher slope estimates for the length-weight relationship at higher temperatures in the Little Colorado River. Slope estimates were more variable in the Colorado River, where mean water temperatures were more uniform. The next step is to examine whether Humpback Chub length-weight relationships influence population metrics such as abundance or survival. If these relationships exist, then monitoring condition in juvenile Humpback Chub would provide a quick and low-cost technique for assessing population response to planned management experiments or changing environmental conditions.

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Section: Discussionsupporting

confidence: 63%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Body Condition of Endangered Humpback Chub in Relation to Temperature and Discharge in the Lower Colorado River

Hayes

Dodrill

Gerig

et al. 2017

Journal of Fish and Wildlife Management

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“…As such, condition of individual fish may play a critical role in recruitment variability. For example, lipid content, a measure of fish condition, is associated with improved survival during periods of reduced feeding activity, as seen in short-term (<1 mo) studies with larvae (Lochmann et al 1995, Booth & Alquezar 2002 and long term (> 4 mo) studies with juveniles (Thompson et al 1991, Simpkins et al 2003. Feeding history and nutritional insufficiency (e.g.…”

Section: Introductionmentioning

confidence: 99%

Temporal dynamics of condition for estuarine fishes in their nursery habitats

Schloesser¹,

Fabrizio²

2016

Mar. Ecol. Prog. Ser.

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The condition of individuals in a year class may contribute to recruitment variability due to differential survival of poor-and well-conditioned fish, but the temporal dynamics of juvenile fish condition are poorly understood. We examined inter-and intra-annual dynamics of condition for juveniles of 3 species collected from estuarine nursery areas of Chesapeake Bay from November 2010 to June 2014. We describe temporal patterns in length-based indices, the hepatosomatic index (HSI), and relative subdermal lipid estimates for juvenile summer flounder Paralichthys dentatus (n = 1771), Atlantic croaker Micropogonias undulatus (n = 3911), and striped bass Morone saxatilis (n = 874). Multiple indices provided a more complete understanding of energy-storage strategies for juveniles because temporal patterns among condition indices were not congruent for a given species. Most juvenile summer flounder and Atlantic croaker migrate from Chesapeake Bay in the fall, and both species exhibited increases in subdermal lipids in the time period prior to migration. For all species, individuals that remained in the estuary during winter exhibited high HSI values, indicating a common energy-storage strategy during winter. Mean condition of juveniles varied among year classes, but differences were inconsistent among indices, suggesting that energy was differentially stored among tissues for these year classes. Densitydependent effects contributed to variation in mean condition for summer flounder and striped bass. Our understanding of recruitment variability may be improved by assessing annual differences in mean condition as revealed by multiple indices.

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“…For another native species in the Colorado River basin (Colorado pikeminnow Ptychocheilus lucius), a positive relationship has been shown between fish condition, size, and survival (Thompson et al 1991). This relationship has not been been examined for Humpback Chub.…”

mentioning

confidence: 99%

Characterizing Growth and Condition of Endangered Humpback Chub in the Lower Colorado River

Pine

Gerig

Finch

2017

Journal of Fish and Wildlife Management

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This paper is a preface to the two papers that follow in this issue. The two papers (by Pine et al. and Hayes et al.) use long-term fish sampling data from ongoing Humpback Chub monitoring efforts and archival otolith samples (from museums) collected in the lower Colorado and Little Colorado Rivers during periods of both cold-and warm-water conditions to assess whether Humpback Chub growth characteristics may have responded to changes in water temperature. Growth patterns are often of interest to resource managers because growth integrates a large range of environmental and ecological factors, including habitat conditions. Together, these papers contribute information to a large collection of recent studies, developing a line of evidence designed to inform management decisions related to water releases, dam operations, and management actions that could be taken to aid recovery of native fish populations in regulated river systems around the world.

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Role of Size, Condition, and Lipid Content in the Overwinter Survival of Age −0 Colorado Squawfish

Cited by 139 publications

References 22 publications

Body Condition of Endangered Humpback Chub in Relation to Temperature and Discharge in the Lower Colorado River

Body Condition of Endangered Humpback Chub in Relation to Temperature and Discharge in the Lower Colorado River

Temporal dynamics of condition for estuarine fishes in their nursery habitats

Characterizing Growth and Condition of Endangered Humpback Chub in the Lower Colorado River

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