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Cited by 13Marine and fisheries researchFish Biology and Ecology StudiesFish Ecology and Management Studies

Assessing Indices of Growth for Field Studies of Juvenile Salmon: An Experiment and Synthesis

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Duguid, William D. P., Iwanicki, Thomas W., Journey, Meredith L., Noel, Amanda L., Beckman, Brian R., Juanes, Francis·2018·Marine and Coastal Fisheries
DOI 10.1002/mcf2.10020
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Abstract

Abstract The hypothesis that size-selective mortality in the first marine year is a major regulator of recruitment in Pacific salmon Oncorhynchus spp. has led to interest in assessing the recent growth of field-caught fish. Understanding differences in relative growth across years, regions, habitats, and prey fields may provide insights into factors influencing survival. Plasma insulin-like growth factor 1 (IGF1), muscle RNA : DNA ratio (RD), and scale circulus spacing have all been used as indices of recent growth in juvenile salmonids. We concurrently assessed these growth rate indices in a laboratory study of postsmolt, young-of-the-year, ocean-type Chinook Salmon O. tshawytscha. We synthesized results with previous work to inform selection of appropriate growth rate indices for field studies on juvenile salmonids. Muscle samples suitable for RD analysis were obtained nonlethally and without subsequent growth impacts, even for very small juvenile salmon (75–99 mm FL). Plasma IGF1 concentration was strongly correlated with growth rate (R2 = 0.79), while loge(RD) and mean spacing of the outer two circuli were moderately correlated with growth rate (R2 = 0.47 and 0.44, respectively). Relationships between the two biochemical indices and growth rate were independent of body size at the start of the experiment. Conversely, initially larger fish formed wider circuli for a given growth rate. Insulin-like growth factor 1 and RD responded to a change in growth conditions within 4 and 6 d, respectively. Rate of circulus formation varied positively with growth rate, meaning that outer circulus spacing indexed shorter periods of growth in faster-growing fish. Our results confirm the value of plasma IGF1 as an index of recent growth in juvenile salmon. Although scales (marginal circulus spacing) and white muscle (RD) can both be sampled nonlethally, scale sampling presents a number of practical advantages.

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  • Insulin-like growth factor 1 reflects growth during the previous 2 weeks in fish.

    “Insulin-like growth factor 1 is produced by the liver and stimulates somatic growth; it reflects growth during the previous 2 weeks (Beckman et al. 1998(Beckman et al. , 2004;;Duguid et al. 2018).”

    From Life in the Fast Lane: Feeding and Growth of Juvenile Steelhead and Chinook Salmon in <scp>Main‐Stem</scp> Habitats of the Columbia River Estuary (2022) · cites this paper as Duguid et al. 2018

    The ‘Insulin-Like Growth Factor 1 Integration Time’ section says IGF1 can resolve differences in growth conditions over approximately 4 days to 2 weeks. The ‘Insulin-Like Growth Factor 1 Relation to Growth’ section links IGF1 to recent growth in Chinook Salmon postsmolts. This supports IGF1 as an indicator of recent growth, but not a fixed previous-2-week window for fish generally. (LLM, conf=0.86)

    Experimental — accuracy not yet measured

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Authors
Duguid, W. D. P., Iwanicki, T. W., Journey, M. L., Noel, A. L., Beckman, B. R., & Juanes, F.
Affiliations
  • University of Victoria (CA)
  • Department of Biology, University of Hawai'i at Mānoa, 2538 McCarthy Mall, Honolulu, Hawaii, 96822, USA
  • Lynker Technologies, 202 Church Street Southeast, Number 536, Leesburg, Virginia, 20175, USA
  • National Oceanic and Atmospheric Administration (US)
Corresponding author
Duguid, William D. P.
ORCID
Venue
Marine and Coastal Fisheries
Publisher
Oxford University Press (OUP)
Published
2018-04-01
Volume
10
Issue
2
Pages
204-223
ISSN
1942-5120 (ISSN-L)
DOI
10.1002/mcf2.10020
OpenAlex
W2800295709
Cited by
13
References
0
Citations by year
2026: 2 · 2025: 1 · 2023: 2 · 2022: 3 · 2021: 2 · 2020: 3
FWCI
0.73
Type
journal article
Language
en
Open access
Licence
Locations
  • Marine and Coastal Fisheries (publishedVersion, cc-by)
  • UVic’s Research and Learning Repository (University of Victoria) (submittedVersion)
  • NOAA Institutional Repository (submittedVersion, cc-by)
Funders
  • Natural Sciences and Engineering Research Council of Canada
  • Liber Ero Endowment Funds
  • Canada Foundation for Innovation
  • British Columbia Knowledge Development Fund
  • NSERC Canada Graduate Scholarship
  • Mitacs Accelerate Fellowship
  • Pacific Salmon Foundation
  • NSERC Discovery
Topics
  • Physical Sciences › Environmental Science › Global and Planetary Change › Marine and fisheries research
  • Life Sciences › Agricultural and Biological Sciences › Aquatic Science › Fish Biology and Ecology Studies
  • Physical Sciences › Environmental Science › Nature and Landscape Conservation › Fish Ecology and Management Studies
Keywords
juvenile salmon, insulin-like growth factor I, RNA/DNA ratio, Oncorhynchus tshawytscha, non-lethal sampling, size-selective mortality, recruitment (biology), white muscle

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