Accurate aging of juvenile salmonids using fork lengths

Sethi, Suresh A.; Gerken, Jonathon; Ashline, Joshua

doi:10.1016/j.fishres.2016.09.012

Cited by 13 publications

(14 citation statements)

References 23 publications

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“…Larval lamprey were aged based on established length–frequency distributions (Sethi et al, ). Aging error, particularly in tributaries of low productivity, can lead to individuals from multiple year cohorts being assigned to a single‐year class (Dawson et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…Samples (whole body) were stored in 95% ethanol and delivered to the laboratory at Michigan State University (MSU). In the laboratory, we measured body length for each individual from DC and used a mixture of four Gaussian distributions to group larval body lengths into age 0, age 1, and age 2, age 3+ years (Sethi, Gerken, & Ashline, 2017). We used the DC length-frequency distributions to age larvae from the SCR because of small sample size (Table 1).…”

Section: Sample Field Collectionsmentioning

confidence: 99%

“…Incidence of multiple SNPs per locus means that SNPs could be phased into microhaplotypes, which would potentially increase the number of alleles per locus and our ability to correctly resolve pedigrees (Baetscher et al, 2017). Results collectively suggest further simulation studies would be useful to better understand how violating assumptions re- Larval lamprey were aged based on established length-frequency distributions (Sethi et al, 2017). Aging error, particularly in tributaries of low productivity, can lead to individuals from multiple year cohorts being assigned to a single-year class (Dawson et al, 2009).…”

Section: Analyses Of Simulated and Empirical Pedigreesmentioning

confidence: 99%

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RAPTURE (RAD capture) panel facilitates analyses characterizing sea lamprey reproductive ecology and movement dynamics

Sard

Smith

Homola

et al. 2020

Ecology and Evolution

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Genomic tools are lacking for invasive and native populations of sea lamprey (Petromyzon marinus). Our objective was to discover single nucleotide polymorphism (SNP) loci to conduct pedigree analyses to quantify reproductive contributions of adult sea lampreys and dispersion of sibling larval sea lampreys of different ages in Great Lakes tributaries. Additional applications of data were explored using additional geographically expansive samples. We used restriction site‐associated DNA sequencing (RAD‐Seq) to discover genetic variation in Duffins Creek (DC), Ontario, Canada, and the St. Clair River (SCR), Michigan, USA. We subsequently developed RAD capture baits to genotype 3,446 RAD loci that contained 11,970 SNPs. Based on RAD capture assays, estimates of variance in SNP allele frequency among five Great Lakes tributary populations (mean FST 0.008; range 0.00–0.018) were concordant with previous microsatellite‐based studies; however, outlier loci were identified that contributed substantially to spatial population genetic structure. At finer scales within streams, simulations indicated that accuracy in genetic pedigree reconstruction was high when 200 or 500 independent loci were used, even in situations of high spawner abundance (e.g., 1,000 adults). Based on empirical collections of larval sea lamprey genotypes, we found that age‐1 and age‐2 families of full and half‐siblings were widely but nonrandomly distributed within stream reaches sampled. Using the genomic scale set of SNP loci developed in this study, biologists can rapidly genotype sea lamprey in non‐native and native ranges to investigate questions pertaining to population structuring and reproductive ecology at previously unattainable scales.

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Section: Discussionmentioning

confidence: 99%

Section: Sample Field Collectionsmentioning

confidence: 99%

Section: Analyses Of Simulated and Empirical Pedigreesmentioning

confidence: 99%

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RAPTURE (RAD capture) panel facilitates analyses characterizing sea lamprey reproductive ecology and movement dynamics

Sard

Smith

Homola

et al. 2020

Ecology and Evolution

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“…The proportions of tagged fish across overwinter locations were calculated for each year and age class. Fish were aged as young of year (hatched in spring in a sampling year) or age 1+ (one or more years in fresh water) from fork length measurements at the time of capture for tagging based upon age‐discriminating size thresholds calculated following methods in Sethi, Gerken & Ashline (2017) and Gerken & Sethi (2013). For tracked fish that engaged in overwinter migrations, the distance travelled was calculated as the river network distance between the specimen’s inferred summer rearing location (i.e.…”

Section: Methodsmentioning

confidence: 99%

Connectivity between lentic and lotic freshwater habitats identified as a conservation priority for coho salmon

Sethi

Ashline

Harris

et al. 2021

Aquatic Conservation

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Juvenile Pacific salmon exhibit diverse habitat use and migration strategies to navigate high environmental variability and predation risk during freshwater residency. Increasingly, urbanization and climate‐driven hydrological alterations are affecting the availability and quality of aquatic habitats in salmon catchments. Thus, conservation of freshwater habitat integrity has emerged as an important challenge in supporting salmon life‐history diversity as a buffer against continuing ecosystem changes. To inform catchment management for salmon, information on the distribution and movement dynamics of juvenile fish throughout the annual seasonal cycle is needed. A number of studies have assessed the ecology of juvenile coho salmon (Oncorhynchus kisutch) during summer and autumn seasons; catchment use by this species throughout the annual cycle is less well characterized, particularly in high‐latitude systems. Here, n = 3,792 tagged juvenile coho salmon were tracked throughout two complete annual cycles to assess basin‐wide distribution and movement behaviour of this species in a subarctic, ice‐bearing catchment. Juvenile coho salmon in the Big Lake basin, Alaska, exhibited multiple habitat use and movement strategies across seasons; however, summer rearing in lotic mainstem environments followed by migration to lentic overwinter habitats was identified as a prominent behaviour, with two‐thirds of tracked fish migrating en masse to concentrate in a small subset of upper catchment lakes for the winter. In contrast, the most significant tributary overwintering site (8% of tracked fish) occurred below a culvert and dam, blocking juvenile fish passage to a headwater lake, indicating that these fish may have been restricted from reaching preferred lentic overwinter habitats. These findings emphasize the importance of maintaining aquatic connectivity to lentic habitats as a conservation priority for coho salmon during freshwater residency.

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“…Mixture models have become popular for discriminating distinct modal groups in biological size-frequency datasets, e.g. Laslett et al [51] and Sethi et al [52]. They determine the most likely number of modes in a length-frequency dataset (among many theoretical permutations of modal number) using model performance estimates and then use optimization algorithms to fit one or more Gaussian distribution curves to the data around these modes.…”

Section: Methodsmentioning

confidence: 99%

Reproductive life-history strategies in a species-rich assemblage of Amazonian electric fishes

et al. 2019

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The reproductive biology of only a small fraction of Neotropical freshwater fishes has been described, and detailed comparative studies of reproductive life-history variation in the Neotropical ichthyofauna are lacking. Here we describe interspecific variation in reproductive life history for a multi-species assemblage of the electric knifefish genus Brachyhypopomus (Hypopomidae: Gymnotiformes: Ostariophysi) from Amazonian floodplain and terra firme stream systems. During a year-round quantitative sampling program, we collected and measured key life-history traits from 3,410 individuals. Based on oocyte size distributions, and on circannual variation in gonadosomatic indices, hepatosomatic indices, and capture-per-unit-effort abundance of reproductive adults, we concluded that all species exhibit a single protracted annual breeding season during which females spawn fractionally. We found small clusters of post-larval individuals in one floodplain species and one terra firme stream species, but no signs of parental care. From analyses of body size-frequency distributions and otolith growth increments, we concluded that five species in our study area have approximately one-year (annual) semelparous life history with a single reproductive period followed by death, while two species have a two-year iteroparous life history, with breeding in both year-groups. Despite predictions from life-history theory we found no salient correlations between life history strategy (semelparity or iteroparity) and habitat occupancy (floodplain or terra firme stream). In the iteroparous species B. beebei, we documented evidence for reproductive restraint in the first breeding season relative to the second breeding season and argue that this is consistent with age-regulated terminal investment.

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Accurate aging of juvenile salmonids using fork lengths

Cited by 13 publications

References 23 publications

RAPTURE (RAD capture) panel facilitates analyses characterizing sea lamprey reproductive ecology and movement dynamics

RAPTURE (RAD capture) panel facilitates analyses characterizing sea lamprey reproductive ecology and movement dynamics

Connectivity between lentic and lotic freshwater habitats identified as a conservation priority for coho salmon

Reproductive life-history strategies in a species-rich assemblage of Amazonian electric fishes

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