Reduced thiamine utilization by Seneca Lake lake trout embryos and potential implications to restoration of lake trout in the Great Lakes

Fitzsimons, John D.; Brown, Scott; El‐Shaarawi, A. H.

doi:10.1007/s10641-021-01109-4

Cited by 5 publications

(1 citation statement)

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“…Findings in lake trout (Salvelinus namaycush) specifically suggest that genetic variation in thiamine utilization rates may underlie adaptive differences among stocks with different histories of co-occurrence with alewife (Alosa pseudoharengus), a thiaminase-containing prey species (Fitzsimons et al 2021). However, additional data are needed to definitively support the adaptation hypothesis; specifically, individual genetic and fitness data from a single population experiencing low thiamine availability must be sampled at multiple developmental stages and across multiple spawning years to explicitly link differential fitness and specific genetic loci.…”

Section: Genetic Adaptation To Low-thiamine Conditionsmentioning

confidence: 99%

Evolutionary perspectives on thiamine supplementation of managed Pacific salmonid populations

Harder,

Rowland,

Reed

2024

Preprint

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Thiamine deficiency complex (TDC) in fishes has been identified in an ever-expanding list of species and populations. In many documented occurrences of TDC in fishes, rates of juvenile mortality have reached 90% at the population level, with many females producing no surviving offspring. Such sweeping demographic losses and concomitant decreases in genetic diversity due to TDC can be prevented by treating pre-spawn females or fertilized eggs with supplemental thiamine. However, some fisheries managers are hesitant to widely apply thiamine treatments due to the potential for unforeseen evolutionary consequences. Specifically, these hesitations are due in part to apprehension that thiamine supplementation may impede genetic adaptation to low-thiamine conditions or may give hatchery fish an advantage over wild-origin fish. With these concerns in mind, we first review the existing data regarding genetic adaptation to low-thiamine conditions and provide perspectives on evolution-informed treatment strategies with specific population examples. We also provide practical treatment information, consider the potential logistical constraints of thiamine supplementation, and explore the consequences of deciding against supplementation. Until new evidence bolsters or refutes the genetic adaptation hypothesis, we suggest that TDC mitigation strategies should be designed to support maximum population genetic diversity through thiamine supplementation. Furthermore, we offer guidelines on when the adaptation strategy may be applicable to certain populations.

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Section: Genetic Adaptation To Low-thiamine Conditionsmentioning

confidence: 99%