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Silencing the Spark: CRISPR/Cas9 Genome Editing in Weakly Electric Fish

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Epigenetics in Captivity: Restoring Wild Phenotypes in Captive-Reared Salmonids.

Tia Attfield¹, Andrew Honsey², Amanda Ackiss²

¹Department of Biological Sciences University of Alberta Edmonton Alberta Canada.

Evolutionary Applications

|April 22, 2026

Summary

Captive rearing alters fish epigenomes, causing phenotypic changes that reduce wild fitness. Understanding DNA methylation is key to improving hatchery protocols and increasing fish survival.

Keywords:

DNA methylation conservation ecology hatchery management phenotype salmonids supplementation

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Area of Science:

Aquatic ecology
Genetics
Epigenetics

Background:

Captive rearing is vital for fish conservation but can lead to reduced fitness in wild populations.
Limited genetic differences between wild and captive fish suggest epigenetic factors, like DNA methylation, may drive phenotypic changes.

Purpose of the Study:

To synthesize knowledge on epigenome-environment interactions in captive fish.
To explore DNA methylation's role in phenotypic alterations and evaluate strategies to mitigate these effects.

Main Methods:

Review of existing literature on captive rearing, epigenetics, and salmonid species.
Analysis of DNA methylation's links to behavioral, color, microbiome, and developmental changes.
Examination of hatchery modifications and epigenetic buffering strategies.

Main Results:

Captive rearing induces epigenetic modifications (DNA methylation) that parallel phenotypic changes across salmonid species.
Heritability and persistence of epigenetic effects vary, with potential for epigenetic buffering to enhance survival.
Novel epigenomic biomarkers offer non-lethal monitoring of post-release effects.

Conclusions:

Integrating epigenetics into hatchery management is crucial for optimizing captive rearing and minimizing ecological impacts.
Further collaborative research is needed to understand comprehensive effects and enhance population resilience.
Exploiting epigenetic mechanisms can improve post-release survival and inform conservation strategies.