Genetic Structure and Management of Aquatic Species

The genetic architecture of aquatic species underpins their ecological resilience, adaptive potential and suitability for conservation or aquaculture. Studies of population subdivision, gene flow and genetic diversity employ molecular markers—such as single nucleotide polymorphisms and microsatellites—to resolve fine-scale structure across wild and cultured stocks. Insights into effective population size, levels of heterozygosity and patterns of connectivity guide the design of breeding programmes, restocking initiatives and habitat management. Integrating genomic data with ecological metrics and life-history traits informs sustainable harvest strategies, enhances stock enhancement outcomes and mitigates the risks of inbreeding or loss of local adaptation. This synthesis highlights how genomic tools are reshaping the management of finfish and shellfish worldwide, promoting both biodiversity conservation and responsible aquaculture expansion.

Research from Nature Portfolio

Recent studies have revealed that the circumglobal yellowtail kingfish exhibits distinct Pacific demes rather than a single panmictic species, with genomic analyses demonstrating three discrete populations in the northeast, northwest and south Pacific. Levels of mitochondrial and nuclear divergence fall within intraspecific ranges, supporting population-level management rather than species-level delineation. Complementary work has identified shallow seamounts as biogeographical islands for the same species, where isolated breeding aggregations at remote features show both genetic and phenotypic differentiation. These findings challenge assumptions of high connectivity in pelagic fishes and underscore the importance of site-specific conservation and hatchery protocols.

Genetic Structure and Management of Aquatic Species publication trend

The graph below shows the total number of articles in genetic structure and management of aquatic species across all publications each year (not limited to Nature Index journals).

Technical terms

Single Nucleotide Polymorphism (SNP): A single-base variation in DNA used as a marker to assess population structure and diversity.

Microsatellite: A repetitive DNA motif with high allelic variability employed to measure genetic relatedness and heterozygosity.

Effective Population Size (Ne): The number of breeding individuals in a population that contribute genetically to subsequent generations.

Gene Flow: The transfer of alleles between populations through migration or exchange of reproductive material.

Heterozygosity: The presence of different alleles at a locus within an individual or population, indicating genetic variation.

References

1. Genomic DNA variation confirmed Seriola lalandi comprises three different populations in the Pacific, but with recent divergence. Scientific Reports (2017).
2. Shallow seamounts represent speciation islands for circumglobal yellowtail Seriola lalandi. Scientific Reports (2021).
3. Maintenance of Genetic Diversity of Black Sea Bream despite Unmonitored and Large-Scale Hatchery Releases. Biology (2022).
4. Comparative Analysis of Genetic Structure and Diversity in Five Populations of Yellowtail Kingfish (Seriola aureovittata). Journal of Marine Science and Engineering (2023).
5. Estimates of Effective Population Size in Commercial and Hatchery Strains of Coho Salmon (Oncorhynchus kisutch (Walbaum, 1792)). Animals (2022).