Aquaculture Genomics · Fish, Shellfish & Deep-Sea Species

Genomic foundations for breeding and stock management.

Aquaculture is India's fastest-growing food sector, and genomics is transforming it: selective breeding for disease resistance and growth, sex-control markers, and stock-structure mapping all need reference genomes and population-scale resequencing. Deep-sea and non-model aquatic species add the hardest assembly challenges — high heterozygosity, large repeat landscapes, and no close reference.

Plan Your Project → Learn the Basics
Reference-grade
aquatic genomes
Disease-resistance & growth GWAS
Sex-marker & stock-structure
analysis
Deep-sea & non-model
expertise
About the Service

Aquaculture Genomics at Nucleome Informatics

Nucleome Informatics supports aquaculture and marine genomics programmes end to end:

  • Chromosome-scale assembly with QC (QV, BUSCO, Merqury, contig N50, per-chromosome status)
  • Haplotype-resolved output where data supports phasing
  • Mitochondrial genome (circularised, annotated) — valuable for barcoding and stock identification
  • Resequencing deliverables: variant calls, population structure (PCA/ADMIXTURE), FST-based stock differentiation, diversity and inbreeding metrics
  • GWAS results with candidate-gene annotation and breeding-marker conversion
  • NCBI submission-ready files and publication-grade methods documentation

Why this approach

  • Parental haplotypes separated
  • HiFi + Hi-C phasing
  • GWAS & stock-structure ready
Learning Path

From first principles to expert-level analysis

New here? Start with Foundations. Planning a study or reviewing results? Jump to Practitioner or Expert. Each level builds on the one before it, so you can read this page as a short course or dip in where you need to.

Start here if you are new to this service — six ideas that explain what it is and why it matters.

LEVEL 1

Why does aquaculture need genomics?

Selective breeding with genomic information accelerates gains for disease resistance, growth, and feed efficiency — traits that decide profitability. Genomics also underpins stock management and traceability.

LEVEL 1

What is a reference genome used for in breeding?

It is the coordinate system for all downstream work: GWAS, marker discovery, imputation arrays, and pan-genome construction. A good reference makes every subsequent project cheaper and better.

LEVEL 1

Why are fish genomes hard to assemble?

Many aquaculture species are highly heterozygous (outbred), some lineages carry ancient whole-genome duplications (e.g. carp), and repeat content is often high. Long reads with haplotype-aware assembly handle all three.

LEVEL 1

What is stock structure?

The genetic differentiation among wild populations — essential knowledge for hatchery management, restocking programmes, and capture fisheries sustainability.

LEVEL 1

What are deep-sea genomes' challenges?

Often extreme heterozygosity, large repeat landscapes, and no close reference species. They need the full long-read stack and honest feasibility scoping.

LEVEL 1

What samples do I provide?

HMW DNA from a reference individual (blood or muscle; aquatic DNA extraction has specific pitfalls we guide you through), plus cohort samples for resequencing.

For scientists planning a project or reading a report: how each step works and how it can mislead.

LEVEL 2

Genome scoping

Genome size, heterozygosity, and ploidy (including lineage-specific duplications) are assessed before sequencing; strategy and data volumes follow.

LEVEL 2

The assembly stack

HiFi (Revio) for accuracy; Hi-C for scaffolding and phasing; ultra-long ONT where repeats demand it; hifiasm/Verkko with haplotype-aware configuration.

LEVEL 2

Population resequencing

Broodstock, breed, and wild-stock panels resequenced against the reference; variant calls feed diversity, structure, and GWAS analyses.

LEVEL 2

Trait genomics

GWAS for disease resistance and production traits via mixed models (GEMMA/GCTA; GAPIT for breeding contexts), integrating challenge-trial or pond-performance phenotypes.

LEVEL 2

Sex-marker workflows

Sex-linked variants and structural variants detected from male/female population resequencing; markers validated for monosex-production integration.

LEVEL 2

Traceability and certification

Genetic stock identification and close-kin analysis support broodstock certification and capture-to-market traceability.

For study design: the decisions that determine whether the data answers your question.

LEVEL 3

Ancient polyploidy in carp lineage

Common carp and goldfish carry an additional whole-genome duplication (4n-derived genomes ~1.6–1.8 Gb) — assembly and GWAS need subgenome-aware strategies (see our plant polyploid methodology, applied to fish).

LEVEL 3

Shrimp genomics specifics

Litopenaeus vannamei genomes are repeat-rich (~2.4 Gb, high repeat content) with sex-determination regions still being characterised; WSSV-resistance GWAS requires challenge-trial phenotyping rigour — we advise on design.

LEVEL 3

Deep-sea adaptation genomics

Assemblies of deep-sea species (e.g. hadal fishes, cephalopods) enable adaptation studies: gene-family expansions, positively selected genes, and structural variants under pressure, cold, and darkness. Feasibility is scoped honestly — these are among the hardest genomes.

LEVEL 3

Breeding programme integration

From GWAS hits to diagnostic markers and custom genotyping arrays (Axiom myDesign; see our SNP Genotyping/GWAS page) — the full discovery-to-selection pipeline under one roof.

LEVEL 3

Hatchery and wild-stock management

Genomic inbreeding monitoring, effective population size estimation, and restocking-genetics guidance for hatchery programmes.

LEVEL 3

Data and submission

NCBI submission-ready assemblies and raw data, with full methods for the description paper.

WSSV
white spot syndrome virus; the major shrimp pathogen.
Stock structure
genetic differentiation among populations of a harvested species.
FST
the fixation index; a measure of population genetic differentiation.
Close-kin analysis
identifying parent–offspring or sibling pairs from genotypes; used for abundance estimation and traceability.
Monosex production
rearing single-sex cohorts via genetic sex control or hybridisation.
Runs of homozygosity
long homozygous tracts indicating inbreeding in broodstock.
The Science

How it works, in two figures

Modern fish genome assemblies (common carp, tilapia, salmonids) used HiFi + Hi-C strategies with haplotype-aware assembly; shrimp genome complexity and WSSV-resistance genomics are active research areas; deep-sea genome assemblies (hadal fishes, cephalopods) are recent landmarks. See references below.

Figure 1 Heterozygosity challenge. schematic
Collapsed heterozygosity Haplotype-resolved assembly Divergent haplotypes merged Heterozygosity confuses assembly No phasing Parental haplotypes separated HiFi + Hi-C phasing GWAS & stock-structure ready
Figure 1 | Heterozygosity challenge. (Illustrative schematic, not sample data.)
Figure 2 Workflow. schematic
Genome scoping HMW DNA HiFi + Hi-C (+ UL-ONT) Haplotype-aware assembly Broodstock resequencing GWAS / stock structure
Figure 2 | Workflow. (Illustrative schematic, not sample data.)
Technology Highlights

Built for the questions you are asking

The platforms, pipelines and standards behind this service.

PacBio HiFi for aquatic genomes

≥99.9% accurate reads resolve the high heterozygosity and repeat content typical of fish and shellfish genomes — the accuracy backbone of modern aquatic assemblies.

Hi-C scaffolding and haplotype phasing

Chromosome-scale scaffolding plus haplotype separation for outbred aquatic species, where heterozygosity is often the dominant assembly challenge.

Ultra-long ONT reads

PromethION reads spanning 50–100+ kb close the largest repeats in large fish genomes (e.g. teleost macrochromosomes, ancient whole-genome duplications in carp lineage).

Disease-resistance GWAS

Mixed-model association for resistance traits (WSSV in shrimp, streptococcal disease in carps and tilapia), with challenge-trial phenotype integration.

Sex-marker discovery

Sex-linked variant and structural-variant detection from population resequencing — the basis of monosex and genetic sex-control programmes.

Stock structure and connectivity

FST, admixture, and close-kin analyses for wild-stock management, hatchery broodstock certification, and capture–aquaculture traceability. ---

Scope Note

What this service does and does not cover

Scope note. Assembly outcomes scale with heterozygosity, repeat content, and lineage-specific polyploidy: compact diploid fish genomes routinely reach reference grade; carp-lineage and shrimp genomes require subgenome-aware and repeat-heavy strategies with per-chromosome status reported honestly. Deep-sea species are among the most challenging assemblies in biology — feasibility and data requirements are scoped honestly at design stage. GWAS results are associations; breeding-marker validation is a separate step.---
Why Nucleome

Service highlights

What you can expect from our team in Hyderabad.

Aquaculture-focused expertise

Carps, shrimp, tilapia, and Indian major carp programmes — not generic "animal genomics".

Deep-sea and non-model capability

The full long-read stack for species with no close reference.

Breeding pipeline integration

From GWAS to diagnostic markers and custom genotyping arrays.

Stock-structure and traceability analyses

Hatchery certification and capture-fisheries management support.

India's aquaculture relevance

Hyderabad-based, at the centre of India's aquaculture research corridor.

NCBI-ready deliverables

Submission-formatted assemblies, annotation, and methods. ---

Questions

Frequently asked, in plain language

From the basics to the finer points of design and interpretation.

basicWhich aquaculture species do you work with?
Fish (carps, tilapia, catfish, salmonids, ornamentals), crustaceans (shrimp), molluscs, and non-model/deep-sea species. If it has DNA, we can scope it.
basicWhat do you need from me?
HMW DNA from a reference individual plus cohort samples for resequencing. Aquatic DNA extraction has specific pitfalls — we provide protocols or accept tissue.
basicCan genomics help my breeding programme?
Yes — reference assembly plus broodstock resequencing enables GWAS for disease resistance and growth, marker-assisted selection, and inbreeding monitoring.
intermediateHow do you handle highly heterozygous fish genomes?
Haplotype-aware long-read assembly (HiFi + Hi-C) separates the parental haplotypes rather than collapsing them — the standard for outbred aquatic species.
intermediateCan you find sex-linked markers for monosex production?
Yes — sex-linked variants and structural variants are detected from male/female population resequencing and validated for breeding integration.
intermediateCan you analyse wild-stock structure?
Yes — FST, admixture, and close-kin analyses for stock management, restocking programmes, and traceability.
advancedHow do you handle carp-lineage whole-genome duplication?
With subgenome-aware assembly and analysis strategies — the same methodology class we apply to polyploid plants, adapted to fish genomes.
advancedCan you assemble deep-sea species genomes?
Yes, with honest feasibility scoping — these are among the hardest genomes (extreme heterozygosity, large repeats, no close reference). The full long-read stack is applied, and per-chromosome status is reported.
advancedCan GWAS hits become breeding markers?
Yes — diagnostic marker conversion and custom Axiom array design (see our SNP Genotyping/GWAS page) complete the discovery-to-selection pipeline.
advancedCan you support WSSV-resistance studies in shrimp?
Yes — GWAS with challenge-trial phenotype integration; we advise on phenotyping rigour, which determines whether resistance loci are detectable.
References

Key literature & resources

Selected sources behind the methods and reference values on this page. Figures labelled "schematic" or "illustrative" are generated for this page, not client data.

  1. Rhie A, et al. Towards complete and error-free genome assemblies of vertebrate genomes (VGP standards). Science. 2021;374(6566):367–373.
  2. Cheng H, et al. Haplotype-resolved de novo assembly with phased assembly graphs (hifiasm). Nature Methods. 2021;18(2):170–175.
  3. Xu P, et al. Common carp genome (Cyprinidae whole-genome duplication context). Nature Communications. 2014;5:5457. (And subsequent chromosome-scale carp assemblies.)
  4. Brawand D, et al. The genomic substrate for adaptive radiation in African cichlid fish (teleost genome evolution framework). Nature. 2014;513(7518):375–381.
  5. Zhang X, et al. The Pacific white shrimp (Litopenaeus vannamei) genome: repeat-rich assembly context. Nature Communications. 2019;10:3561 (and subsequent chromosome-scale assemblies).
  6. Dudchenko O, et al. De novo assembly of the Aedes aegypti genome using Hi-C. Science. 2017;356(6333):92–95.
  7. Simão FA, et al. BUSCO. Bioinformatics. 2015;31(10):1670–1676. (Merqury: Rhie A, et al. Genome Biology. 2020;21(1):245.)
  8. Ceballos FC, et al. Runs of homozygosity: windows into population history and trait architecture. Nature Reviews Genetics. 2018;19(4):220–234. (Stock-structure and close-kin methodology context: Waples RK, et al. Molecular Ecology Resources. 2022.)