Reproductive sterility in aquaculture: A review of induction methods and an emerging approach with application to Pacific Northwest finfish species

Xu, Lan; Zhao, Mingli; Ryu, Jun Hyung; Hayman, Edward S.; Fairgrieve, William T.; Zohar, Yonathan; Luckenbach, J. Adam; Wong, Ten‐Tsao

doi:10.1111/raq.12712

Cited by 17 publications

(14 citation statements)

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“…Establishing and stocking in farm exclusion zones and implementing higher biosecurity measures (Thorstad et al, 2008, Xu et al, 2022.…”

Section: Discussionmentioning

confidence: 99%

The potential impact of aquaculture on the genetic diversity and conservation of wild fish in sub‐Saharan Africa

Sanda,

Metcalfe,

Mable

2024

Aquatic Conservation

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An increasing focus on aquaculture using introduced strains or species poses a serious threat to native wild species in sub‐Saharan Africa, yet almost no policies have been enacted or regulations put in place to address this environmental challenge. Aquaculture in these regions has traditionally been conducted on a relatively small scale but is currently expanding rapidly and is projected to continue increasing in the coming decades, with increasing use of genetically improved strains. This expansion is occurring in a region known for its high biodiversity, creating challenges for increasing fish production without damaging wild fish populations. However, few studies have yet assessed the impacts of changes in aquaculture practice on the genetic composition and diversity of wild populations. The use of non‐native improved strains for aquaculture could cause competition, gene introgression when there is interbreeding with native populations or species, displacement of species and possible extinction of the native wild populations. After providing historical context on African aquaculture, this review describes the current methods of fish breeding and genetic improvement programmes for the main species of cultured fishes, focusing on the potential conservation impacts of the use of introduced (and selectively bred) farmed species. Existing aquaculture policies, legislation and regulations regarding the import and farming of fish are then compared across the main fish‐producing countries. We recommend a regional policy framework considering fish introduction, risk analysis and risk management, human resources development and genetic monitoring that could be drafted into the existing policies to strengthen conservation efforts. We conclude by making recommendations for refining existing regulations and for future research aimed at minimizing the impacts of aquaculture on wild fish populations in sub‐Saharan Africa. Aquaculture in this region needs implementation of responsible guidelines to avoid genetic impacts on native populations of high conservation value.

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“…Establishing and stocking in farm exclusion zones and implementing higher biosecurity measures (Thorstad et al, 2008, Xu et al, 2022.…”

Section: Discussionmentioning

confidence: 99%

The potential impact of aquaculture on the genetic diversity and conservation of wild fish in sub‐Saharan Africa

Sanda,

Metcalfe,

Mable

2024

Aquatic Conservation

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“…Genes important for immune response were identified in Atlantic salmon using RNA-Seq (Fu et al, 2022). With catfish, Jin et al (2022) applied the bulk segregant analysis and RNA-Seq (BSR-Seq) to determine genes involved in QTLs important for ESC resistance. Such analysis allowed identification of potential candidate genes for ESC resistance.…”

Section: Genetic and Epigenetic Regulation Of Disease Resistancementioning

confidence: 99%

“…Important performance and production traits for aquaculture include growth rate, feed conversion efficiency, disease resistance, stress tolerance such as low oxygen tolerance, reproductive success, harvestability, and processing yields, among many others ( Gjedrem, 2012 ; Boyd, 2015 ; Abdelrahman et al, 2017 ; Zhong et al, 2017 ; Li et al, 2019 ; Houston et al, 2020 ; Xu et al, 2022 ). Of these traits, disease resistance continues to be the top priority for aquaculture production because disease problems constitute the largest single cause of economic losses in aquaculture ( Mzula et al, 2021 ; Naylor et al, 2021 ).…”

Section: Introductionmentioning

confidence: 99%

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Genetic and epigenetic regulation of growth, reproduction, disease resistance and stress responses in aquaculture

2022

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Major progress has been made with genomic and genetic studies in aquaculture in the last decade. However, research on epigenetic regulation of aquaculture traits is still at an early stage. It is apparent that most, if not all, aquaculture traits are regulated at both genetic and epigenetic levels. This paper reviews recent progress in understanding of genetic and epigenetic regulation of important aquaculture traits such as growth, reproduction, disease resistance, and stress responses. Although it is challenging to make generalized statements, DNA methylation is mostly correlated with down-regulation of gene expression, especially when at promoters and enhancers. As such, methylation of growth factors and their receptors is negatively correlated with growth; hypomethylation of genes important for stress tolerance is correlated with increased stress tolerance; hypomethylation of genes important for male or female sex differentiation leads to sex differentiation into males or females, respectively. It is apparent that environmental regulation of aquaculture traits is mediated at the level of epigenetic regulation, and such environment-induced epigenetic changes appeared to be intergenerationally inherited, but evidences for transgenerational inheritance are still limited.

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“…When inducing triploidy, the aim is to prevent expulsion of the second polar body from recently fertilized eggs by applying various shock treatments (Tiwary et al 2004;Piferrer et al 2009;Xu et al 2023). The methods for triploid induction in fertilized fish eggs include hydrostatic pressure shock, temperature shock, chemical shock (Pandian and Koteeswaran 1998;Maxime 2008;Piferrer et al 2009;Zhou and Gui 2017), and, more obscurely, electrical shock (Teskeredzȋć et al 1993;Wagner 1996;Hassan et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Initial investigations into the production of triploid sunshine bass using temperature shock

Straus,

Abernathy,

Kelly

et al. 2024

N American J Aquac

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ObjectiveThe sunshine bass (female White Bass Morone chrysops × male Striped Bass M. saxatilis) is an important food fish raised in U.S. aquaculture. Spawning is performed by manually stripping and fertilizing White Bass eggs with Striped Bass sperm. Embryos hatch in approximately 48 h. Mature sunshine bass females can become fertile and produce viable eggs, which is problematic in commercial food‐fish production; therefore, triploid fish are desired.MethodsThe present nonreplicated study incorporated three warm and three cold temperature shocks, along with three postfertilization initiation times and three exposure times for each temperature, during initial stages of incubation to induce triploidy. After exposure to temperature shocks, fertilized eggs were incubated in experimental hatching systems. The best performing cold and warm temperatures and times (and an ambient diploid control) were then used to incubate fertilized eggs in a commercial‐scale trial using standard industry practices with a single batch of eggs. Larvae were stocked at about 185,000 larvae/ha (75,000 larvae/acre) in newly filled and fertilized ponds. Fry were sampled weekly and harvested at 30 days.ResultThere were 15 survivors from the pond containing fish derived from cold‐shocked fertilized eggs; these individuals were tested via Coulter Counter, and no triploids were detected. Testing of 50 survivors from the pond containing fish derived from warm‐shocked fertilized eggs indicated that 14% were triploid.ConclusionTherefore, initial trials indicate that warm temperature shock is preferable to cold shock for inducing a greater percentage of triploid sunshine bass.

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Reproductive sterility in aquaculture: A review of induction methods and an emerging approach with application to Pacific Northwest finfish species

Cited by 17 publications

References 252 publications

The potential impact of aquaculture on the genetic diversity and conservation of wild fish in sub‐Saharan Africa

The potential impact of aquaculture on the genetic diversity and conservation of wild fish in sub‐Saharan Africa

Genetic and epigenetic regulation of growth, reproduction, disease resistance and stress responses in aquaculture

Initial investigations into the production of triploid sunshine bass using temperature shock

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