Molecular Regulation of Growth in Aquaculture: From Genes to Sustainable Production

The global aquaculture industry produces 91 million tons annually, yet achieving sustainable growth optimization remains constrained by incomplete understanding of regulatory system integration, polyploid genomic complexity, and disconnected molecular-environmental approaches. This systematic review synthesizes 180 peer-reviewed articles (1992-2025) from four databases, revealing that growth regulation operates through integrated multi-level networks: the GH-IGF axis, TGF-β/myostatin signaling, and epigenetic mechanisms responding dynamically to environmental inputs. Research acceleration is evident, with 52.2% of studies published during 2020-2025. Whole-genome duplication events created expanded gene repertoires enabling sophisticated regulatory control while presenting breeding challenges in polyploid species. CRISPR-Cas9 myostatin knockout achieves 15-30% growth enhancement, though practical implementation faces regulatory and economic barriers. DNA methylation and microRNAs enable environmental adaptation and transgenerational trait inheritance, offering complementary approaches to conventional breeding. Climate-resilient strain development requires integrating polyploid breeding methodologies, multi-omics phenotyping platforms, and validated epigenetic markers. Sustainable aquaculture intensification through precision genetics demands coordinated infrastructure development, harmonized regulatory frameworks, and international collaboration to address food security while adapting to climate change. This synthesis establishes research priorities bridging molecular mechanisms with practical applications for sustainable production enhancement.