Bacterial diagnostics in aquaculture refer to the suite of analytical methods—such as PCR, immunoassays, and culture techniques—used to detect, identify, and quantify pathogenic bacteria affecting fish, crustaceans, and mollusks. This capability is critical for safeguarding animal health, ensuring product safety, and sustaining the rapid expansion of global aquaculture production. The Bacterial Diagnostics in Aquaculture market size was estimated at US$140 million in 2025, and the market forecast projects a compound annual growth rate (CAGR) of approximately 12% from 2026 to 2033, driven by escalating disease outbreaks, tightening regulatory mandates on pathogen monitoring, and accelerated adoption of rapid molecular technologies. Key forces shaping the industry include the shift toward digital‑enabled point‑of‑care testing, stricter bio‑security standards imposed by governments and certification bodies, and intensifying competitive dynamics among diagnostic manufacturers seeking to capture market share through innovative assay platforms. The largest regional market remains Asia‑Pacific, reflecting the concentration of aquaculture farms in China, India, and Southeast Asia, while Latin America is emerging as the fastest‑growing region, propelled by expanding shrimp and salmon sectors in Chile and Brazil.