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Researchers from the Swedish University of Agricultural Sciences have demonstrated that trace amounts of cocaine and its primary breakdown product, benzoylecgonine, can alter the movement and activity of juvenile Atlantic salmon released in Lake Vättern, Sweden’s second‑largest lake. Key Developments Two‑year‑old hatchery‑reared salmon were implanted with devices releasing environmentally realistic concentrations of cocaine or benzoylecgonine; a control group received drug‑free implants. All fish were equipped with acoustic transmitters and released into the south‑west corner of Lake Vättern (≈ 2,000 sq km). Over a two‑month tracking period, drug‑exposed salmon showed heightened activity toward the study’s end. In the final two weeks, cocaine‑exposed fish swam 5 km farther than controls; metabolite‑exposed fish swam 14 km farther – roughly double the distance. Metabolite‑exposed salmon also moved 12 km farther north than unexposed fish, indicating a stronger behavioural impact. Data & Market Impact Average daily movement increase: +5 km (cocaine) and +14 km (benzoylecgonine) compared with control. Spatial expansion represents a ~150‑200% increase in range for metabolite‑exposed fish. Potential ecosystem cost: altered predator‑prey dynamics could affect commercial fisheries valued at several hundred million euros in the region. Why This Matters Salmon that expend more energy traveling farther may experience reduced growth rates, impacting both wild populations and aquaculture operations. Increased exposure to open‑water zones raises predation risk, potentially lowering survival rates and affecting biodiversity. Drug residues entering waterways stem largely from raw sewage overflows, highlighting a gap in current wastewater‑treatment efficacy. Findings underscore a broader, under‑recognized threat: pharmaceutical metabolites can act as ecological stressors comparable to traditional pollutants. Expert Insight Dr Jack Brand emphasizes that the metabolite’s stronger effect suggests risk assessments that ignore degradation products may vastly underestimate environmental harm. Prof Leon Barron of Imperial College London points out the need for field validation, noting that laboratory‑derived behavioural shifts must be corroborated in naturally polluted habitats. Both scientists agree that improved wastewater infrastructure—particularly the reduction of raw sewage discharges—could mitigate exposure, while pharmaceutical manufacturers are urged to develop “green” drugs that break down harmlessly. What Happens Next Regulators may expand monitoring programs to include illicit‑drug metabolites alongside conventional contaminants. Further field studies are likely to assess whether similar behavioural changes occur in other species such as trout and perch. Policy pressure could accelerate the adoption of advanced treatment technologies (e.g., ozonation, activated carbon) capable of removing benzoylecgonine. Pharmaceutical firms might face incentives—or mandates—to design molecules with rapid, benign degradation pathways.

Japan's oyster industry is facing a severe crisis as a mass die-off of oysters in the country's Hiroshima prefecture threatens the livelihoods of local fishermen and the national cuisine. The die-off, which has resulted in up to 90% of oysters dying in some areas, is attributed to a combination of rising sea temperatures and a brutally hot summer last year.The oyster industry in Hiroshima accounts for almost two-thirds of Japan's supply of farmed oysters, producing 89,000 tons of the shellfish in 2023. The industry's struggles have prompted the government to step in with support measures, including five-year government loans at virtually zero interest and access to mutual aid programs for aquaculture businesses.Experts warn that mass die-offs could become more common due to climate change and global warming. 'It's difficult to put the brakes on climate change,' says Kazuhiko Koike, a professor at Hiroshima University. 'But if the rainy season ends early again with little rainfall, and is followed by prolonged high temperatures and hot weather, this could mean that low oxygen levels and food shortages will occur again.'The crisis has significant implications for local businesses and consumers, with oyster's being a popular Japanese dish. 'This is something out of the ordinary,' says Taketoshi Niina, a fishery owner in Kure. 'A lot of those that do survive are in poor condition … they are not of a high enough quality to sell to shops and restaurants.'