Organotin Compound Contamination in Aquatic Ecosystems

Organotin compounds, a class of organometallic chemicals widely used in antifouling paints, industrial biocides and agricultural agents, have posed significant and persistent threats to marine and freshwater environments. Among these, tributyltin (TBT) is the most notorious for its high toxicity and resistance to degradation. Once released from vessel hulls or industrial effluents, organotins adsorb strongly to sediments, where they accumulate and undergo slow dealkylation to mono- and dibutyltin derivatives. These compounds readily bioaccumulate in benthic organisms, often leading to endocrine disruption and reproductive impairment across a wide range of taxa. Biomonitoring studies using sentinel species, passive samplers and advanced mass-spectrometric techniques have revealed hotspots of contamination in busy ports, harbours and coastal lagoons worldwide. Regulatory measures, including global bans on TBT-based antifouling systems, have led to measurable declines in some regions, yet residual organotins persist in sediments with half-lives of several years. Contemporary research focuses on refining analytical detection limits, elucidating molecular mechanisms of toxicity—especially receptor-mediated pathways—and assessing ecological recovery trajectories. A multidisciplinary approach that integrates fate modelling, ecotoxicological bioassays and sediment remediation strategies is essential to inform management of organotin legacy pollution and to safeguard aquatic ecosystem health on a global scale.

Research from Nature Portfolio

Recent studies have highlighted the molecular basis of imposex development in marine gastropods, demonstrating that variation in Retinoid X receptor (RXR) expression underlies species-specific sensitivity to organotin exposure. Comparative analyses of two caenogastropod species revealed that individuals from polluted sites express markedly higher levels of RXR in reproductive tissues than those from unpolluted areas, whereas levels of Peroxisome proliferator-activated receptor γ (PPARγ) remained unchanged. These findings support a central role for RXR signalling in mediating the pseudohermaphroditic response to tributyltin and offer a potential biomarker for assessing ecological risk in sensitive molluscan populations.

Organotin Compound Contamination in Aquatic Ecosystems publication trend

The graph below shows the total number of articles in organotin compound contamination in aquatic ecosystems across all publications each year (not limited to Nature Index journals).

Technical terms

Organotin compounds: Organometallic chemicals containing tin–carbon bonds, used in antifouling paints and biocides, that persist and bioaccumulate in aquatic systems.

Tributyltin (TBT): A highly toxic organotin derivative formerly used in antifouling paints, known for endocrine-disrupting effects and slow sediment degradation.

Imposex: The irreversible development of male sexual characteristics in female gastropods caused by exposure to organotin compounds.

Retinoid X receptor (RXR): A nuclear receptor that regulates gene transcription and mediates endocrine disruption when activated aberrantly by organotins.

Butyltin degradation index: A ratio-based metric reflecting the relative abundance of mono-, di- and tributyltin species, used to estimate the recency of TBT contamination in sediments.

References

1. Trends in the analysis and monitoring of organotins in the aquatic environment. Trends in Environmental Analytical Chemistry (2015).
2. The ecotoxicology of marine tributyltin (TBT) hotspots: A review. Marine Environmental Research (2022).
3. Butyltin Contamination in Fishing Port Sediments after the Ban of Tributyltin Antifouling Paint: A Case of Qianzhen Fishing Port in Taiwan. Water (2022).
4. RXR Expression in Marine Gastropods with Different Sensitivity to Imposex Development. Scientific Reports (2020).