Ballast water introduces invasive species and pollutants such as heavy metals and microplastics that disrupt marine ecosystems and food webs (Landrigan et al., 2020);(Kurniawan et al., 2022). These invasions alter biodiversity patterns and ecological functioning, but also generate long-term risks for public health and food security (Kraus, 2023);(Adeniran-Obey & Osagie, 2024). Well-documented cases such as zebra mussels in the Great Lakes and comb jellies in the Black Sea demonstrating significant environmental and economic impacts (Shiganova et al., 2019); (Burlakova et al., 2023).

Invasive species not only reduce biodiversity but also destabilize nutrient cycles and transform habitats. A prominent example is the lionfish invasion in the Atlantic, which has led to marked declines in native fish populations and disrupted trophic dynamics (A et al., 2019); (Mayfield et al., 2021). Such biodiversity erosion diminishes ecosystem resilience, weakening the capacity of marine systems to buffer against climate change impacts and pollution stressors (Gallardo et al., 2024).

Ballast water also acts as a vector for pathogens such as Vibrio cholerae, associated with cholera outbreaks, and for harmful algal blooms (HABs) that contaminate seafood and coastal waters (Yñiguez et al., 2021). Beyond biological threats, chemical pollutants, including microplastics, bioaccumulate in marine organisms, infiltrating the food chain and posing direct risks to human health and food security (Jahromi et al., 2021); (Zendehboudi et al., 2024). As global shipping intensifies, these combined pressures amplify, underscoring the urgency of implementing scalable treatment systems and stricter regulatory enforcement (Dobrucali et al., 2024).

The cumulative ecological and health impacts of ballast water highlight the importance of developing evidence-based strategies that integrate ecological risk assessment with policy and technology innovation (Adraktas, 2024);(Onyena & Nwaogbe, 2024). To provide a structured overview, Table 1 synthesizes key ecological impacts, their underlying causes, and representative references, offering a concise reference point for subsequent analysis.

Ballast water discharge produces significant economic and social consequences by disrupting ecosystem services that support fisheries, aquaculture, and tourism (Gollasch & David, 2019); (Kraus, 2023). Ballast water discharge produces significant economic and social consequences by disrupting ecosystem services that support fisheries, aquaculture, and tourism.

Fisheries and aquaculture are particularly vulnerable to the cascading effects of invasive species and pathogens introduced via ballast water. The collapse of the Black Sea’s anchovy population following the invasion of the comb jelly Mnemiopsis leidyi created severe economic hardship for fishing communities (Knowler, 2005). Similarly, the spread of pathogens such as Cryptocaryon irritans has disrupted aquaculture production, undermining food security and market stability (Giari et al., 2022). Coastal infrastructure also bears high costs: zebra mussel infestations in the Great Lakes have demanded costly recovery and repair interventions (Lower et al., 2024). In addition, tourism and recreational fishing decline when degraded ecosystems deter visitors, reducing local business income and weakening regional economic resilience (Beukering P et al., 2014);(Sukhikh et al., 2019).

The social consequences of ballast water discharge are equally profound, especially in coastal regions where cultural identity and livelihoods are deeply intertwined with native marine species. Invasive organisms displace native stocks, eroding traditional fishing practices, weakening intergenerational knowledge transfer, and threatening cultural heritage. For example, the Mediterranean fisheries disrupted by the comb jelly have not only suffered ecological and economic setbacks but also cultural dislocation for communities whose identities are bound to these fisheries (Zenetos et al., 2010);(Kraus, 2023).

Implementing ballast water management systems requires substantial financial investment, with installation costs estimated between USD 500,000 and USD 5 million per vessel, in addition to significant operational and maintenance expenses (Gerhard et al., 2019);(Hardiyanto et al., 2023). While these upfront costs pose challenges for shipowners, they are outweighed by the long-term savings achieved through avoided ecological damage and infrastructure repair. For example, proactive measures could have significantly reduced the billions spent on recovery and restoration efforts necessitated by the zebra mussel invasion (Gaag M et al., 2016); (Team, 2025). Such cost-benefit framing highlights ballast water management not only as an ecological imperative but also as a financially rational investment.

International frameworks such as the IMO Ballast Water Management Convention introduce additional compliance costs for shipowners, yet they remain critical instruments for averting large-scale ecological disruption and economic loss (Outinen et al., 2024). To balance regulatory stringency with feasibility, governments can deploy supportive measures, such as tax incentives, subsidies, and resource-sharing programs, that lower financial barriers, foster equitable compliance across regions, and accelerate the adoption of cost-effective treatment technologies (Becqué et al., 2018).

The International Maritime Organization’s Ballast Water Management Convention (BWMC) establishes the first binding global framework for regulating ballast water treatment and discharge, requiring vessels to implement exchange and onboard treatment systems to limit invasive species transfer (Global Maritime Transport and Ballast Water Management: Issues and Solutions [Internet, 2015). However, its enforcement varies widely due to institutional and financial disparities among member states (I.M.O., n.d.). The hierarchical structure of international, national, and regional governance frameworks is summarized in Figure 1.

Beyond the BWMC, individual nations and regions have enacted supplementary frameworks tailored to local contexts. For example, the United States enforces the National Invasive Species Act (NISA), which obliges vessels to treat or exchange ballast water, while China has formally aligned with BWMC standards (Verna & Harris, 2016);(Hao, 2020);(Guard, 2023). Regional initiatives, such as those in the Baltic Sea and the Great Lakes, target specific ecological vulnerabilities and complement international obligations. Yet, disparities in enforcement and implementation across jurisdictions expose persistent gaps in global governance, underscoring the importance of harmonized policies and mechanisms for sharing best practices (Jetoo 2018).

Enforcing ballast water regulations remains a persistent challenge, constrained by technical limitations such as the absence of reliable real-time compliance detection and the high costs of advanced monitoring technologies. Effective enforcement requires rigorous inspections and international coordination, which are unevenly implemented. Promising developments include targeted surveillance in high-risk areas and collaborative port programs, both of which have demonstrated early success (Wang et al., 2020);(Bailey et al., 2022). In addition, emerging tools, such as automated monitoring systems and integrated data-sharing platforms, offer pathways to more scalable and transparent compliance regimes (Fournier et al., 2018);(Olaniyi et al., 2024); Melnyk et al. 2025). Strengthening these measures is essential not only to maximize the impact of existing frameworks but also to enhance global trust in regulatory effectiveness.

Ballast water treatment employs a diverse range of approaches, mechanical, chemical, physical, biological, and increasingly integrated systems, to mitigate the risks of invasive species and pathogen transfer. Filtration remains the most widely adopted baseline method and is frequently paired with complementary techniques such as electrolysis, electrochlorination, or UV disinfection. More advanced options, including ozonation, cavitation, deoxygenation, and advanced oxidation processes, provide additional pathways for compliance but present varying levels of cost, operational complexity, and ecological trade-offs (Balaji et al., 2019);(Duan et al., 2023). Treatment choices should be evaluated not only by efficacy but also by scalability and environmental footprint, aligning with SDG sustainability principles. Figure 2 provides a flowchart summarizing these categories of treatment technologies, complementing the detailed comparisons presented in Table 2 and 3.

The ballast water treatment industry is increasingly adopting innovative practices and standards to develop systems that are both efficient and environmentally responsible. Key trends include modular and scalable designs that provide flexibility across vessel types and operational profiles. Best practices emphasize sustainability by integrating energy-efficient designs, minimizing waste, and lowering operational footprints. At the same time, industry-wide collaboration is strengthening standardized guidelines and certification processes, which enhance consistency, reliability, and compliance across diverse treatment technologies (Apetroaei et al., 2018); (Lakshmi et al., 2021).

Case studies of ballast water management highlight not only the strategies and technologies employed, but also the lessons learned that can inform broader adoption. While successful implementations exist, widespread uptake is still constrained by technical challenges, financial burdens, and uneven regulatory enforcement (Wang et al., 2020). Addressing these barriers requires innovation and cooperation, but also analytical reflection on what has worked and why. Capacity building, technological innovation, and regional collaboration remain essential, yet the real value of case studies lies in their transferability and potential to guide scalable, sustainable ballast water practices (Khaskheli et al. 2023).

Ballast water discharge remains a major pathway for invasive species and pathogen spread, imposing significant ecological, economic, and public health costs worldwide. These challenges also hinder progress toward Sustainable Development Goals (SDGs) related to marine conservation, public health, and sustainable economic growth (Lv et al., 2023). Although multiple treatment technologies exist, their adoption remains uneven, depending on vessel type, shipping route, and financial capacity. Addressing these disparities requires ongoing research to develop efficient and eco-friendly treatment systems, alongside stronger global monitoring and compliance mechanisms (Melnyk et al. 2025).

Mechanical filtration and UV treatment remain widely applied but are constrained by water turbidity and maintenance needs. Chemical disinfection provides broad efficacy yet generates toxic by-products requiring careful neutralization. Advanced oxidation processes and nanotechnology demonstrate superior microbial inactivation but remain costly and energy-intensive, limiting scalability. A key contribution of this review is the comparative evidence that hybrid systems, such as filtration combined with UV or electrochlorination, offer higher compliance rates and improved sustainability compared to single-method approaches (Hess-Erga et al., 2019); (Dong et al., 2021).

Policymakers play a critical role in strengthening regulatory frameworks, funding capacity building, and facilitating technology transfer. Effective enforcement requires investment in port inspection capabilities, standardized reporting, and international cooperation to assist low-resource flag states in meeting BWMC requirements (Bailey et al., 2022);(Feng et al., 2023);(Durlik et al., 2024).

Ballast water threatens aquatic ecosystems and economies by introducing non-native species that outcompete native fauna, alter food webs, and disrupt ecosystem services. These invasions cause direct economic losses in fisheries, aquaculture, and tourism, while also imposing long-term costs related to ecosystem restoration and public health measures (McLaughlan & Aldridge, 2013).

Improved ballast water management is essential to mitigate these impacts while supporting broader sustainability objectives. This review integrates technological, regulatory, and socio-economic perspectives to propose measurable SDG-aligned indicators, thereby enabling assessment of progress toward SDG 14 and related targets.

Effective regulations are critical to successful ballast water management, but regulatory alignment and enforcement remain uneven across regions (Olaniyi et al., 2024). We recommend harmonized standards, incentive mechanisms for adoption of hybrid technologies, and the establishment of regional monitoring hubs to support compliance and data sharing (Zreik, 2024).