Marine Biodiversity Conservation and Fisheries Management

Marine biodiversity underpins ecosystem resilience and the provision of food, livelihoods and cultural services for billions of people worldwide. Overexploitation of fish stocks, destructive fishing methods, habitat loss and climate change are driving widespread declines in species richness, abundance and ecosystem function. Effective conservation and management must therefore integrate spatial protection, sustainable harvest and restoration of degraded habitats within a socio-ecological framework. Marine Protected Areas (MPAs), quota systems based on precautionary limits, gear restrictions and ecosystem-based fisheries management seek to balance human use with the maintenance of ecological processes. Complementary tools such as other effective area-based conservation measures (OECMs), adaptive spatial planning and community engagement are vital to achieve both conservation targets and sustainable fisheries. Coordinated global action, underpinned by sound science and robust monitoring, is essential to safeguard marine diversity and ensure resilient ocean systems in the face of rapid environmental change.

Research from Nature Portfolio

Controlled experiments on temperate reef habitats have quantified the ecosystem effects of commercial pot fishing within an established MPA. A four-year density gradient study revealed significant declines in reef-building organisms and target species at high pot densities, allowing the derivation of a sustainable threshold for pot fishing effort. This evidence provides a practical basis for regulating static gear in partially protected areas. Following a permanent ban on bottom trawling in a heavily exploited coastal region, population studies of predatory mantis shrimps showed marked increases in individual size and proportion of large adults, while overall abundance remained unchanged. These findings demonstrate early signs of recovery in benthic communities after removal of a major disturbance, highlighting both the promise and complexity of fishery closures in urbanised seascapes.

Marine Biodiversity Conservation and Fisheries Management publication trend

The graph below shows the total number of articles in marine biodiversity conservation and fisheries management across all publications each year (not limited to Nature Index journals).

Technical terms

Marine Protected Area (MPA): A zoned ocean area restricting human activity to conserve biodiversity and habitats.

Ecosystem-Based Fisheries Management: An integrated approach that considers whole ecosystems, including human communities, when setting harvest rules.

Maximum Sustainable Yield (MSY): The largest catch that can be taken from a stock over an indefinite period under prevailing environmental conditions.

Other Effective area-based Conservation Measures (OECMs): Spatial measures outside MPAs that deliver long-term biodiversity outcomes.

Bottom Trawling: A fishing method dragging weighted nets across the seabed, often causing habitat damage.

Static Fishing Gear: Non-mobile gear such as pots or traps that minimise seabed impact relative to mobile methods.

References

1. Optimal fishing effort benefits fisheries and conservation. Scientific Reports (2021).
2. Trawl ban in a heavily exploited marine environment: Responses in population dynamics of four stomatopod species. Scientific Reports (2018).
3. The future of marine fisheries management and conservation in the United Kingdom: Lessons learnt from over 100 years of biased policy. Marine Policy (2023).
4. Mexico on Track to Protect 30% of Its Marine Area by 2030. Sustainability (2023).
5. Ecosystem Approach to Fisheries Management works—How switching from mobile to static fishing gear improves populations of fished and non‐fished species inside a marine‐protected area. Journal of Applied Ecology (2021).