Global fishing patterns amplify human exposures to methylmercury

Area of Science:

• Environmental Science
• Public Health
• Marine Biology

Background:

• Global pollution increases methylmercury (MeHg) in seafood, a neurotoxicant.
• Seafood consumption poses risks (MeHg) and benefits (micronutrients).
• Marine fish are a primary source of MeHg exposure for the general population.

Purpose of the Study:

• To investigate the spatial origins and quantities of MeHg extracted from global fisheries.
• To analyze the relationship between fisheries, MeHg accumulation, and nutritional content in seafood.

Main Methods:

• Utilized high-resolution global fisheries catch data.
• Employed an empirically constrained spatial model for seafood MeHg.

Main Results:

• Tropical and subtropical fisheries account for over 70% of extracted MeHg.
• Low-latitude seafood has the lowest beneficial micronutrients (selenium, omega-3s).
• 84-99% of global subsistence fishing populations may exceed MeHg exposure thresholds.

Conclusions:

• Industrial fishing, especially in the tropics, drives global MeHg public health concerns.
• Ocean warming may further deplete essential micronutrients in seafood.
• Urgent need for pollution control and informed fishing choices considering human nutrition.