Prolonged or excessive consumption of fish with high mercury levels can lead to cognitive and developmental issues, impacting learning, memory, and overall neurological function. Methylmercury, the toxic form of mercury that accumulates in fish, is a potent neurotoxin that can harm the nervous system, particularly in developing fetuses, infants, and young children. Mercury in fish is a concern due to its potential adverse health effects on humans.

This biomagnification process results in higher mercury levels in larger fish, making them a potential source of exposure to humans who consume them. When larger predatory fish consume these smaller fish, the mercury accumulates and becomes more concentrated as it moves up the food chain. In aquatic environments, bacteria transform elemental mercury into methylmercury, a highly toxic form that can accumulate in the tissues of fish.Īs smaller fish consume plankton and other organisms, they can take in small amounts of methylmercury. Mercury is a naturally occurring heavy metal that occasionally results from human activities, such as burning fossil fuels, industrial processes, and mining. What is Mercury, and How Does It Get Into Fish? This guide will tell you how fish accumulate mercury, the risks of consuming mercury in fish, and what fish species deserve a place in your diet. Fortunately, a balanced diet can mitigate the risks associated with mercury consumption. Mercury in fish is associated with the decrease of fine motor skills, memory, and attention over time. Though fish and shellfish are an essential component of a healthy diet, it’s best to avoid species high in mercury. As they move through their life cycles, fish obtain mercury from their surroundings and respective diets.

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