**Outer Banks Fish: Mercury Crashing Thyroid Savings?**

By Franklin Everett Shaw

November 3, 2025

The salty air of the Outer Banks, the thrill of the catch, the taste of fresh fish – it’s a way of life for many in Dare County. But beneath the surface of this idyllic coastal existence lurks a silent threat: mercury contamination in our local seafood. We’re not talking about some vague, distant problem; this is about the fish you and your family are eating, and the potential impact on your health, especially your thyroid. It’s time to cut through the noise and get real about mercury in OBX seafood.

Mercury, a neurotoxin, accumulates in fish, and consuming contaminated fish is the primary way humans are exposed. The Outer Banks, with its unique ecosystem, presents specific challenges and opportunities when it comes to understanding and mitigating this risk. This isn’t about scaremongering; it’s about empowering you with the knowledge to make informed choices and protect your health.

Let’s dive into the specifics of mercury levels in popular OBX catches. Bluefish, a local favorite, can be a significant source of mercury, especially larger, older fish. King mackerel, another common catch, also tends to accumulate higher levels. On the other hand, species like flounder and spot generally have lower mercury concentrations. The North Carolina Department of Environmental Quality (NCDEQ) provides some data, but it’s often generalized and doesn’t always reflect the specific conditions of the Outer Banks.

So, what can you do? First, become a savvy consumer. Don’t rely solely on generic guidelines. Ask your local fishmonger or fisherman about the size and origin of the fish. Smaller, younger fish generally have lower mercury levels. Consider investing in a home mercury testing kit. While not as precise as lab analysis, these kits can provide a general indication of mercury levels in your catch.

Here’s a step-by-step guide to using a home mercury testing kit:

1. Purchase a reputable mercury testing kit specifically designed for fish. Look for kits that provide clear instructions and reliable results.
2. Prepare your sample according to the kit’s instructions. This usually involves taking a small sample of the fish muscle.
3. Follow the kit’s instructions carefully to perform the test. This may involve mixing the sample with a reagent and comparing the color change to a chart.
4. Interpret the results based on the kit’s guidelines. Remember that these kits provide an estimate, not a precise measurement.

If you’re concerned about mercury exposure, especially if you’re pregnant, breastfeeding, or feeding children, limit your consumption of high-mercury fish. The EPA and FDA provide guidelines, but these are often broad. A more conservative approach is to limit high-mercury fish to no more than one serving per month.

Now, let’s talk about your thyroid. Mercury is a known endocrine disruptor, meaning it can interfere with the normal function of your thyroid gland. The thyroid is crucial for regulating metabolism, energy levels, and overall health. Mercury can disrupt thyroid hormone production and conversion, leading to hypothyroidism (underactive thyroid).

Here’s where dietary supplementation comes in. Selenium is a trace mineral that plays a vital role in thyroid hormone metabolism and can help protect against mercury toxicity. Studies have shown that selenium can bind to mercury, reducing its harmful effects. Consider supplementing with 200 mcg of selenium daily, especially if you regularly consume fish.

Another crucial nutrient is iodine. Iodine is essential for thyroid hormone production. However, mercury can interfere with iodine uptake by the thyroid. Ensure you’re getting enough iodine through your diet or supplementation. Seaweed, iodized salt, and dairy products are good sources of iodine.

But be careful with iodine supplementation. Too much iodine can also be harmful to the thyroid. Consult with a healthcare professional to determine the appropriate dosage for you.

For those in Dare County who suspect they have high mercury levels, chelation therapy might be an option. Chelation involves using specific medications to bind to mercury and remove it from the body. However, chelation is not without risks and should only be considered under the guidance of a qualified healthcare professional.

Before considering chelation, get your mercury levels tested through a reputable laboratory. A hair analysis or a blood test can provide an accurate assessment of your mercury burden. If your levels are significantly elevated and you’re experiencing symptoms of mercury toxicity, discuss chelation with your doctor.

Here’s a critical pitfall to avoid: self-treating with chelation agents. Over-the-counter chelation products are often ineffective and can even be dangerous. Chelation should only be performed under medical supervision to monitor for potential side effects and ensure proper detoxification.

Another common mistake is relying solely on chelation without addressing the source of mercury exposure. Chelation is a treatment, not a cure. If you continue to consume high-mercury fish, your mercury levels will likely rebound.

The Outer Banks offers a unique opportunity to enjoy fresh, local seafood. But it’s crucial to do so responsibly and with awareness of the potential risks of mercury contamination. By understanding the species-specific mercury levels in OBX waters, following recommended consumption guidelines, and supporting your thyroid health through informed dietary choices and supplementation, you can safely enjoy the bounty of the sea while protecting your well-being. Don’t let fear dictate your choices, but let knowledge guide them.