How do red tides affect shellfish?

Red tides, caused by harmful algal blooms, can produce toxins that accumulate in shellfish, making them unsafe for consumption. When shellfish filter feed on these toxic algae, they absorb the harmful substances, which can lead to shellfish poisoning in humans and marine animals that eat them. This not only poses health risks but also impacts fisheries and local economies reliant on shellfish harvesting. Monitoring and management are crucial to mitigate these effects and protect public health.