An overaccumulation of dinoflagellates causes a red tide, which can contaminate shellfish and make them unfit for human consumption
The Correct Answer and Explanation is:
Correct Answer:
True.
Explanation
Red tides are harmful algal blooms (HABs) caused by the rapid multiplication, or overaccumulation, of certain types of algae, particularly dinoflagellates, in marine or coastal waters. These microscopic organisms are a natural part of the ocean ecosystem, but when conditions such as warm water temperatures, nutrient-rich waters (often from agricultural runoff), and sunlight align, dinoflagellates can grow explosively, leading to a bloom.
One of the most visible signs of a red tide is the discoloration of the water, which can appear reddish-brown or rust-colored due to the high concentration of pigmented dinoflagellates. However, not all red tides are visibly red, and not all algae blooms are toxic.
The danger of red tides lies in the toxins that certain dinoflagellate species produce. These toxins can accumulate in filter-feeding shellfish such as clams, mussels, oysters, and scallops. When humans consume contaminated shellfish, they risk serious illnesses such as Paralytic Shellfish Poisoning (PSP), Neurotoxic Shellfish Poisoning (NSP), or Amnesic Shellfish Poisoning (ASP). Symptoms can range from gastrointestinal issues to more severe neurological problems and, in extreme cases, death.
Because these toxins are not destroyed by cooking or freezing, contaminated shellfish remain dangerous even after preparation. This is why fisheries and public health agencies monitor shellfish beds during red tide events and often issue warnings or closures to prevent harvesting during those times.
In summary, red tides caused by the overgrowth of dinoflagellates can indeed make shellfish unsafe for human consumption. This poses both environmental and economic threats, affecting marine ecosystems, fisheries, and public health. Understanding and monitoring red tide events is crucial for minimizing their harmful impacts.
