Tara A. Spears
“First the tide rushes in/Plants a kiss on the shore…” Ebb Tide
There’s something so beautiful and magical about being next to the ocean. The sandy beaches of Mexico’s Pacific Coast attract people from all over the world to enjoy the soothing whoosh of the waves, wiggling your toes in the warm sand, and letting go of the day-to-day stress of home. If you are a beach enthusiast or ocean lover, you’ve heard about red tide.
While it may sound mysterious or even ominous, red tides are a fascinating natural phenomenon that can have both beautiful and serious impacts on marine environments. The purpose of this article is to educate those that love Jaltemba Bay about the challenges of red tide. The biggest message is to avoid going in the water or consuming local shell fish when red tide is present. As of Saturday, 29 March, all of the Jaltemba Bay beaches are open for swimming as the red tide has moved on.
Doctor Lorena M. Durán-Riveroll, UAN Microbiology Department explains what constitutes Red tides. This phenomenon, also known as harmful algal blooms (HABs), occur when certain species of algae grow rapidly and accumulate in coastal waters. Despite their name, red tides don’t always appear red. They can range in color from brown to green to even purple, depending on the type of algae present. The “red” in red tide comes from the reddish pigments produced by some algal species, which can tint the water when present in high concentrations.
During a HAB, the abundance of these microorganisms becomes so high that sometimes a change in the color of the water surface can be observed, which can be reddish, orange, green or bioluminescent, producing a beautiful nocturnal spectacle. (Lead photo) I have lived here more than 20 years and this is only the second occurrence of red tide I’ve witnessed. The first was in 2023. The most common harbinger of red tide approaching is the landing of dead sea animals on the beach. In the weeks before the actual red tide was visible, in JB, there were dead fish, sea turtle, and eels coming ashore.
In recent decades, there has been an increase in the frequency, duration, distribution, and intensity of HABs worldwide. This has also increased the human poisonings caused by the consumption of fish or shellfish, which, in turn, have consumed these microorganisms. Hypotheses for this increase point to global climate change, the impacts of human activities on coastlines due to the production of goods and services, and the exploitation of coastal resources.
While most people are aware of the factors that create ideal conditions that cause algae bloom, many people are not aware of the human health hazards. Oceanographer and diver, Gabriela Carranza Castillo, explains: “Exposure to red tide toxins can affect humans in several ways: Inhalation: Breathing in toxin-laden air can cause respiratory symptoms like coughing, wheezing, and throat irritation. Skin Contact: Direct contact with contaminated water may cause irritation or rashes.”
“Another danger is ingestion: Eating shellfish contaminated by red tide toxins can lead to foodborne illnesses and gastrointestinal issues. It may also affect blood pressure or cause dizziness. Symptoms typically appear 30 minutes to 3 hours after consumption.” While these symptoms may appear quickly, they typically subside with reduced exposure. If symptoms persist or worsen, seek medical advice.
Some groups are at higher risk of experiencing more severe symptoms from red tide exposure. Due to their developing respiratory systems, children are especially susceptible to inhaling toxins from red tide. Older adults, whose immune systems may be weaker, might have a more challenging time managing the effects of the toxins. Additionally, individuals with respiratory conditions, such as asthma or COPD, may see their symptoms worsen as the toxins irritate their airways and aggravate existing health issues.
Taking simple steps can help reduce your risk of exposure to red tide. Staying informed and following safety measures is important for protecting yourself and your family.
Many people are fascinated by the ocean, enjoying a dip and feel like they are touching eternity. The mesmerizing roll of waves seems to go on forever until it returns to shore… let the ocean stir your heart, inspire your imagination and bring peace to your soul. 
But, remember to respect the power of the ocean and stay out of the water if you see any beach flag color but green.
