The Gentle Giant of La Paz: How big are the whale sharks that visit the bay?

The Bay of La Paz, internationally recognized as a natural sanctuary, welcomes its most distinguished visitor each year: the whale shark. The arrival of this marine colossus marks the beginning of a season of wonder and deep respect for nature, solidifying the capital of Baja California Sur as the world's best destination for sighting this species. This natural phenomenon is a privilege that delights locals and visitors alike.

One of the most frequent questions among marine life enthusiasts is about the size of these specimens. It is important to note that the whale shark is, in fact, the largest fish in the world. An adult specimen can reach impressive lengths, averaging between 12 and 14 meters, with extraordinary records approaching 20 or even 22 meters in length.

However, the specimens that choose the Bay of La Paz as their temporary home have particular characteristics. Experts and local guides have consistently observed that the vast majority of whale sharks that enter this protected area are juvenile-sized. This fascinating behavior has led many researchers to describe the bay as a kind of natural "nursery" for the species.

In this sanctuary, young whale sharks find the ideal feeding and protection conditions to grow. Therefore, the typical sizes reported in recent sighting seasons in La Paz are more modest than those of a full-grown adult. The most common specimens measure between 2 and 5 or 6 meters long, dimensions that, although juvenile, are still impressive when swimming alongside them.

Despite the norm in the bay being juveniles, there are historical records that demonstrate the magnificence this species can achieve in La Paz waters. A sighting of a whale shark in the bay has been documented that reached an extraordinary length of approximately 18 meters, a reminder of the immense size these giants can develop and the richness of our waters.

The official season for whale shark sighting and swimming in La Paz is a highly anticipated event that attracts thousands of people. According to local guides, the season extends from November to April. This period coincides with the colder months, when the sea temperature drops and conditions are ideal for the aggregation of these filter feeders.

Although the official season begins in November, whale sharks start making their appearance in the bay as early as October. They remain feeding and growing in these protected waters throughout all the winter months. Once temperatures begin to rise, they undertake their long summer migrations, heading to other biologically important sites, such as the Galapagos Islands.

The impact of this tourist activity in La Paz is of enormous relevance to the local economy. Whale shark observation is a high-demand activity, attracting tens of thousands of visitors from all over the world each season. Official figures estimate that between 30,000 and 45,000 tourists are received, specifically interested in the experience of swimming alongside this noble creature.

This high tourist influx carries a great responsibility for conservation. To ensure the protection of the species and the sustainability of the activity, the bay was officially declared a Refuge Area for the whale shark in 2018. This designation requires that all tourist expeditions operate under a strict set of regulations and best practices.

The commitment to conservation is total and rigorously applied. Boat captains and tour guides are required to have valid permits from the National Commission of Natural Protected Areas (CONANP). Furthermore, they must receive mandatory annual training on safety measures and the proper management of groups in the water.

These sighting rules are clear and aim to minimize stress on the animals. Among the rules, a safety distance of at least 2 meters laterally and 3 meters behind the shark is required. Likewise, the number of boats that can be in the sighting area simultaneously is strictly limited, ensuring a respectful and sustainable experience.