Between March and April of each year, the beaches of the Gulf of Santa Clara in Sonora become a crucial stage for the survival of two endangered species: the Gulf Grunion (Leuresthes sardina) and the Red Knot (Calidris canutus roselaari).
The first is an endemic fish whose reproduction depends on these northern Gulf of California shores; the second is a migratory bird that finds its food and rest here before continuing its journey north across the continent.
Based on research conducted since 2010 by Pronatura Noroeste and the Bird Laboratory of the Autonomous University of Baja California Sur, and since the spring of 2022 in collaboration with a group of female environmental advocates from the community, who are known as “Cuidando al Playero rojizo y al Pejerrey¨ (Caring for the Red Knot and the Gulf Grunion), we have been working on the conservation of both species.
The most important work is the delimitation of incubation zones for the Gulf Grunion, as this fish requires up to 10 days for its development and needs special care and human intervention to complete its life cycle. Without the proper delimitation of incubation areas, vehicular traffic can damage the reproductive sites by either crushing the eggs or displacing them to the surface; in both scenarios, egg development is halted, preventing thousands of new fish to be incorporated into the current population.
The role of the Gulf Grunion in the trophic chain is important, because it is part of other species’ diet, such as the Totoaba, which is also in danger of extinction according to data from the Mexico government. On the other hand, the Pacific Red Knot, along with other shorebird species like the Western Sandpiper and the Sanderling, relies on these tiny Gulf Grunion eggs to replenish energy during its long migratory journey.
This phenomenon, which has occurred for centuries, is a clear example of how nature has developed an ecological balance.
Protecting spawning areas ensures that these birds have sufficient food without harming populations, as they also play a role in regulating and maintaining natural equilibrium.
Your help is essential, and you can take part
This upcoming Sunday, March 16,2025, starting at 8:00 a.m., the installation of a temporary enclosure will take place to protect the Gulf Grunion’s incubation zones.
People near to the Gulf of Santa Clara will be able to join this conservation effort and be part of the change. No prior experience is required, just the willingness to contribute to the protection of the coastal ecosystem.
Additionally, visitors can learn more about this initiative and the importance of these species at the Knowledge Module, which will be available in the main beach’s ramada area every weekend until May 11.
People who wish to join the volunteer program can contact 653 104 7161 or go visit the Knowledge Module directly.
Translated by: Fernanda Izabal
Reviewed and edited by: Héctor Sánchez
