The fish, which were rescued after the Palisades Fire, play an important role in the local ecosystem. After five months of receiving care at the Aquarium of the Pacific and Heal the Bay Aquarium, a group of rescued northern tidewater gobies has returned to the wild in the Santa Monica Mountains.
Biologists rescued the tidewater gobies in January 2025 from one of their few remaining natural habitats in the Topanga Canyon Lagoon after the Palisades Fire consumed their habitat. This effort was a collaborative endeavor involving California State University, Channel Islands (CSUCI), the Resource Conservation District of the Santa Monica Mountains (RCDSMM), the U.S. Fish and Wildlife Service, U.S. Geological Survey and California State Parks. The two aquariums each took in these fish to temporarily house them as runoff from the fire had heavily impacted their habitat in the wild.
The ecological role tidewater gobies serve in their environment is similar to that of a keystone species. Their presence or absence can signal the health of the entire system, including coastal food webs and lagoon habitats. They help regulate the invertebrate population, including mosquito larvae, while serving as prey for native birds and large fish. Tidewater gobies live in small groups spread across many lagoons along the coast. These groups are semi-connected, so if one lagoon becomes unsuitable—such as when debris, ash, and sediment wash in after a wildfire—gobies from nearby lagoons can move in and recolonize once conditions improve. Since there were limited sites nearby for natural recolonization near Topanga Canyon after the Palisades Fire, biologists stepped in to help relocate and reintroduce gobies to support the recovery of local populations.
Although the Topanga Lagoon habitat has been significantly impacted by sedimentation from the fire, sufficient habitat is now available, allowing these hardy fish to be safely returned to their natural habitat. Their return to Topanga Lagoon is significant because it supported the healthiest and most consistently abundant northern tidewater goby population in Los Angeles County until the Palisades Fire broke out. Not only is their return important for their local recovery, but their genetic traits may also be preserved so they can adapt to warmer, more variable conditions. Monitoring to ensure their survival will continue led by the RCDSMM and CSUCI students and faculty.
